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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<title>Inter Trees</title>
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<main role="main">
<!--Weave of 'Inter Trees' generated by Inweb-->
<div class="breadcrumbs">
<ul class="crumbs"><li><a href="../index.html">Home</a></li><li><a href="../compiler.html">Inter Modules</a></li><li><a href="index.html">bytecode</a></li><li><a href="index.html#2">Chapter 2: Interoperability</a></li><li><b>Inter Trees</b></li></ul></div>
<p class="purpose">To manage tree structures of inter code, and manage the movement of nodes within these trees.</p>
<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>&#167;1. </b></p>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">typedef</span><span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="reserved-syntax">inter_tree</span><span class="plain-syntax"> {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="reserved-syntax">inter_warehouse</span><span class="plain-syntax"> *</span><span class="identifier-syntax">housed</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="reserved-syntax">inter_tree_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">root_node</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="reserved-syntax">inter_package</span><span class="plain-syntax"> *</span><span class="identifier-syntax">root_package</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="identifier-syntax">building_site</span><span class="plain-syntax"> </span><span class="identifier-syntax">site</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">CLASS_DEFINITION</span>
<span class="plain-syntax">} </span><span class="reserved-syntax">inter_tree</span><span class="plain-syntax">;</span>
</pre>
<ul class="endnotetexts"><li>The structure inter_tree is accessed in 2/bkm, 2/st, 2/pck, 2/trn, 3/iibf and here.</li></ul>
<p class="commentary firstcommentary"><a id="SP2" class="paragraph-anchor"></a><b>&#167;2. </b></p>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">inter_tree</span><span class="plain-syntax"> *</span><span class="function-syntax">InterTree::new</span><span class="plain-syntax">(</span><span class="reserved-syntax">void</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">inter_tree</span><span class="plain-syntax"> *</span><span class="identifier-syntax">I</span><span class="plain-syntax"> = </span><span class="identifier-syntax">CREATE</span><span class="plain-syntax">(</span><span class="reserved-syntax">inter_tree</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">I</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">housed</span><span class="plain-syntax"> = </span><a href="2-tw.html#SP3" class="function-link"><span class="function-syntax">Inter::Warehouse::new</span></a><span class="plain-syntax">();</span>
<span class="plain-syntax"> </span><span class="constant-syntax">inter_ti</span><span class="plain-syntax"> </span><span class="identifier-syntax">N</span><span class="plain-syntax"> = </span><a href="2-tw.html#SP3" class="function-link"><span class="function-syntax">Inter::Warehouse::create_symbols_table</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">housed</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">inter_symbols_table</span><span class="plain-syntax"> *</span><span class="identifier-syntax">globals</span><span class="plain-syntax"> = </span><a href="2-tw.html#SP3" class="function-link"><span class="function-syntax">Inter::Warehouse::get_symbols_table</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">housed</span><span class="plain-syntax">, </span><span class="identifier-syntax">N</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="constant-syntax">inter_ti</span><span class="plain-syntax"> </span><span class="identifier-syntax">root_package_ID</span><span class="plain-syntax"> = </span><a href="2-tw.html#SP3" class="function-link"><span class="function-syntax">Inter::Warehouse::create_package</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">housed</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">I</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">root_package</span><span class="plain-syntax"> = </span><a href="2-tw.html#SP3" class="function-link"><span class="function-syntax">Inter::Warehouse::get_package</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">housed</span><span class="plain-syntax">, </span><span class="identifier-syntax">root_package_ID</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">I</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">root_node</span><span class="plain-syntax"> = </span><a href="2-in.html#SP4" class="function-link"><span class="function-syntax">Inode::root_frame</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">housed</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">I</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">root_package</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">package_head</span><span class="plain-syntax"> = </span><span class="identifier-syntax">I</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">root_node</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><a href="2-pck.html#SP3" class="function-link"><span class="function-syntax">Inter::Packages::make_rootlike</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">root_package</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><a href="2-pck.html#SP3" class="function-link"><span class="function-syntax">Inter::Packages::set_scope</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">root_package</span><span class="plain-syntax">, </span><span class="identifier-syntax">globals</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">I</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">root_node</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">package</span><span class="plain-syntax"> = </span><span class="identifier-syntax">I</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">root_package</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><a href="2-tw.html#SP3" class="function-link"><span class="function-syntax">Inter::Warehouse::attribute_resource</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">housed</span><span class="plain-syntax">, </span><span class="identifier-syntax">N</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">root_package</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">Site::clear</span><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">I</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
<span class="reserved-syntax">inter_package</span><span class="plain-syntax"> *</span><span class="function-syntax">InterTree::root_package</span><button class="popup" onclick="togglePopup('usagePopup1')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup1">Usage of <span class="code-font"><span class="function-syntax">InterTree::root_package</span></span>:<br/>Definition - <a href="3-dfn.html#SP3">&#167;3</a><br/>Inter in Binary Files - <a href="3-iibf.html#SP1_4">&#167;1.4</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">inter_tree</span><span class="plain-syntax"> *</span><span class="identifier-syntax">I</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">I</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">I</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">root_package</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
<span class="reserved-syntax">inter_warehouse</span><span class="plain-syntax"> *</span><span class="function-syntax">InterTree::warehouse</span><button class="popup" onclick="togglePopup('usagePopup2')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup2">Usage of <span class="code-font"><span class="function-syntax">InterTree::warehouse</span></span>:<br/>Bookmarks - <a href="2-bkm.html#SP1">&#167;1</a><br/>Inter Nodes - <a href="2-in.html#SP4">&#167;4</a><br/>Symbols - <a href="2-sym.html#SP4">&#167;4</a><br/>Definition - <a href="3-dfn.html#SP3">&#167;3</a><br/>Inter in Binary Files - <a href="3-iibf.html#SP1">&#167;1</a>, <a href="3-iibf.html#SP1_1">&#167;1.1</a><br/>Inter Data Types - <a href="3-idt.html#SP3">&#167;3</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">inter_tree</span><span class="plain-syntax"> *</span><span class="identifier-syntax">I</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">I</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">housed</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
