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- <html>
- <head>
- <title>BOOST_PP_REPEAT_FROM_TO_z</title>
- <link rel="stylesheet" type="text/css" href="../styles.css">
- </head>
- <body>
- <div style="margin-left: 0px;">
- The <b>BOOST_PP_REPEAT_FROM_TO_<i>z</i></b> macro represents a reentry into the <b>BOOST_PP_REPEAT_FROM_TO</b> repetition construct.
- </div>
- <h4>Usage</h4>
- <div class="code">
- <b>BOOST_PP_REPEAT_FROM_TO_</b> ## <i>z</i>(<i>first</i>, <i>last</i>, <i>macro</i>, <i>data</i>)
- </div>
- <h4>Arguments</h4>
- <dl>
- <dt>z</dt>
- <dd>
- The next available <b>BOOST_PP_REPEAT</b> dimension.
- </dd>
- <dt>first</dt>
- <dd>
- The lower bound of the repetition.
- Valid values range from <i>0</i> to <b>BOOST_PP_LIMIT_MAG</b>.
- </dd>
- <dt>last</dt>
- <dd>
- The upper bound of the repetition.
- Valid values range from <i>0</i> to <b>BOOST_PP_LIMIT_MAG</b>.
- </dd>
- <dt>macro</dt>
- <dd>
- A ternary operation of the form <i>macro</i>(<i>z</i>, <i>n</i>, <i>data</i>).
- This macro is expanded by <b>BOOST_PP_REPEAT</b> with the next available repetition depth,
- the current repetition number, and the auxiliary <i>data</i> argument.
- </dd>
- <dt>data</dt>
- <dd>
- Auxiliary data passed to <i>macro</i>.
- </dd>
- </dl>
- <h4>Remarks</h4>
- <div>
- This macro expands to the sequence:
- <div>
- <i>macro</i>(<i>z</i>, <i>first</i>, <i>data</i>) <i>macro</i>(<i>z</i>, <i>first</i> + <i>1</i>, <i>data</i>) ... <i>macro</i>(<i>z</i>, <i>last</i> - <i>1</i>, <i>data</i>)
- </div>
- </div>
- <div>
- The number of repetitions (i.e. <i>last</i> - <i>first</i>) must not exceed <b>BOOST_PP_LIMIT_REPEAT</b>.
- </div>
- <div>
- At certain times, it may be necessary to perform the concatenation with <b>BOOST_PP_CAT</b> rather than the preprocessor token-pasting operator.
- This happens when the <i>z</i> value is a macro invocation itself.
- It needs a delay to allow it to expand.
- The syntax in such a scenario becomes:
- <div>
- <b>BOOST_PP_CAT</b>(<b>BOOST_PP_REPEAT_FROM_TO_</b>, <i>z</i>)(<i>count</i>, <i>macro</i>, <i>data</i>).
- </div>
- </div>
- <h4>See Also</h4>
- <ul>
- <li><a href="cat.html">BOOST_PP_CAT</a></li>
- <li><a href="limit_repeat.html">BOOST_PP_LIMIT_REPEAT</a></li>
- <li><a href="repeat.html">BOOST_PP_REPEAT</a></li>
- </ul>
- <h4>Requirements</h4>
- <div>
- <b>Header:</b> <a href="../headers/repetition/repeat_from_to.html"><boost/preprocessor/repetition/repeat_from_to.hpp></a>
- </div>
- <h4>Sample Code</h4>
- <div><pre>
- #include <<a href="../headers/repetition/repeat_from_to.html">boost/preprocessor/repetition/repeat_from_to.hpp</a>>
- #define TEXT(z, n, data) n data
- #define MACRO(z, n, data) \
- ( \
- <a href="repeat_from_to_z.html">BOOST_PP_REPEAT_FROM_TO_</a> ## z( \
- 1, 4, \
- TEXT, xyz \
- ) \
- ) \
- /**/
- <a href="repeat.html">BOOST_PP_REPEAT</a>(3, MACRO, _)
- /*
- expands to:
- (1 xyz 2 xyz 3 xyz)
- (1 xyz 2 xyz 3 xyz)
- (1 xyz 2 xyz 3 xyz)
- */
- </pre></div>
- <hr size="1">
- <div style="margin-left: 0px;">
- <i>© Copyright <a href="http://www.housemarque.com" target="_top">Housemarque Oy</a> 2002</i>
- </br><i>© Copyright Paul Mensonides 2002</i>
- </div>
- <div style="margin-left: 0px;">
- <p><small>Distributed under the Boost Software License, Version 1.0. (See
- accompanying file <a href="../../../../LICENSE_1_0.txt">LICENSE_1_0.txt</a> or
- copy at <a href=
- "http://www.boost.org/LICENSE_1_0.txt">www.boost.org/LICENSE_1_0.txt</a>)</small></p>
- </div>
- </body>
- </html>
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