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[SVN r15198]
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Paul Mensonides
2002-09-08 09:40:56 +00:00
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<html>
<head>
<title>BOOST_PP_INCLUDE_SELF</title>
<link rel="stylesheet" type="text/css" href="../styles.css">
<script language="javascript" type="text/javascript" src="../scripts.js"></script>
</head>
<body onload="init('sample');">
<div style="margin-left: 0px;">
The <b>BOOST_PP_INCLUDE_SELF</b> macro includes a file indirectly.
</div>
<h4>Usage</h4>
<div class="code">
#include <b>BOOST_PP_INCLUDE_SELF</b>()
</div>
<h4>Arguments</h4>
<dl>
<dt>filename</dt>
<dd>
A quoted or angle-bracketed filename to be included by <b>BOOST_PP_INCLUDE_SELF</b>.
</dd>
</dl>
<h4>Remarks</h4>
<div>
<b>BOOST_PP_INDIRECT_SELF</b> must be defined prior to using this macro.
</div>
<div>
Most preprocessors will not allow a file to directly include itself--even when the file protects itself from such a scenario.&nbsp;
This macro, in combination with <b>BOOST_PP_INDIRECT_SELF</b> allows a file to include itself indirectly.
</div>
<div>
While <b>BOOST_PP_INDIRECT_SELF</b> is being included, <b>BOOST_PP_INCLUDE_SELF</b> defines the macro <b>BOOST_PP_IS_SELFISH</b> to <i>1</i>.&nbsp;
When it returns from the inclusion, <b>BOOST_PP_IS_SELFISH</b> is undefined.
</div>
<h4>See Also</h4>
<ul>
<li><a href="indirect_self.html">BOOST_PP_INDIRECT_SELF</a></li>
<li><a href="is_selfish.html">BOOST_PP_IS_SELFISH</a></li>
</ul>
<h4>Requirements</h4>
<div>
<b>Header:</b> &nbsp;<a href="../headers/iteration/self.hpp.html">&lt;boost/preprocessor/iteration/self.hpp&gt;</a>
</div>
<h4><a class="local" onclick="toggle('sample');" onmouseover="change(this);" onmouseout="revert(this);">Sample Code</a></h4>
<div id="sample"><pre>
// file.h
#if !BOOST_PP_IS_SELFISH
#ifndef FILE_H_
#define FILE_H_
#include &lt;boost/preprocessor/iteration/self.hpp&gt;
#define NAME X
struct NAME {
// ...
#define BOOST_PP_INDIRECT_SELF "file.h"
#include BOOST_PP_INCLUDE_SELF()
};
#define NAME Y
struct NAME {
// ...
#define BOOST_PP_INDIRECT_SELF "file.h"
#include BOOST_PP_INCLUDE_SELF()
};
#define NAME Z
struct NAME {
// ...
#define BOOST_PP_INDIRECT_SELF "file.h"
#include BOOST_PP_INCLUDE_SELF()
};
#endif
#else
inline bool validate(NAME* p) {
return true;
}
template&lt;class T&gt; bool validate(T* p) {
return dynamic_cast&lt;NAME*&gt;(p);
}
#undef NAME
#endif
<pre></div>
</body>
</html>