<span class="reserved-syntax">inter_symbols_table</span><span class="plain-syntax"> *</span><span class="function-syntax">InterTree::global_scope</span><button class="popup" onclick="togglePopup('usagePopup3')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup3">Usage of <span class="code-font"><span class="function-syntax">InterTree::global_scope</span></span>:<br/>Bookmarks - <a href="2-bkm.html#SP1">&#167;1</a><br/>Inter Nodes - <a href="2-in.html#SP3">&#167;3</a><br/>Symbols Tables - <a href="2-st.html#SP8">&#167;8</a>, <a href="2-st.html#SP9">&#167;9</a>, <a href="2-st.html#SP11">&#167;11</a><br/>Transmigration - <a href="2-trn.html#SP3">&#167;3</a>, <a href="2-trn.html#SP3_1">&#167;3.1</a>, <a href="2-trn.html#SP3_1_1">&#167;3.1.1</a>, <a href="2-trn.html#SP3_2">&#167;3.2</a>, <a href="2-trn.html#SP3_2_1">&#167;3.2.1</a><br/>Inter in Binary Files - <a href="3-iibf.html#SP1_4">&#167;1.4</a><br/>The Package Construct - <a href="4-tpc3.html#SP2">&#167;2</a><br/>The Inv Construct - <a href="5-tic.html#SP2">&#167;2</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">inter_tree</span><span class="plain-syntax"> *</span><span class="identifier-syntax">I</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><a href="2-pck.html#SP3" class="function-link"><span class="function-syntax">Inter::Packages::scope</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">root_package</span><span class="plain-syntax">);</span>
<span class="plain-syntax">}</span>
<span class="reserved-syntax">inter_tree_node</span><span class="plain-syntax"> *</span><span class="function-syntax">InterTree::previous</span><button class="popup" onclick="togglePopup('usagePopup4')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup4">Usage of <span class="code-font"><span class="function-syntax">InterTree::previous</span></span>:<br/><a href="2-it.html#SP3_1">&#167;3.1</a>, <a href="2-it.html#SP3_5">&#167;3.5</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">inter_tree_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">F</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">F</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">F</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">previous_itn</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
<span class="reserved-syntax">inter_tree_node</span><span class="plain-syntax"> *</span><span class="function-syntax">InterTree::next</span><button class="popup" onclick="togglePopup('usagePopup5')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup5">Usage of <span class="code-font"><span class="function-syntax">InterTree::next</span></span>:<br/><a href="2-it.html#SP3_1">&#167;3.1</a>, <a href="2-it.html#SP3_4">&#167;3.4</a>, <a href="2-it.html#SP5">&#167;5</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">inter_tree_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">F</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">F</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">F</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">next_itn</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
<span class="reserved-syntax">inter_tree_node</span><span class="plain-syntax"> *</span><span class="function-syntax">InterTree::first_child</span><button class="popup" onclick="togglePopup('usagePopup6')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup6">Usage of <span class="code-font"><span class="function-syntax">InterTree::first_child</span></span>:<br/><a href="2-it.html#SP3_1">&#167;3.1</a>, <a href="2-it.html#SP3_2">&#167;3.2</a>, <a href="2-it.html#SP3_5">&#167;3.5</a>, <a href="2-it.html#SP5">&#167;5</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">inter_tree_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">F</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">F</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">F</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">first_child_itn</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
<span class="reserved-syntax">inter_tree_node</span><span class="plain-syntax"> *</span><span class="function-syntax">InterTree::second_child</span><span class="plain-syntax">(</span><span class="reserved-syntax">inter_tree_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">P</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">P</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">P</span><span class="plain-syntax"> = </span><span class="identifier-syntax">P</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">first_child_itn</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">P</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">P</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">next_itn</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
<span class="reserved-syntax">inter_tree_node</span><span class="plain-syntax"> *</span><span class="function-syntax">InterTree::third_child</span><span class="plain-syntax">(</span><span class="reserved-syntax">inter_tree_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">P</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">P</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">P</span><span class="plain-syntax"> = </span><span class="identifier-syntax">P</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">first_child_itn</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">P</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">P</span><span class="plain-syntax"> = </span><span class="identifier-syntax">P</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">next_itn</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">P</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">P</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">next_itn</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
<span class="reserved-syntax">inter_tree_node</span><span class="plain-syntax"> *</span><span class="function-syntax">InterTree::fourth_child</span><span class="plain-syntax">(</span><span class="reserved-syntax">inter_tree_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">P</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">P</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">P</span><span class="plain-syntax"> = </span><span class="identifier-syntax">P</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">first_child_itn</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">P</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">P</span><span class="plain-syntax"> = </span><span class="identifier-syntax">P</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">next_itn</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">P</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">P</span><span class="plain-syntax"> = </span><span class="identifier-syntax">P</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">next_itn</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">P</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">P</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">next_itn</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
<span class="reserved-syntax">inter_tree_node</span><span class="plain-syntax"> *</span><span class="function-syntax">InterTree::fifth_child</span><span class="plain-syntax">(</span><span class="reserved-syntax">inter_tree_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">P</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">P</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">P</span><span class="plain-syntax"> = </span><span class="identifier-syntax">P</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">first_child_itn</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">P</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">P</span><span class="plain-syntax"> = </span><span class="identifier-syntax">P</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">next_itn</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">P</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">P</span><span class="plain-syntax"> = </span><span class="identifier-syntax">P</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">next_itn</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">P</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">P</span><span class="plain-syntax"> = </span><span class="identifier-syntax">P</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">next_itn</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">P</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">P</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">next_itn</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
