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- <title>BOOST_PP_REPEAT_FROM_TO</title>
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- <div style="margin-left: 0px;">
- The <b>BOOST_PP_REPEAT_FROM_TO</b> macro represents a fast horizontal repetition construct.
- </div>
- <h4>Usage</h4>
- <div class="code">
- <b>BOOST_PP_REPEAT_FROM_TO</b>(<i>first</i>, <i>last</i>, <i>macro</i>, <i>data</i>)
- </div>
- <h4>Arguments</h4>
- <dl>
- <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>
- The <i>z</i> value that is passed to <i>macro</i> represents the next available repetition dimension.
- 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>.
- 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.
- </div>
- <div>
- To directly use this <i>z</i> value, rather than simply passing it to another macro, see <b>BOOST_PP_REPEAT_FROM_TO_<i>z</i></b>.
- </div>
- <div>
- Previously, this macro could not be used recursively inside <b>BOOST_PP_REPEAT</b>.
- This limitation no longer exists, as the library can automatically detect the next available repetition depth.
- </div>
- <div>
- This macro also uses <b>BOOST_PP_WHILE</b>.
- Because of this, there are also two variants of this macro for ideal reentrance into <b>BOOST_PP_WHILE</b>,
- <b>BOOST_PP_REPEAT_FROM_TO_D</b> and <b>BOOST_PP_REPEAT_FROM_TO_D_<i>z</i>.
- </div>
- <h4>See Also</h4>
- <ul>
- <li><a href="limit_mag.html">BOOST_PP_LIMIT_MAG</a></li>
- <li><a href="limit_repeat.html">BOOST_PP_LIMIT_REPEAT</a></li>
- <li><a href="repeat_from_to_d.html">BOOST_PP_REPEAT_FROM_TO_D</a></li>
- <li><a href="repeat_from_to_d_z.html">BOOST_PP_REPEAT_FROM_TO_D_<i>z</i></a></li>
- <li><a href="repeat_from_to_z.html">BOOST_PP_REPEAT_FROM_TO_<i>z</i></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/cat.html">boost/preprocessor/cat.hpp</a>>
- #include <<a href="../headers/repetition/repeat_from_to.html">boost/preprocessor/repetition/repeat_from_to.hpp</a>>
- #define DECL(z, n, text) <a href="cat.html">BOOST_PP_CAT</a>(text, n) = n;
- <a href="repeat_from_to.html">BOOST_PP_REPEAT_FROM_TO</a>(5, 10, DECL, int x)
- /*
- expands to:
- int x5 = 5; int x6 = 6; int x7 = 7;
- int x8 = 8; int x9 = 9;
- */
- </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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