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    <title>BOOST_PP_FOR_r</title>
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    <div style="margin-left:  0px;"> The <b>BOOST_PP_FOR_<i>r</i></b> macro
      represents a reentry into the <b>BOOST_PP_FOR</b> repetition construct. </div>
    <h4>Usage</h4>
    <div class="code"> <b>BOOST_PP_FOR_</b> ## <i>r</i>(<i>state</i>, <i>pred</i>,
      <i>op</i>, <i>macro</i>) </div