<span class="reserved-syntax">inter_tree_node</span><span class="plain-syntax"> *</span><span class="function-syntax">InterTree::sixth_child</span><span class="plain-syntax">(</span><span class="reserved-syntax">inter_tree_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">P</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">P</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">P</span><span class="plain-syntax"> = </span><span class="identifier-syntax">P</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">first_child_itn</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">P</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">P</span><span class="plain-syntax"> = </span><span class="identifier-syntax">P</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">next_itn</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">P</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">P</span><span class="plain-syntax"> = </span><span class="identifier-syntax">P</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">next_itn</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">P</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">P</span><span class="plain-syntax"> = </span><span class="identifier-syntax">P</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">next_itn</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">P</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">P</span><span class="plain-syntax"> = </span><span class="identifier-syntax">P</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">next_itn</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">P</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">P</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">next_itn</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
<span class="reserved-syntax">inter_tree_node</span><span class="plain-syntax"> *</span><span class="function-syntax">InterTree::last_child</span><button class="popup" onclick="togglePopup('usagePopup7')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup7">Usage of <span class="code-font"><span class="function-syntax">InterTree::last_child</span></span>:<br/><a href="2-it.html#SP3_1">&#167;3.1</a>, <a href="2-it.html#SP3_3">&#167;3.3</a>, <a href="2-it.html#SP3_4">&#167;3.4</a><br/>Bookmarks - <a href="2-bkm.html#SP1">&#167;1</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">inter_tree_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">F</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">F</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">F</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">last_child_itn</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
<span class="reserved-syntax">inter_tree_node</span><span class="plain-syntax"> *</span><span class="function-syntax">InterTree::parent</span><button class="popup" onclick="togglePopup('usagePopup8')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup8">Usage of <span class="code-font"><span class="function-syntax">InterTree::parent</span></span>:<br/><a href="2-it.html#SP3_1">&#167;3.1</a>, <a href="2-it.html#SP3_4">&#167;3.4</a>, <a href="2-it.html#SP3_5">&#167;3.5</a><br/>Bookmarks - <a href="2-bkm.html#SP1">&#167;1</a><br/>Inter Nodes - <a href="2-in.html#SP6">&#167;6</a><br/>Packages - <a href="2-pck.html#SP3">&#167;3</a><br/>Inter Errors - <a href="3-ie.html#SP2">&#167;2</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">inter_tree_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">F</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">F</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">F</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">parent_itn</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
</pre>
<p class="commentary firstcommentary"><a id="SP3" class="paragraph-anchor"></a><b>&#167;3. </b></p>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">InterTree::remove_node</span><button class="popup" onclick="togglePopup('usagePopup9')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup9">Usage of <span class="code-font"><span class="function-syntax">InterTree::remove_node</span></span>:<br/>Symbols - <a href="2-sym.html#SP4">&#167;4</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">inter_tree_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">P</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><a href="2-it.html#SP3" class="function-link"><span class="function-syntax">InterTree::place</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">P</span><span class="plain-syntax">, </span><span class="constant-syntax">NOWHERE_ICPLACEMENT</span><span class="plain-syntax">, </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">);</span>
<span class="plain-syntax">}</span>
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">InterTree::place</span><button class="popup" onclick="togglePopup('usagePopup10')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup10">Usage of <span class="code-font"><span class="function-syntax">InterTree::place</span></span>:<br/>Bookmarks - <a href="2-bkm.html#SP1">&#167;1</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">inter_tree_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">C</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">how</span><span class="plain-syntax">, </span><span class="reserved-syntax">inter_tree_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">R</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="2-it.html#SP3_1" class="named-paragraph-link"><span class="named-paragraph">Extricate C from its current tree position</span><span class="named-paragraph-number">3.1</span></a></span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">switch</span><span class="plain-syntax"> (</span><span class="identifier-syntax">how</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="identifier-syntax">NOWHERE_ICPLACEMENT:</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="identifier-syntax">AS_FIRST_CHILD_OF_ICPLACEMENT:</span>
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="2-it.html#SP3_2" class="named-paragraph-link"><span class="named-paragraph">Make C the first child of R</span><span class="named-paragraph-number">3.2</span></a></span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="identifier-syntax">AS_LAST_CHILD_OF_ICPLACEMENT:</span>
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="2-it.html#SP3_3" class="named-paragraph-link"><span class="named-paragraph">Make C the last child of R</span><span class="named-paragraph-number">3.3</span></a></span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="identifier-syntax">AFTER_ICPLACEMENT:</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="identifier-syntax">IMMEDIATELY_AFTER_ICPLACEMENT:</span>
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="2-it.html#SP3_4" class="named-paragraph-link"><span class="named-paragraph">Insert C after R</span><span class="named-paragraph-number">3.4</span></a></span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="identifier-syntax">BEFORE_ICPLACEMENT:</span>
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="2-it.html#SP3_5" class="named-paragraph-link"><span class="named-paragraph">Insert C before R</span><span class="named-paragraph-number">3.5</span></a></span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">default:</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"unimplemented"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> }</span>
<span class="plain-syntax">}</span>
</pre>
<p class="commentary firstcommentary"><a id="SP3_1" class="paragraph-anchor"></a><b>&#167;3.1. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Extricate C from its current tree position</span><span class="named-paragraph-number">3.1</span></span><span class="comment-syntax"> =</span>
