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<!--Weave of 'The Player' generated by Inweb-->
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<ul class="crumbs"><li><a href="../index.html">Home</a></li><li><a href="../compiler.html">Inform7</a></li><li><a href="index.html">runtime</a></li><li><a href="index.html#6">Chapter 6: World Model</a></li><li><b>The Player</b></li></ul></div>
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<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>§1. </b>A special Inter array holds enough details about the initial situation of
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the player for <span class="extract"><span class="extract-syntax">WorldModelKit</span></span> to get things started.
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">RTPlayer::InitialSituation</span><span class="plain-syntax">(</span><span class="reserved-syntax">void</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><a href="6-tp.html#SP1" class="function-link"><span class="function-syntax">RTPlayer::InitialSituation_define</span></a><span class="plain-syntax">(</span><span class="constant-syntax">PLAYER_OBJECT_INIS_HL</span><span class="plain-syntax">, </span><span class="constant-syntax">0</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><a href="6-tp.html#SP1" class="function-link"><span class="function-syntax">RTPlayer::InitialSituation_define</span></a><span class="plain-syntax">(</span><span class="constant-syntax">START_OBJECT_INIS_HL</span><span class="plain-syntax">, </span><span class="constant-syntax">1</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><a href="6-tp.html#SP1" class="function-link"><span class="function-syntax">RTPlayer::InitialSituation_define</span></a><span class="plain-syntax">(</span><span class="constant-syntax">START_ROOM_INIS_HL</span><span class="plain-syntax">, </span><span class="constant-syntax">2</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><a href="6-tp.html#SP1" class="function-link"><span class="function-syntax">RTPlayer::InitialSituation_define</span></a><span class="plain-syntax">(</span><span class="constant-syntax">START_TIME_INIS_HL</span><span class="plain-syntax">, </span><span class="constant-syntax">3</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><a href="6-tp.html#SP1" class="function-link"><span class="function-syntax">RTPlayer::InitialSituation_define</span></a><span class="plain-syntax">(</span><span class="constant-syntax">DONE_INIS_HL</span><span class="plain-syntax">, </span><span class="constant-syntax">4</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">inter_name</span><span class="plain-syntax"> *</span><span class="identifier-syntax">iname</span><span class="plain-syntax"> = </span><a href="2-hrr.html#SP4" class="function-link"><span class="function-syntax">Hierarchy::find</span></a><span class="plain-syntax">(</span><span class="constant-syntax">INITIALSITUATION_HL</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">packaging_state</span><span class="plain-syntax"> </span><span class="identifier-syntax">save</span><span class="plain-syntax"> = </span><a href="2-emt.html#SP3" class="function-link"><span class="function-syntax">Emit::named_array_begin</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">iname</span><span class="plain-syntax">, </span><span class="identifier-syntax">K_value</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><a href="5-vrb.html#SP8" class="function-link"><span class="function-syntax">RTVariables::emit_initial_value</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">player_VAR</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">start_object</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><a href="2-emt.html#SP3" class="function-link"><span class="function-syntax">Emit::array_numeric_entry</span></a><span class="plain-syntax">(0);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">else</span><span class="plain-syntax"> </span><a href="2-emt.html#SP3" class="function-link"><span class="function-syntax">Emit::array_iname_entry</span></a><span class="plain-syntax">(</span><a href="5-ins.html#SP1" class="function-link"><span class="function-syntax">RTInstances::iname</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">start_object</span><span class="plain-syntax">));</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">start_room</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><a href="2-emt.html#SP3" class="function-link"><span class="function-syntax">Emit::array_numeric_entry</span></a><span class="plain-syntax">(0);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">else</span><span class="plain-syntax"> </span><a href="2-emt.html#SP3" class="function-link"><span class="function-syntax">Emit::array_iname_entry</span></a><span class="plain-syntax">(</span><a href="5-ins.html#SP1" class="function-link"><span class="function-syntax">RTInstances::iname</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">start_room</span><span class="plain-syntax">));</span>
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<span class="plain-syntax"> </span><a href="5-vrb.html#SP8" class="function-link"><span class="function-syntax">RTVariables::emit_initial_value</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">time_of_day_VAR</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><a href="2-emt.html#SP3" class="function-link"><span class="function-syntax">Emit::array_numeric_entry</span></a><span class="plain-syntax">(0);</span>
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<span class="plain-syntax"> </span><a href="2-emt.html#SP3" class="function-link"><span class="function-syntax">Emit::array_end</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">save</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><a href="2-hrr.html#SP4" class="function-link"><span class="function-syntax">Hierarchy::make_available</span></a><span class="plain-syntax">(</span><a href="2-emt.html#SP2" class="function-link"><span class="function-syntax">Emit::tree</span></a><span class="plain-syntax">(), </span><span class="identifier-syntax">iname</span><span class="plain-syntax">);</span>
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<span class="plain-syntax">}</span>
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">RTPlayer::InitialSituation_define</span><span class="plain-syntax">(</span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">id</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">val</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">inter_name</span><span class="plain-syntax"> *</span><span class="identifier-syntax">iname</span><span class="plain-syntax"> = </span><a href="2-hrr.html#SP4" class="function-link"><span class="function-syntax">Hierarchy::find</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">id</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><a href="2-emt.html#SP3" class="function-link"><span class="function-syntax">Emit::named_array_begin</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">iname</span><span class="plain-syntax">, </span><span class="identifier-syntax">K_value</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><a href="2-emt.html#SP3" class="function-link"><span class="function-syntax">Emit::named_numeric_constant</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">iname</span><span class="plain-syntax">, (</span><span class="identifier-syntax">inter_ti</span><span class="plain-syntax">) </span><span class="identifier-syntax">val</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><a href="2-hrr.html#SP4" class="function-link"><span class="function-syntax">Hierarchy::make_available</span></a><span class="plain-syntax">(</span><a href="2-emt.html#SP2" class="function-link"><span class="function-syntax">Emit::tree</span></a><span class="plain-syntax">(), </span><span class="identifier-syntax">iname</span><span class="plain-syntax">);</span>
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<span class="plain-syntax">}</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP2" class="paragraph-anchor"></a><b>§2. </b>"Player" is set in an unusual way. That is, Inform does not compile
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</p>
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<blockquote>
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<p>now the player is Mr Chasuble;</p>
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</blockquote>
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<p class="commentary">to something like <span class="extract"><span class="extract-syntax">player = O31_mr_chasuble</span></span>, as it would do for a typical
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variable. It's very important that code compiled by Inform 7 doesn't do
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this, because if executed it would break the invariants for <span class="extract"><span class="extract-syntax">WorldModelKit</span></span>
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variables about the current situation. The correct thing is always to call
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the function <span class="extract"><span class="extract-syntax">ChangePlayer</span></span> instead:
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">RTPlayer::player_schema</span><span class="plain-syntax">(</span><span class="identifier-syntax">nonlocal_variable</span><span class="plain-syntax"> *</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><a href="5-vrb.html#SP7" class="function-link"><span class="function-syntax">RTVariables::set_write_schema</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"ChangePlayer(*2)"</span><span class="plain-syntax">);</span>
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<span class="plain-syntax">}</span>
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