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+    <h1 id="firstHeading" class="firstHeading">wcsspn</h1>            <table class="t-dcl-begin"> <tr class="t-dsc-header"> <th> Defined in header <code>&lt;wchar.h&gt;</code> </th> <th> </th> <th> </th> </tr> <tr class="t-dcl"> <td> <pre data-language="c">size_t wcsspn( const wchar_t* dest, const wchar_t* src );</pre>
+</td> <td class="t-dcl-nopad"> </td> <td> <span class="t-mark-rev t-since-c95">(since C95)</span> </td> </tr>  </table> <p>Returns the length of the maximum initial segment of the wide string pointed to by <code>dest</code>, that consists of only the characters found in wide string pointed to by <code>src</code>.</p>
+<h3 id="Parameters"> Parameters</h3> <table class="t-par-begin"> <tr class="t-par"> <td> dest </td> <td> - </td> <td> pointer to the null-terminated wide string to be analyzed </td>
+</tr> <tr class="t-par"> <td> src </td> <td> - </td> <td> pointer to the null-terminated wide string that contains the characters to search for </td>
+</tr>
+</table> <h3 id="Return_value"> Return value</h3> <p>The length of the maximum initial segment that contains only characters from wide string pointed to by <code>src</code></p>
+<h3 id="Example"> Example</h3> <div class="t-example"> <div class="c source-c"><pre data-language="c">#include &lt;locale.h&gt;
+#include &lt;wchar.h&gt;
+ 
+int main(void)
+{
+    wchar_t dest[] = L"白猫 黑狗 甲虫";
+    const wchar_t src[] = L" 狗猫 白黑 ";
+    const size_t len = wcsspn(dest, src);
+    dest[len] = L'\0'; /* terminates the segment to print it out */
+ 
+    setlocale(LC_ALL, "en_US.utf8");
+    wprintf(L"The length of maximum initial segment is %td.\n"
+            L"The segment is \"%ls\".\n", len, dest);
+}</pre></div> <p>Output:</p>
+<div class="text source-text"><pre data-language="c">The length of maximum initial segment is 6.
+The segment is "白猫 黑狗 ".</pre></div> </div> <h3 id="References"> References</h3>  <ul>
+<li> C11 standard (ISO/IEC 9899:2011): </li>
+<ul><li> 7.29.4.5.5 The wcsspn function (p: 436) </li></ul>
+<li> C99 standard (ISO/IEC 9899:1999): </li>
+<ul><li> 7.24.4.5.5 The wcsspn function (p: 382) </li></ul>
+</ul>      <h3 id="See_also"> See also</h3> <table class="t-dsc-begin"> <tr class="t-dsc"> <td> <div><a href="wcscspn" title="c/string/wide/wcscspn"> <span class="t-lines"><span>wcscspn</span></span></a></div>
+<div><span class="t-lines"><span><span class="t-mark-rev t-since-c95">(C95)</span></span></span></div> </td> <td> returns the length of the maximum initial segment that consists <br> of only the wide chars <i>not</i> found in another wide string <br> <span class="t-mark">(function)</span>  </td>
+</tr> <tr class="t-dsc"> <td> <div><a href="wcspbrk" title="c/string/wide/wcspbrk"> <span class="t-lines"><span>wcspbrk</span></span></a></div>
+<div><span class="t-lines"><span><span class="t-mark-rev t-since-c95">(C95)</span></span></span></div> </td> <td> finds the first location of any wide character in one wide string, in another wide string <br> <span class="t-mark">(function)</span>  </td>
+</tr> <tr class="t-dsc"> <td colspan="2"> <span><a href="https://en.cppreference.com/w/cpp/string/wide/wcsspn" title="cpp/string/wide/wcsspn">C++ documentation</a></span> for <code>wcsspn</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/string/wide/wcsspn" class="_attribution-link">https://en.cppreference.com/w/c/string/wide/wcsspn</a>
+  </p>
+</div>