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="plain-syntax"> </span><span class="reserved-syntax">inter_tree_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">OP</span><span class="plain-syntax"> = </span><a href="2-it.html#SP2" class="function-link"><span class="function-syntax">InterTree::parent</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">C</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">OP</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><a href="2-it.html#SP2" class="function-link"><span class="function-syntax">InterTree::first_child</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">OP</span><span class="plain-syntax">) == </span><span class="identifier-syntax">C</span><span class="plain-syntax">)</span>
<span class="plain-syntax"> </span><a href="2-it.html#SP4" class="function-link"><span class="function-syntax">InterTree::set_first_child_UNSAFE</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">OP</span><span class="plain-syntax">, </span><a href="2-it.html#SP2" class="function-link"><span class="function-syntax">InterTree::next</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">C</span><span class="plain-syntax">));</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><a href="2-it.html#SP2" class="function-link"><span class="function-syntax">InterTree::last_child</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">OP</span><span class="plain-syntax">) == </span><span class="identifier-syntax">C</span><span class="plain-syntax">)</span>
<span class="plain-syntax"> </span><a href="2-it.html#SP4" class="function-link"><span class="function-syntax">InterTree::set_last_child_UNSAFE</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">OP</span><span class="plain-syntax">, </span><a href="2-it.html#SP2" class="function-link"><span class="function-syntax">InterTree::previous</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">C</span><span class="plain-syntax">));</span>
<span class="plain-syntax"> }</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">inter_tree_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">OB</span><span class="plain-syntax"> = </span><a href="2-it.html#SP2" class="function-link"><span class="function-syntax">InterTree::previous</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">C</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">inter_tree_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">OD</span><span class="plain-syntax"> = </span><a href="2-it.html#SP2" class="function-link"><span class="function-syntax">InterTree::next</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">C</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">OB</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><a href="2-it.html#SP4" class="function-link"><span class="function-syntax">InterTree::set_next_UNSAFE</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">OB</span><span class="plain-syntax">, </span><span class="identifier-syntax">OD</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> }</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">OD</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><a href="2-it.html#SP4" class="function-link"><span class="function-syntax">InterTree::set_previous_UNSAFE</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">OD</span><span class="plain-syntax">, </span><span class="identifier-syntax">OB</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> }</span>
<span class="plain-syntax"> </span><a href="2-it.html#SP4" class="function-link"><span class="function-syntax">InterTree::set_parent_UNSAFE</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">C</span><span class="plain-syntax">, </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><a href="2-it.html#SP4" class="function-link"><span class="function-syntax">InterTree::set_previous_UNSAFE</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">C</span><span class="plain-syntax">, </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><a href="2-it.html#SP4" class="function-link"><span class="function-syntax">InterTree::set_next_UNSAFE</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">C</span><span class="plain-syntax">, </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">);</span>
</pre>
<ul class="endnotetexts"><li>This code is used in <a href="2-it.html#SP3">&#167;3</a>.</li></ul>
<p class="commentary firstcommentary"><a id="SP3_2" class="paragraph-anchor"></a><b>&#167;3.2. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Make C the first child of R</span><span class="named-paragraph-number">3.2</span></span><span class="comment-syntax"> =</span>
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="plain-syntax"> </span><a href="2-it.html#SP4" class="function-link"><span class="function-syntax">InterTree::set_parent_UNSAFE</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">C</span><span class="plain-syntax">, </span><span class="identifier-syntax">R</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">inter_tree_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">D</span><span class="plain-syntax"> = </span><a href="2-it.html#SP2" class="function-link"><span class="function-syntax">InterTree::first_child</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">R</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">D</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><a href="2-it.html#SP4" class="function-link"><span class="function-syntax">InterTree::set_last_child_UNSAFE</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">R</span><span class="plain-syntax">, </span><span class="identifier-syntax">C</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><a href="2-it.html#SP4" class="function-link"><span class="function-syntax">InterTree::set_next_UNSAFE</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">C</span><span class="plain-syntax">, </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> } </span><span class="reserved-syntax">else</span><span class="plain-syntax"> {</span>
<span class="plain-syntax"> </span><a href="2-it.html#SP4" class="function-link"><span class="function-syntax">InterTree::set_previous_UNSAFE</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">D</span><span class="plain-syntax">, </span><span class="identifier-syntax">C</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><a href="2-it.html#SP4" class="function-link"><span class="function-syntax">InterTree::set_next_UNSAFE</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">C</span><span class="plain-syntax">, </span><span class="identifier-syntax">D</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> }</span>
<span class="plain-syntax"> </span><a href="2-it.html#SP4" class="function-link"><span class="function-syntax">InterTree::set_first_child_UNSAFE</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">R</span><span class="plain-syntax">, </span><span class="identifier-syntax">C</span><span class="plain-syntax">);</span>
</pre>
<ul class="endnotetexts"><li>This code is used in <a href="2-it.html#SP3">&#167;3</a>.</li></ul>
<p class="commentary firstcommentary"><a id="SP3_3" class="paragraph-anchor"></a><b>&#167;3.3. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Make C the last child of R</span><span class="named-paragraph-number">3.3</span></span><span class="comment-syntax"> =</span>
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="plain-syntax"> </span><a href="2-it.html#SP4" class="function-link"><span class="function-syntax">InterTree::set_parent_UNSAFE</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">C</span><span class="plain-syntax">, </span><span class="identifier-syntax">R</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">inter_tree_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">B</span><span class="plain-syntax"> = </span><a href="2-it.html#SP2" class="function-link"><span class="function-syntax">InterTree::last_child</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">R</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">B</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><a href="2-it.html#SP4" class="function-link"><span class="function-syntax">InterTree::set_first_child_UNSAFE</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">R</span><span class="plain-syntax">, </span><span class="identifier-syntax">C</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><a href="2-it.html#SP4" class="function-link"><span class="function-syntax">InterTree::set_previous_UNSAFE</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">C</span><span class="plain-syntax">, </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> } </span><span class="reserved-syntax">else</span><span class="plain-syntax"> {</span>
