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Library/boost/libs/preprocessor/doc/ref/array_pop_front.html

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19 дек 2024, 19:11

19 дек 2024, 19:1105db15d

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    <title>BOOST_PP_ARRAY_POP_FRONT</title>
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    <div style="margin-left:  0px;"> The <b>BOOST_PP_ARRAY_POP_FRONT</b> macro
      pops an element from the beginning of an <i>array</i>.</div>
    <h4>Usage</h4>
    <div class="code"> <b>BOOST_PP_ARRAY_POP_FRONT</b>(<i>array</i>) </div>
    <h4>Arguments</h4>
    <dl>
      <dt>array</dt>
      <dd> The <i>array</i> to pop an element from. </dd>
    </dl>
    <h4>Remarks</h4>
    <div> This macro returns <i>array</i> after removing the first
      element.&nbsp; If <i>array</i> has no elements, the result of applying
      this macro is undefined. </div>
    <div> This macro uses <b>BOOST_PP_REPEAT</b> internally.&nbsp; Therefore,
      to use the <i>z</i> parameter passed from other macros that use <b>BOOST_PP_REPEAT</b>,
      see <b>BOOST_PP_ARRAY_POP_FRONT_Z</b> </div>
    <h4>See Also</h4>
    <ul>
      <li><a href="array_pop_front_z.html">BOOST_PP_ARRAY_POP_FRONT_Z</a></li>
    </ul>
    <h4>Requirements</h4>
    <div> <b>Header:</b> &nbsp;<a href="../headers/array/pop_front.html">&lt;boost/preprocessor/array/pop_front.hpp&gt;</a>
    </div>
    <h4>Sample Code</h4>
    <div>
      <pre>#include &lt;<a href="../headers/array/pop_front.html">boost/preprocessor/array/pop_front.hpp</a>&gt;

#define ARRAY (3, (a, b, c))

<a href="array_pop_front.html">BOOST_PP_ARRAY_POP_FRONT</a>(ARRAY) // expands to (2, (b, c))
</pre></div>
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