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92 lines
2.6 KiB
HTML
92 lines
2.6 KiB
HTML
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<html>
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<head>
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<title>BOOST_PP_RELATIVE_ITERATION</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_RELATIVE_ITERATION</b> macro expands to the iteration value of a <i>file-iteration</i> depth relative to the current depth.
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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_RELATIVE_ITERATION</b>(<i>i</i>)
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</div>
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<h4>Arguments</h4>
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<dl>
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<dt>i</dt>
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<dd>
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The relative depth of the frame whose iteration value is to be retreived.
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Valid values range from <i>0</i> to <b>BOOST_PP_ITERATION_DEPTH</b>() - <i>1</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 is only valid when a <i>file-iteration</i> is in progress.
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</div>
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<div>
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The argument <i>i</i> is interpreted as the number of frames <i>outward</i> from the current frame.
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Therefore, <b>BOOST_PP_RELATIVE_ITERATION</b>(<i>0</i>) is equivalent to <b>BOOST_PP_ITERATION</b>().
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</div>
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<h4>Requirements</h4>
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<div>
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<b>Header:</b> <a href="../headers/iteration/iterate.hpp.html"><boost/preprocessor/iteration/iterate.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_ITERATING
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#ifndef FILE_H_
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#define FILE_H_
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#include <boost/preprocessor/iteration/iterate.hpp>
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1st iteration:
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#define BOOST_PP_ITERATION_PARAMS_1 (4, (0, 3, "file.h", 0x0001))
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#include BOOST_PP_ITERATE()
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2nd iteration:
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#define BOOST_PP_ITERATION_PARAMS_1 (4, (1, 10, "file.h", 0x0002))
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#include BOOST_PP_ITERATE()
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#endif
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#elif BOOST_PP_ITERATION_DEPTH() == 1 /* ... */ \
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&& BOOST_PP_ITERATION_FLAGS() == 0x0001 \
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/**/
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--
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#define BOOST_PP_ITERATION_PARAMS_2 (3, (1, 10, "file.h"))
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#include BOOST_PP_ITERATE()
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#elif BOOST_PP_ITERATION_DEPTH() == 1 /* ... */ \
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&& BOOST_PP_ITERATION_FLAGS() == 0x0002 \
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/**/
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--
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#define BOOST_PP_ITERATION_PARAMS_2 /* ... */ \
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(3, (1, BOOST_PP_ITERATION(), "file.h")) \
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/**/
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#include BOOST_PP_ITERATE()
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#elif BOOST_PP_ITERATION_DEPTH() == 2 /* ... */ \
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&& BOOST_PP_FRAME_FLAGS(1) == 0x0001 \
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/**/
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--
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#define BOOST_PP_ITERATION_PARAMS_3 /* ... */ \
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(3, (1, BOOST_PP_ITERATION(), "file.h")) \
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/**/
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#include BOOST_PP_ITERATE()
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#else // used by both
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previous: BOOST_PP_RELATIVE_ITERATION(1)
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current: BOOST_PP_ITERATION()
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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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