<span class="plain-syntax"> </span><a href="2-it.html#SP4" class="function-link"><span class="function-syntax">InterTree::set_next_UNSAFE</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">B</span><span class="plain-syntax">, </span><span class="identifier-syntax">C</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><a href="2-it.html#SP4" class="function-link"><span class="function-syntax">InterTree::set_previous_UNSAFE</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">C</span><span class="plain-syntax">, </span><span class="identifier-syntax">B</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> }</span>
<span class="plain-syntax"> </span><a href="2-it.html#SP4" class="function-link"><span class="function-syntax">InterTree::set_last_child_UNSAFE</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">R</span><span class="plain-syntax">, </span><span class="identifier-syntax">C</span><span class="plain-syntax">);</span>
</pre>
<ul class="endnotetexts"><li>This code is used in <a href="2-it.html#SP3">&#167;3</a>.</li></ul>
<p class="commentary firstcommentary"><a id="SP3_4" class="paragraph-anchor"></a><b>&#167;3.4. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Insert C after R</span><span class="named-paragraph-number">3.4</span></span><span class="comment-syntax"> =</span>
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="plain-syntax"> </span><span class="reserved-syntax">inter_tree_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">P</span><span class="plain-syntax"> = </span><a href="2-it.html#SP2" class="function-link"><span class="function-syntax">InterTree::parent</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">R</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">P</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="identifier-syntax">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"can't move C before R when R is nowhere"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><a href="2-it.html#SP4" class="function-link"><span class="function-syntax">InterTree::set_parent_UNSAFE</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">C</span><span class="plain-syntax">, </span><span class="identifier-syntax">P</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><a href="2-it.html#SP2" class="function-link"><span class="function-syntax">InterTree::last_child</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">P</span><span class="plain-syntax">) == </span><span class="identifier-syntax">R</span><span class="plain-syntax">)</span>
<span class="plain-syntax"> </span><a href="2-it.html#SP4" class="function-link"><span class="function-syntax">InterTree::set_last_child_UNSAFE</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">P</span><span class="plain-syntax">, </span><span class="identifier-syntax">C</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">else</span><span class="plain-syntax"> {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">inter_tree_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">D</span><span class="plain-syntax"> = </span><a href="2-it.html#SP2" class="function-link"><span class="function-syntax">InterTree::next</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">R</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">D</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="identifier-syntax">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"inter tree broken"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><a href="2-it.html#SP4" class="function-link"><span class="function-syntax">InterTree::set_next_UNSAFE</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">C</span><span class="plain-syntax">, </span><span class="identifier-syntax">D</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><a href="2-it.html#SP4" class="function-link"><span class="function-syntax">InterTree::set_previous_UNSAFE</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">D</span><span class="plain-syntax">, </span><span class="identifier-syntax">C</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> }</span>
<span class="plain-syntax"> </span><a href="2-it.html#SP4" class="function-link"><span class="function-syntax">InterTree::set_next_UNSAFE</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">R</span><span class="plain-syntax">, </span><span class="identifier-syntax">C</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><a href="2-it.html#SP4" class="function-link"><span class="function-syntax">InterTree::set_previous_UNSAFE</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">C</span><span class="plain-syntax">, </span><span class="identifier-syntax">R</span><span class="plain-syntax">);</span>
</pre>
<ul class="endnotetexts"><li>This code is used in <a href="2-it.html#SP3">&#167;3</a>.</li></ul>
<p class="commentary firstcommentary"><a id="SP3_5" class="paragraph-anchor"></a><b>&#167;3.5. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Insert C before R</span><span class="named-paragraph-number">3.5</span></span><span class="comment-syntax"> =</span>
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="plain-syntax"> </span><span class="reserved-syntax">inter_tree_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">P</span><span class="plain-syntax"> = </span><a href="2-it.html#SP2" class="function-link"><span class="function-syntax">InterTree::parent</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">R</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">P</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="identifier-syntax">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"can't move C before R when R is nowhere"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><a href="2-it.html#SP4" class="function-link"><span class="function-syntax">InterTree::set_parent_UNSAFE</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">C</span><span class="plain-syntax">, </span><span class="identifier-syntax">P</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><a href="2-it.html#SP2" class="function-link"><span class="function-syntax">InterTree::first_child</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">P</span><span class="plain-syntax">) == </span><span class="identifier-syntax">R</span><span class="plain-syntax">)</span>
<span class="plain-syntax"> </span><a href="2-it.html#SP4" class="function-link"><span class="function-syntax">InterTree::set_first_child_UNSAFE</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">P</span><span class="plain-syntax">, </span><span class="identifier-syntax">C</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">else</span><span class="plain-syntax"> {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">inter_tree_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">B</span><span class="plain-syntax"> = </span><a href="2-it.html#SP2" class="function-link"><span class="function-syntax">InterTree::previous</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">R</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">B</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="identifier-syntax">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"inter tree broken"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><a href="2-it.html#SP4" class="function-link"><span class="function-syntax">InterTree::set_previous_UNSAFE</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">C</span><span class="plain-syntax">, </span><span class="identifier-syntax">B</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><a href="2-it.html#SP4" class="function-link"><span class="function-syntax">InterTree::set_next_UNSAFE</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">B</span><span class="plain-syntax">, </span><span class="identifier-syntax">C</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> }</span>
