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| <title>BOOST_PP_REPEAT_FROM_TO_z</title> |
| <link rel="stylesheet" type="text/css" href="../styles.css"> |
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| <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. |
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| <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> |
