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< title > Equations< / title >
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<!-- Weave of 'Equations' 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#5" > Chapter 5: Local Resources< / a > < / li > < li > < b > Equations< / b > < / li > < / ul > < / div >
< p class = "purpose" > To compile a local _equation package for each equation in a compilation unit.< / p >
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< p class = "commentary firstcommentary" > < a id = "SP1" class = "paragraph-anchor" > < / a > < b > § 1. < / b > Each equation has a distinct runtime identifier, which in fact is a stub
function returning false; but because these functions are all different,
they provide values different from each other and from all other functions.
< / p >
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< p class = "commentary" > There is otherwise nothing to see. Equations are solved using inline code,
not here; see < a href = "../imperative-module/5-cste.html" class = "internal" > Compile Solutions to Equations (in imperative)< / a > .
< / p >
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< pre class = "displayed-code all-displayed-code code-font" >
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< 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" > equation_compilation_data< / 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" > inter_name< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > eqn_iname< / span > < span class = "plain-syntax" > ; < / span > < span class = "comment-syntax" > used at run-time to identify this< / span >
< span class = "plain-syntax" > } < / span > < span class = "reserved-syntax" > equation_compilation_data< / span > < span class = "plain-syntax" > ;< / span >
< span class = "reserved-syntax" > equation_compilation_data< / span > < span class = "plain-syntax" > < / span > < span class = "function-syntax" > RTEquations::new_compilation_data< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > equation< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > eqn< / span > < span class = "plain-syntax" > ) {< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > equation_compilation_data< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > ecd< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > package_request< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > P< / span > < span class = "plain-syntax" > = < / span > < a href = "2-hrr.html#SP19" class = "function-link" > < span class = "function-syntax" > Hierarchy::local_package< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "constant-syntax" > EQUATIONS_HAP< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > ecd< / span > < span class = "plain-syntax" > .< / span > < span class = "element-syntax" > eqn_iname< / span > < span class = "plain-syntax" > = < / span > < a href = "2-hrr.html#SP12" class = "function-link" > < span class = "function-syntax" > Hierarchy::make_iname_in< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "constant-syntax" > IDENTIFIER_FN_HL< / 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" > return< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > ecd< / 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 = "function-syntax" > RTEquations::identifier< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > equation< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > eqn< / span > < span class = "plain-syntax" > ) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > eqn< / span > < span class = "plain-syntax" > -> < / span > < span class = "identifier-syntax" > compilation_data< / span > < span class = "plain-syntax" > .< / span > < span class = "identifier-syntax" > eqn_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" > RTEquations::compile< / 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 > < span class = "identifier-syntax" > equation< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > eqn< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > LOOP_OVER< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > eqn< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > equation< / 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 > < span class = "identifier-syntax" > Functions::begin< / span > < span class = "plain-syntax" > (< / span > < a href = "5-eqt.html#SP1" class = "function-link" > < span class = "function-syntax" > RTEquations::identifier< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > eqn< / span > < span class = "plain-syntax" > ));< / span >
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< span class = "plain-syntax" > < / span > < a href = "2-ec.html#SP11" class = "function-link" > < span class = "function-syntax" > EmitCode::rfalse< / span > < / a > < span class = "plain-syntax" > ();< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > Functions::end< / span > < 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 >
< span class = "plain-syntax" > }< / span >
< / pre >
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< ul class = "endnotetexts" > < li > The structure equation_compilation_data is private to this section.< / li > < / ul >
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