<span class="plain-syntax"> </span><a href="2-it.html#SP4" class="function-link"><span class="function-syntax">InterTree::set_next_UNSAFE</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">C</span><span class="plain-syntax">, </span><span class="identifier-syntax">R</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><a href="2-it.html#SP4" class="function-link"><span class="function-syntax">InterTree::set_previous_UNSAFE</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">R</span><span class="plain-syntax">, </span><span class="identifier-syntax">C</span><span class="plain-syntax">);</span>
</pre>
<ul class="endnotetexts"><li>This code is used in <a href="2-it.html#SP3">&#167;3</a>.</li></ul>
<p class="commentary firstcommentary"><a id="SP4" class="paragraph-anchor"></a><b>&#167;4. </b></p>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">InterTree::set_previous_UNSAFE</span><button class="popup" onclick="togglePopup('usagePopup11')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup11">Usage of <span class="code-font"><span class="function-syntax">InterTree::set_previous_UNSAFE</span></span>:<br/><a href="2-it.html#SP3_1">&#167;3.1</a>, <a href="2-it.html#SP3_2">&#167;3.2</a>, <a href="2-it.html#SP3_3">&#167;3.3</a>, <a href="2-it.html#SP3_4">&#167;3.4</a>, <a href="2-it.html#SP3_5">&#167;3.5</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">inter_tree_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">F</span><span class="plain-syntax">, </span><span class="reserved-syntax">inter_tree_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">V</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">F</span><span class="plain-syntax">) </span><span class="identifier-syntax">F</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">previous_itn</span><span class="plain-syntax"> = </span><span class="identifier-syntax">V</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">InterTree::set_next_UNSAFE</span><button class="popup" onclick="togglePopup('usagePopup12')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup12">Usage of <span class="code-font"><span class="function-syntax">InterTree::set_next_UNSAFE</span></span>:<br/><a href="2-it.html#SP3_1">&#167;3.1</a>, <a href="2-it.html#SP3_2">&#167;3.2</a>, <a href="2-it.html#SP3_3">&#167;3.3</a>, <a href="2-it.html#SP3_4">&#167;3.4</a>, <a href="2-it.html#SP3_5">&#167;3.5</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">inter_tree_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">F</span><span class="plain-syntax">, </span><span class="reserved-syntax">inter_tree_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">V</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">F</span><span class="plain-syntax">) </span><span class="identifier-syntax">F</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">next_itn</span><span class="plain-syntax"> = </span><span class="identifier-syntax">V</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">InterTree::set_first_child_UNSAFE</span><button class="popup" onclick="togglePopup('usagePopup13')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup13">Usage of <span class="code-font"><span class="function-syntax">InterTree::set_first_child_UNSAFE</span></span>:<br/><a href="2-it.html#SP3_1">&#167;3.1</a>, <a href="2-it.html#SP3_2">&#167;3.2</a>, <a href="2-it.html#SP3_3">&#167;3.3</a>, <a href="2-it.html#SP3_5">&#167;3.5</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">inter_tree_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">F</span><span class="plain-syntax">, </span><span class="reserved-syntax">inter_tree_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">V</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">F</span><span class="plain-syntax">) </span><span class="identifier-syntax">F</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">first_child_itn</span><span class="plain-syntax"> = </span><span class="identifier-syntax">V</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">InterTree::set_last_child_UNSAFE</span><button class="popup" onclick="togglePopup('usagePopup14')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup14">Usage of <span class="code-font"><span class="function-syntax">InterTree::set_last_child_UNSAFE</span></span>:<br/><a href="2-it.html#SP3_1">&#167;3.1</a>, <a href="2-it.html#SP3_2">&#167;3.2</a>, <a href="2-it.html#SP3_3">&#167;3.3</a>, <a href="2-it.html#SP3_4">&#167;3.4</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">inter_tree_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">F</span><span class="plain-syntax">, </span><span class="reserved-syntax">inter_tree_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">V</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">F</span><span class="plain-syntax">) </span><span class="identifier-syntax">F</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">last_child_itn</span><span class="plain-syntax"> = </span><span class="identifier-syntax">V</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">InterTree::set_parent_UNSAFE</span><button class="popup" onclick="togglePopup('usagePopup15')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup15">Usage of <span class="code-font"><span class="function-syntax">InterTree::set_parent_UNSAFE</span></span>:<br/><a href="2-it.html#SP3_1">&#167;3.1</a>, <a href="2-it.html#SP3_2">&#167;3.2</a>, <a href="2-it.html#SP3_3">&#167;3.3</a>, <a href="2-it.html#SP3_4">&#167;3.4</a>, <a href="2-it.html#SP3_5">&#167;3.5</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">inter_tree_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">F</span><span class="plain-syntax">, </span><span class="reserved-syntax">inter_tree_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">V</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">F</span><span class="plain-syntax">) </span><span class="identifier-syntax">F</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">parent_itn</span><span class="plain-syntax"> = </span><span class="identifier-syntax">V</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
</pre>
<p class="commentary firstcommentary"><a id="SP5" class="paragraph-anchor"></a><b>&#167;5. </b></p>
<pre class="definitions code-font"><span class="definition-keyword">define</span> <span class="identifier-syntax">LOOP_THROUGH_INTER_CHILDREN</span><span class="plain-syntax">(</span><span class="identifier-syntax">F</span><span class="plain-syntax">, </span><span class="identifier-syntax">P</span><span class="plain-syntax">)</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">for</span><span class="plain-syntax"> (</span><span class="reserved-syntax">inter_tree_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">F</span><span class="plain-syntax"> = </span><a href="2-it.html#SP2" class="function-link"><span class="function-syntax">InterTree::first_child</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">P</span><span class="plain-syntax">); </span><span class="identifier-syntax">F</span><span class="plain-syntax">; </span><span class="identifier-syntax">F</span><span class="plain-syntax"> = </span><a href="2-it.html#SP2" class="function-link"><span class="function-syntax">InterTree::next</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">F</span><span class="plain-syntax">))</span>
<span class="definition-keyword">define</span> <span class="identifier-syntax">PROTECTED_LOOP_THROUGH_INTER_CHILDREN</span><span class="plain-syntax">(</span><span class="identifier-syntax">F</span><span class="plain-syntax">, </span><span class="identifier-syntax">P</span><span class="plain-syntax">)</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">for</span><span class="plain-syntax"> (</span><span class="reserved-syntax">inter_tree_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">F</span><span class="plain-syntax"> = </span><a href="2-it.html#SP2" class="function-link"><span class="function-syntax">InterTree::first_child</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">P</span><span class="plain-syntax">), *</span><span class="identifier-syntax">FN</span><span class="plain-syntax"> = </span><span class="identifier-syntax">F</span><span class="plain-syntax">?(</span><a href="2-it.html#SP2" class="function-link"><span class="function-syntax">InterTree::next</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">F</span><span class="plain-syntax">)):</span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">F</span><span class="plain-syntax">; </span><span class="identifier-syntax">F</span><span class="plain-syntax"> = </span><span class="identifier-syntax">FN</span><span class="plain-syntax">, </span><span class="identifier-syntax">FN</span><span class="plain-syntax"> = </span><span class="identifier-syntax">FN</span><span class="plain-syntax">?(</span><a href="2-it.html#SP2" class="function-link"><span class="function-syntax">InterTree::next</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">FN</span><span class="plain-syntax">)):</span><span class="identifier-syntax">NULL</span><span class="plain-syntax">)</span>
