1 | <html> |
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2 | <head> |
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3 | <title>BOOST_PP_REPEAT</title> |
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4 | <link rel="stylesheet" type="text/css" href="../styles.css"> |
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5 | </head> |
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6 | <body> |
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7 | <div style="margin-left: 0px;"> |
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8 | The <b>BOOST_PP_REPEAT</b> macro represents a fast horizontal repetition construct. |
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9 | </div> |
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10 | <h4>Usage</h4> |
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11 | <div class="code"> |
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12 | <b>BOOST_PP_REPEAT</b>(<i>count</i>, <i>macro</i>, <i>data</i>) |
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13 | </div> |
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14 | <h4>Arguments</h4> |
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15 | <dl> |
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16 | <dt>count</dt> |
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17 | <dd> |
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18 | The number of repetitious calls to <i>macro</i>. |
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19 | Valid values range from <i>0</i> to <b>BOOST_PP_LIMIT_REPEAT</b>. |
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20 | </dd> |
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21 | <dt>macro</dt> |
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22 | <dd> |
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23 | A ternary operation of the form <i>macro</i>(<i>z</i>, <i>n</i>, <i>data</i>). |
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24 | This macro is expanded by <b>BOOST_PP_REPEAT</b> with the next available repetition depth, |
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25 | the current repetition number, and the auxiliary <i>data</i> argument. |
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26 | </dd> |
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27 | <dt>data</dt> |
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28 | <dd> |
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29 | Auxiliary data passed to <i>macro</i>. |
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30 | </dd> |
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31 | </dl> |
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32 | <h4>Remarks</h4> |
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33 | <div> |
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34 | This macro expands to the sequence: |
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35 | <div> |
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36 | <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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37 | </div> |
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38 | </div> |
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39 | <div> |
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40 | The <i>z</i> value that is passed to <i>macro</i> represents the next available repetition dimension. |
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41 | 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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42 | 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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43 | </div> |
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44 | <div> |
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45 | To directly use this <i>z</i> value, rather than simply passing it to another macro, see <b>BOOST_PP_REPEAT_<i>z</i></b>. |
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46 | </div> |
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47 | <div> |
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48 | Previously, this macro could not be used recursively inside <b>BOOST_PP_REPEAT</b>. |
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49 | This limitation no longer exists, as the library can automatically detect the next available repetition depth. |
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50 | </div> |
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51 | <h4>See Also</h4> |
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52 | <ul> |
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53 | <li><a href="limit_repeat.html">BOOST_PP_LIMIT_REPEAT</a></li> |
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54 | <li><a href="repeat_z.html">BOOST_PP_REPEAT_<i>z</i></a></li> |
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55 | </ul> |
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56 | <h4>Requirements</h4> |
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57 | <div> |
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58 | <b>Header:</b> <a href="../headers/repetition/repeat.html"><boost/preprocessor/repetition/repeat.hpp></a> |
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59 | </div> |
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60 | <h4>Sample Code</h4> |
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61 | <div><pre> |
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62 | #include <<a href="../headers/repetition/repeat.html">boost/preprocessor/repetition/repeat.hpp</a>> |
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63 | |
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64 | #define DECL(z, n, text) text ## n = n; |
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65 | |
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66 | <a href="repeat.html">BOOST_PP_REPEAT</a>(5, DECL, int x) |
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67 | </pre></div> |
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68 | <hr size="1"> |
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69 | <div style="margin-left: 0px;"> |
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70 | <i>© Copyright <a href="http://www.housemarque.com" target="_top">Housemarque Oy</a> 2002</i> |
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71 | </br><i>© Copyright Paul Mensonides 2002</i> |
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72 | </div> |
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73 | <div style="margin-left: 0px;"> |
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74 | <p><small>Distributed under the Boost Software License, Version 1.0. (See |
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75 | accompanying file <a href="../../../../LICENSE_1_0.txt">LICENSE_1_0.txt</a> or |
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76 | copy at <a href= |
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77 | "http://www.boost.org/LICENSE_1_0.txt">www.boost.org/LICENSE_1_0.txt</a>)</small></p> |
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78 | </div> |
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79 | </body> |
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80 | </html> |
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