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71 lines
2.8 KiB
HTML
71 lines
2.8 KiB
HTML
<html>
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<head>
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<title>BOOST_PP_ENUM</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_ENUM</b> macro generates a comma-separated list.
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</div>
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<h4>Usage</h4>
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<div class="code">
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<b>BOOST_PP_ENUM</b>(<i>count</i>, <i>macro</i>, <i>data</i>)
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</div>
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<h4>Arguments</h4>
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<dl>
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<dt>count</dt>
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<dd>
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The number of repetitious calls to <i>macro</i>.
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Valid values range from <i>0</i> to <b>BOOST_PP_LIMIT_REPEAT</b>.
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</dd>
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<dt>macro</dt>
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<dd class="incompatibility">
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A ternary operation of the form <i>macro</i>(<i>z</i>, <i>n</i>, <i>data</i>).
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This macro is expanded by <b>BOOST_PP_ENUM</b> with the next available repetition depth,
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the current repetition number, and the auxiliary <i>data</i> argument.
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</dd>
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<dt>data</dt>
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<dd>
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Auxiliary data passed to <i>macro</i>.
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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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This macro expands to the comma-separated sequence:
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<div class="incompatibility">
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<i>macro</i>(<i>z</i>, <i>0</i>, <i>data</i>), <i>macro</i>(<i>z</i>, <i>1</i>, <i>data</i>), ... <i>macro</i>(<i>z</i>, <i>count</i> - <i>1</i>, <i>data</i>)
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</div>
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</div>
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<div>
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The <i>z</i> value that is passed to <i>macro</i> represents the next available repetition dimension.
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Other macros that have <b>_Z</b> suffix variants internally use <b>BOOST_PP_REPEAT</b>--for example, <b>BOOST_PP_ENUM_PARAMS</b> and <b>BOOST_PP_ENUM_PARAMS_Z</b>.
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Using these <b>_Z</b> versions is not strictly necessary, but passing the <i>z</i> value (that is passed to <i>macro</i>) to these macros allows them to reenter <b>BOOST_PP_REPEAT</b> with maximum efficiency.
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</div>
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<div>
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To directly use this <i>z</i> value, rather than simply passing it to another macro, see <b>BOOST_PP_ENUM_<i>z</i></b>.
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</div>
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<div>
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Previously, this macro could not be used recursively inside <b>BOOST_PP_REPEAT</b>.
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This limitation no longer exists, as the library can automatically detect the next available repetition depth.
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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="enum_z.html">BOOST_PP_ENUM_<i>z</i></a></li>
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<li><a href="limit_repeat.html">BOOST_PP_LIMIT_REPEAT</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/repetition/enum.hpp.html"><boost/preprocessor/repetition/enum.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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#include <boost/preprocessor/repetition/enum.hpp>
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#define TEXT(z, n, text) text
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BOOST_PP_ENUM(4, TEXT, class) // expands to class, class, class, class
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<pre></div>
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</body>
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</html>
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