</pre>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">InterTree::traverse_root_only</span><button class="popup" onclick="togglePopup('usagePopup16')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup16">Usage of <span class="code-font"><span class="function-syntax">InterTree::traverse_root_only</span></span>:<br/>Inter in Binary Files - <a href="3-iibf.html#SP1_1_5">&#167;1.1.5</a><br/>Inter in Text Files - <a href="3-iitf.html#SP2">&#167;2</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">inter_tree</span><span class="plain-syntax"> *</span><span class="identifier-syntax">from</span><span class="plain-syntax">, </span><span class="reserved-syntax">void</span><span class="plain-syntax"> (*</span><span class="identifier-syntax">visitor</span><span class="plain-syntax">)(</span><span class="reserved-syntax">inter_tree</span><span class="plain-syntax"> *, </span><span class="reserved-syntax">inter_tree_node</span><span class="plain-syntax"> *, </span><span class="reserved-syntax">void</span><span class="plain-syntax"> *), </span><span class="reserved-syntax">void</span><span class="plain-syntax"> *</span><span class="identifier-syntax">state</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">filter</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">PROTECTED_LOOP_THROUGH_INTER_CHILDREN</span><span class="plain-syntax">(</span><span class="identifier-syntax">P</span><span class="plain-syntax">, </span><span class="identifier-syntax">from</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">root_node</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">filter</span><span class="plain-syntax"> == </span><span class="constant-syntax">0</span><span class="plain-syntax">) ||</span>
<span class="plain-syntax"> ((</span><span class="identifier-syntax">filter</span><span class="plain-syntax"> &gt; </span><span class="constant-syntax">0</span><span class="plain-syntax">) &amp;&amp; (</span><span class="identifier-syntax">P</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">W</span><span class="plain-syntax">.</span><span class="element-syntax">data</span><span class="plain-syntax">[</span><span class="constant-syntax">ID_IFLD</span><span class="plain-syntax">] == (</span><span class="constant-syntax">inter_ti</span><span class="plain-syntax">) </span><span class="identifier-syntax">filter</span><span class="plain-syntax">)) ||</span>
<span class="plain-syntax"> ((</span><span class="identifier-syntax">filter</span><span class="plain-syntax"> &lt; </span><span class="constant-syntax">0</span><span class="plain-syntax">) &amp;&amp; (</span><span class="identifier-syntax">P</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">W</span><span class="plain-syntax">.</span><span class="element-syntax">data</span><span class="plain-syntax">[</span><span class="constant-syntax">ID_IFLD</span><span class="plain-syntax">] != (</span><span class="constant-syntax">inter_ti</span><span class="plain-syntax">) -</span><span class="identifier-syntax">filter</span><span class="plain-syntax">)))</span>
<span class="plain-syntax"> (*</span><span class="identifier-syntax">visitor</span><span class="plain-syntax">)(</span><span class="identifier-syntax">from</span><span class="plain-syntax">, </span><span class="identifier-syntax">P</span><span class="plain-syntax">, </span><span class="identifier-syntax">state</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> }</span>
<span class="plain-syntax">}</span>
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">InterTree::traverse</span><button class="popup" onclick="togglePopup('usagePopup17')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup17">Usage of <span class="code-font"><span class="function-syntax">InterTree::traverse</span></span>:<br/>Symbols Tables - <a href="2-st.html#SP10">&#167;10</a><br/>Transmigration - <a href="2-trn.html#SP1_4">&#167;1.4</a>, <a href="2-trn.html#SP1_5">&#167;1.5</a><br/>Inter in Binary Files - <a href="3-iibf.html#SP1_1_5">&#167;1.1.5</a><br/>Inter in Text Files - <a href="3-iitf.html#SP1">&#167;1</a>, <a href="3-iitf.html#SP2">&#167;2</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">inter_tree</span><span class="plain-syntax"> *</span><span class="identifier-syntax">from</span><span class="plain-syntax">, </span><span class="reserved-syntax">void</span><span class="plain-syntax"> (*</span><span class="identifier-syntax">visitor</span><span class="plain-syntax">)(</span><span class="reserved-syntax">inter_tree</span><span class="plain-syntax"> *, </span><span class="reserved-syntax">inter_tree_node</span><span class="plain-syntax"> *, </span><span class="reserved-syntax">void</span><span class="plain-syntax"> *), </span><span class="reserved-syntax">void</span><span class="plain-syntax"> *</span><span class="identifier-syntax">state</span><span class="plain-syntax">, </span><span class="reserved-syntax">inter_package</span><span class="plain-syntax"> *</span><span class="identifier-syntax">mp</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">filter</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">mp</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="identifier-syntax">mp</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Site::main_package_if_it_exists</span><span class="plain-syntax">(</span><span class="identifier-syntax">from</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">mp</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">inter_tree_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">D</span><span class="plain-syntax"> = </span><a href="2-pck.html#SP3" class="function-link"><span class="function-syntax">Inter::Packages::definition</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">mp</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">filter</span><span class="plain-syntax"> == </span><span class="constant-syntax">0</span><span class="plain-syntax">) ||</span>
<span class="plain-syntax"> ((</span><span class="identifier-syntax">filter</span><span class="plain-syntax"> &gt; </span><span class="constant-syntax">0</span><span class="plain-syntax">) &amp;&amp; (</span><span class="identifier-syntax">D</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">W</span><span class="plain-syntax">.</span><span class="element-syntax">data</span><span class="plain-syntax">[</span><span class="constant-syntax">ID_IFLD</span><span class="plain-syntax">] == (</span><span class="constant-syntax">inter_ti</span><span class="plain-syntax">) </span><span class="identifier-syntax">filter</span><span class="plain-syntax">)) ||</span>
<span class="plain-syntax"> ((</span><span class="identifier-syntax">filter</span><span class="plain-syntax"> &lt; </span><span class="constant-syntax">0</span><span class="plain-syntax">) &amp;&amp; (</span><span class="identifier-syntax">D</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">W</span><span class="plain-syntax">.</span><span class="element-syntax">data</span><span class="plain-syntax">[</span><span class="constant-syntax">ID_IFLD</span><span class="plain-syntax">] != (</span><span class="constant-syntax">inter_ti</span><span class="plain-syntax">) -</span><span class="identifier-syntax">filter</span><span class="plain-syntax">)))</span>
<span class="plain-syntax"> (*</span><span class="identifier-syntax">visitor</span><span class="plain-syntax">)(</span><span class="identifier-syntax">from</span><span class="plain-syntax">, </span><span class="identifier-syntax">D</span><span class="plain-syntax">, </span><span class="identifier-syntax">state</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><a href="2-it.html#SP5" class="function-link"><span class="function-syntax">InterTree::traverse_r</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">from</span><span class="plain-syntax">, </span><span class="identifier-syntax">D</span><span class="plain-syntax">, </span><span class="identifier-syntax">visitor</span><span class="plain-syntax">, </span><span class="identifier-syntax">state</span><span class="plain-syntax">, </span><span class="identifier-syntax">filter</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> }</span>
