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