devdocs/c/variadic%2Fva_list.html


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23

    <h1 id="firstHeading" class="firstHeading">va_list</h1>            <table class="t-dcl-begin"> <tr class="t-dsc-header"> <th> Defined in header <code>&lt;stdarg.h&gt;</code> </th> <th> </th> <th> </th> </tr> <tr class="t-dcl"> <td class="t-dcl-nopad"> <pre data-language="c">/* unspecified */ va_list;</pre>
</td> <td class="t-dcl-nopad"> </td> <td class="t-dcl-nopad"> </td> </tr>  </table> <p><code>va_list</code> is a complete object type suitable for holding the information needed by the macros <code>va_start</code>, <code>va_copy</code>, <code>va_arg</code>, and <code>va_end</code>.</p>
<p>If a <code>va_list</code> instance is created, passed to another function, and used via <code>va_arg</code> in that function, then any subsequent use in the calling function should be preceded by a call to <code>va_end</code>.</p>
<p>It is legal to pass a pointer to a <code>va_list</code> object to another function and then use that object after the function returns.</p>
<h3 id="References"> References</h3>  <ul>
<li> C11 standard (ISO/IEC 9899:2011): </li>
<ul><li> 7.16/3 Variable arguments &lt;stdarg.h&gt; (p: 269) </li></ul>
<li> C99 standard (ISO/IEC 9899:1999): </li>
<ul><li> 7.15/3 Variable arguments &lt;stdarg.h&gt; (p: 249) </li></ul>
<li> C89/C90 standard (ISO/IEC 9899:1990): </li>
<ul><li> 4.8 VARIABLE ARGUMENTS &lt;stdarg.h&gt; </li></ul>
</ul>         <h3 id="See_also"> See also</h3> <table class="t-dsc-begin"> <tr class="t-dsc"> <td> <div><a href="va_arg" title="c/variadic/va arg"> <span class="t-lines"><span>va_arg</span></span></a></div> </td> <td> accesses the next variadic function argument <br> <span class="t-mark">(function macro)</span>  </td>
</tr> <tr class="t-dsc"> <td> <div><a href="va_copy" title="c/variadic/va copy"> <span class="t-lines"><span>va_copy</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-c99">(C99)</span></span></span></div> </td> <td> makes a copy of the variadic function arguments <br> <span class="t-mark">(function macro)</span>  </td>
</tr> <tr class="t-dsc"> <td> <div><a href="va_end" title="c/variadic/va end"> <span class="t-lines"><span>va_end</span></span></a></div> </td> <td> ends traversal of the variadic function arguments <br> <span class="t-mark">(function macro)</span>  </td>
</tr> <tr class="t-dsc"> <td> <div><a href="va_start" title="c/variadic/va start"> <span class="t-lines"><span>va_start</span></span></a></div> </td> <td> enables access to variadic function arguments <br> <span class="t-mark">(function macro)</span>  </td>
</tr> <tr class="t-dsc"> <td colspan="2"> <span><a href="https://en.cppreference.com/w/cpp/utility/variadic/va_list" title="cpp/utility/variadic/va list">C++ documentation</a></span> for <code>va_list</code> </td>
</tr> </table>            <div class="_attribution">
  <p class="_attribution-p">
    &copy; cppreference.com<br>Licensed under the Creative Commons Attribution-ShareAlike Unported License v3.0.<br>
    <a href="https://en.cppreference.com/w/c/variadic/va_list" class="_attribution-link">https://en.cppreference.com/w/c/variadic/va_list</a>
  </p>
</div>