<span class="plain-syntax">}</span>
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">InterTree::traverse_r</span><span class="plain-syntax">(</span><span class="reserved-syntax">inter_tree</span><span class="plain-syntax"> *</span><span class="identifier-syntax">from</span><span class="plain-syntax">, </span><span class="reserved-syntax">inter_tree_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">P</span><span class="plain-syntax">, </span><span class="reserved-syntax">void</span><span class="plain-syntax"> (*</span><span class="identifier-syntax">visitor</span><span class="plain-syntax">)(</span><span class="reserved-syntax">inter_tree</span><span class="plain-syntax"> *, </span><span class="reserved-syntax">inter_tree_node</span><span class="plain-syntax"> *, </span><span class="reserved-syntax">void</span><span class="plain-syntax"> *), </span><span class="reserved-syntax">void</span><span class="plain-syntax"> *</span><span class="identifier-syntax">state</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">filter</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">PROTECTED_LOOP_THROUGH_INTER_CHILDREN</span><span class="plain-syntax">(</span><span class="identifier-syntax">C</span><span class="plain-syntax">, </span><span class="identifier-syntax">P</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">filter</span><span class="plain-syntax"> == </span><span class="constant-syntax">0</span><span class="plain-syntax">) ||</span>
<span class="plain-syntax"> ((</span><span class="identifier-syntax">filter</span><span class="plain-syntax"> &gt; </span><span class="constant-syntax">0</span><span class="plain-syntax">) &amp;&amp; (</span><span class="identifier-syntax">C</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">W</span><span class="plain-syntax">.</span><span class="element-syntax">data</span><span class="plain-syntax">[</span><span class="constant-syntax">ID_IFLD</span><span class="plain-syntax">] == (</span><span class="constant-syntax">inter_ti</span><span class="plain-syntax">) </span><span class="identifier-syntax">filter</span><span class="plain-syntax">)) ||</span>
<span class="plain-syntax"> ((</span><span class="identifier-syntax">filter</span><span class="plain-syntax"> &lt; </span><span class="constant-syntax">0</span><span class="plain-syntax">) &amp;&amp; (</span><span class="identifier-syntax">C</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">W</span><span class="plain-syntax">.</span><span class="element-syntax">data</span><span class="plain-syntax">[</span><span class="constant-syntax">ID_IFLD</span><span class="plain-syntax">] != (</span><span class="constant-syntax">inter_ti</span><span class="plain-syntax">) -</span><span class="identifier-syntax">filter</span><span class="plain-syntax">)))</span>
<span class="plain-syntax"> (*</span><span class="identifier-syntax">visitor</span><span class="plain-syntax">)(</span><span class="identifier-syntax">from</span><span class="plain-syntax">, </span><span class="identifier-syntax">C</span><span class="plain-syntax">, </span><span class="identifier-syntax">state</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><a href="2-it.html#SP5" class="function-link"><span class="function-syntax">InterTree::traverse_r</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">from</span><span class="plain-syntax">, </span><span class="identifier-syntax">C</span><span class="plain-syntax">, </span><span class="identifier-syntax">visitor</span><span class="plain-syntax">, </span><span class="identifier-syntax">state</span><span class="plain-syntax">, </span><span class="identifier-syntax">filter</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> }</span>
<span class="plain-syntax">}</span>
</pre>
<p class="commentary firstcommentary"><a id="SP6" class="paragraph-anchor"></a><b>&#167;6. </b></p>
<pre class="definitions code-font"><span class="definition-keyword">define</span> <span class="identifier-syntax">LOOP_THROUGH_SUBPACKAGES</span><span class="plain-syntax">(</span><span class="identifier-syntax">entry</span><span class="plain-syntax">, </span><span class="identifier-syntax">pack</span><span class="plain-syntax">, </span><span class="identifier-syntax">ptype</span><span class="plain-syntax">)</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">inter_symbol</span><span class="plain-syntax"> *</span><span class="identifier-syntax">pack</span><span class="plain-syntax">##</span><span class="identifier-syntax">wanted</span><span class="plain-syntax"> = (</span><span class="identifier-syntax">pack</span><span class="plain-syntax">)?(</span><span class="identifier-syntax">PackageTypes::get</span><span class="plain-syntax">(</span><span class="identifier-syntax">pack</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">package_head</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">tree</span><span class="plain-syntax">, </span><span class="identifier-syntax">ptype</span><span class="plain-syntax">)):</span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">pack</span><span class="plain-syntax">)</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">LOOP_THROUGH_INTER_CHILDREN</span><span class="plain-syntax">(</span><span class="identifier-syntax">C</span><span class="plain-syntax">, </span><a href="2-pck.html#SP3" class="function-link"><span class="function-syntax">Inter::Packages::definition</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">pack</span><span class="plain-syntax">))</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">C</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">W</span><span class="plain-syntax">.</span><span class="element-syntax">data</span><span class="plain-syntax">[</span><span class="constant-syntax">ID_IFLD</span><span class="plain-syntax">] == </span><span class="constant-syntax">PACKAGE_IST</span><span class="plain-syntax">) &amp;&amp;</span>
<span class="plain-syntax"> (</span><span class="identifier-syntax">entry</span><span class="plain-syntax"> = </span><a href="4-tpc3.html#SP2" class="function-link"><span class="function-syntax">Inter::Package::defined_by_frame</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">C</span><span class="plain-syntax">)) &amp;&amp;</span>
<span class="plain-syntax"> (</span><a href="2-pck.html#SP3" class="function-link"><span class="function-syntax">Inter::Packages::type</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">entry</span><span class="plain-syntax">) == </span><span class="identifier-syntax">pack</span><span class="plain-syntax">##</span><span class="identifier-syntax">wanted</span><span class="plain-syntax">))</span>
</pre>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">InterTree::no_subpackages</span><span class="plain-syntax">(</span><span class="reserved-syntax">inter_package</span><span class="plain-syntax"> *</span><span class="identifier-syntax">pack</span><span class="plain-syntax">, </span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">ptype</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">N</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">pack</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">inter_package</span><span class="plain-syntax"> *</span><span class="identifier-syntax">entry</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">LOOP_THROUGH_SUBPACKAGES</span><span class="plain-syntax">(</span><span class="identifier-syntax">entry</span><span class="plain-syntax">, </span><span class="identifier-syntax">pack</span><span class="plain-syntax">, </span><span class="identifier-syntax">ptype</span><span class="plain-syntax">) </span><span class="identifier-syntax">N</span><span class="plain-syntax">++;</span>
<span class="plain-syntax"> }</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">N</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
</pre>
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