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API cleanup. Documentation

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git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/trunk@9631 626c5289-ae23-0410-ae9c-e8d60b6d4f22
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Dave Beazley 2007-01-03 05:23:20 +00:00
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@ -18,11 +18,11 @@ The following documentation describe the internal APIs used by SWIG. These may
<li><a href="file.html">File handling functions</a>
<li><a href="cmdopt.html">Command line arguments</a>
<li><a href="tree.html">Parse tree navigation and manipulation</a>
<li><a href="parm.html">Parameter and Parameter list handling functions</a>
</ul>
<hr>
Copyright (C) 1999-2004 SWIG Development Team.
Copyright (C) 1999-2007 SWIG Development Team.
</body>
</html>

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<html>
<head>
<title>SWIG Parameter Handling</title>
</head>
<body>
<center>
<h1>SWIG Parameter Handling</h1>
<p>
David M. Beazley <br>
dave-swig@dabeaz.com<br>
January 2, 2007<br>
</b>
</center>
<h2>Introduction</h2>
This document describes the functions related to management of function parameters and parameter lists in the SWIG core. These functions are declared in <tt>Source/Swig/swigparm.h</tt>. This API is considered to be stable.
<h2>Parameters</h2>
The following utility functions are used to create and copy individual parameters. In their most basic form, a parameter merely contains a type, a name, and an optional default value.
<p>
<b><tt>Parm *NewParm(SwigType *type, const String_or_char *name)</tt></b>
<blockquote>
Creates a new parameter object with type <tt>type</tt> and name <tt>name</tt>. The type is stored in the attribute "type" and the name is stored in the attribute "name".
</blockquote>
<p>
<b><tt>Parm *CopyParm(Parm *p)</tt></b>
<blockquote>
Copies a parameter object. All string attributes are copied in the
process of making the copy. However, no complex attributes (lists,
hashes, etc.) are copied.
</blockquote>
<h2>Parameter Lists</h2>
<p>
<b><tt>ParmList *CopyParmList(ParmList *p)</tt></b>
<blockquote>
Creates a copy of a parameter list. A parameter list is merely a linked list of parameters created by NewParm().
</blockquote>
<p>
<b><tt>ParmList *CopyParmListMax(ParmList *p, int count)</tt></b>
<blockquote>
Copies at most <tt>count</tt> parameters from the parameter list <tt>p</tt>.
</blockquote>
<p>
<b><tt>int ParmList_len(ParmList *p)</tt></b>
<blockquote>
Returns the total number of parameters in a parameter list.
</blockquote>
<p>
<b><tt>int ParmList_numarg(ParmList *p)</tt></b>
<blockquote>
Returns the number of non-ignored parameters in a parameter list. Any parameter with an "ignore" attribute is ignored in the count.
</blockquote>
<p>
<b><tt>int ParmList_numrequired(ParmList *p)</tt></b>
<blockquote>
Returns the number of required parameters in a parameter list. This pertains to invoking a function/method in C/C++.
</blockquote>
<p>
<b><tt>int ParmList_has_defaultargs(ParmList *p)</tt></b>
<blockquote>
Returns 1 if the parameter list has any default arguments. Otherwise returns 0.
</blockquote>
<h2>Code Generation Functions</h2>
<p>
<b><tt>String *ParmList_str(ParmList *p)</tt></b>
<blockquote>
Creates a C prototype string of the parameters, but without any default values.
</blockquote>
<p>
<b><tt>String *ParmList_str_defaultargs(ParmList *p)</tt></b>
<blockquote>
Creates a C prototype string of the parameters and includes the default values (if any).
</blockquote>
<p>
<b><tt>String *ParmList_protostr(ParmList *p)</tt></b>
<blockquote>
Creates a C prototype string of the parameters. Does not include any hidden parameters.
</blockquote>
</body>
</html>