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Previous: <a href="Unions.html#Unions" accesskey="p" rel="prev">Unions</a>, Up: <a href="Types.html#Types" accesskey="u" rel="up">Types</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Symbol-Types-Index.html#Symbol-Types-Index" title="Index" rel="index">Index</a>]</p>
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<a name="Function-Types-1"></a>
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<h3 class="section">5.11 Function Types</h3>
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<p>Various types can be defined for function variables. These types are
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not used in defining functions (see <a href="Procedures.html#Procedures">Procedures</a>); they are used for
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things like pointers to functions.
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</p>
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<p>The simple, traditional, type is type descriptor ‘<samp>f</samp>’ is followed by
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type information for the return type of the function, followed by a
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semicolon.
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</p>
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<p>This does not deal with functions for which the number and types of the
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parameters are part of the type, as in Modula-2 or ANSI C. AIX provides
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extensions to specify these, using the ‘<samp>f</samp>’, ‘<samp>F</samp>’, ‘<samp>p</samp>’, and
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‘<samp>R</samp>’ type descriptors.
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</p>
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<p>First comes the type descriptor. If it is ‘<samp>f</samp>’ or ‘<samp>F</samp>’, this
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type involves a function rather than a procedure, and the type
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information for the return type of the function follows, followed by a
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comma. Then comes the number of parameters to the function and a
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semicolon. Then, for each parameter, there is the name of the parameter
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followed by a colon (this is only present for type descriptors ‘<samp>R</samp>’
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and ‘<samp>F</samp>’ which represent Pascal function or procedure parameters),
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type information for the parameter, a comma, 0 if passed by reference or
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1 if passed by value, and a semicolon. The type definition ends with a
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semicolon.
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</p>
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<p>For example, this variable definition:
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</p>
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<div class="example">
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<pre class="example">int (*g_pf)();
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</pre></div>
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<p>generates the following code:
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</p>
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<div class="example">
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<pre class="example">.stabs "g_pf:G24=*25=f1",32,0,0,0
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.common _g_pf,4,"bss"
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</pre></div>
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<p>The variable defines a new type, 24, which is a pointer to another new
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type, 25, which is a function returning <code>int</code>.
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