📄 rfind.html

📁 从www.CppReference.com打包的C++参考手册
💻 HTML
字号:
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head>  <meta name="generator" content=  "HTML Tidy for Linux/x86 (vers 1 September 2005), see www.w3.org">  <title>rfind</title>  <link href="../cppreference.css" rel="stylesheet" type="text/css"></head><body><table>  <tr>  <td>  <div class="body-content">  <div class="header-box">    <a href="../index.html">cppreference.com</a> &gt; <a href=    "index.html">C++ Strings</a> &gt; <a href="rfind.html">rfind</a>  </div>  <div class="name-format">    rfind  </div>  <div class="syntax-name-format">    Syntax:  </div>  <pre class="syntax-box">  #include &lt;string&gt;  <strong>size_type</strong> rfind( const string&amp; str, <strong>size_type</strong> index );  <strong>size_type</strong> rfind( const char* str, <strong>size_type</strong> index );  <strong>size_type</strong> rfind( const char* str, <strong>size_type</strong> index, <strong>size_type</strong> num );  <strong>size_type</strong> rfind( char ch, <strong>size_type</strong> index );</pre>  <p>The rfind() function either:</p>  <ul>    <li>returns the location of the first occurrence of <em>str</em> in    the current string, doing a reverse search from <em>index</em>,    string::npos if nothing is found,</li>    <li>returns the location of the first occurrence of <em>str</em> in    the current string, doing a reverse search from <em>index</em>,    searching at most <em>num</em> characters, string::npos if nothing    is found,</li>    <li>or returns the location of the first occurrence of <em>ch</em>    in the current string, doing a reverse search from <em>index</em>,    string::npos if nothing is found.</li>  </ul>  <p>For example, in the following code, the first call to rfind()  returns string::npos, because the target word is not within the first  8 characters of the string. However, the second call returns 9,  because the target word is within 20 characters of the beginning of  the string.</p>  <pre class="example-code">   int loc;   string s = &quot;My cat&#39;s breath smells like cat food.&quot;;   loc = s.rfind( &quot;breath&quot;, 8 );   cout &lt;&lt; &quot;The word breath is at index &quot; &lt;&lt; loc &lt;&lt; endl;   loc = s.rfind( &quot;breath&quot;, 20 );   cout &lt;&lt; &quot;The word breath is at index &quot; &lt;&lt; loc &lt;&lt; endl;           </pre>  <div class="related-name-format">    Related topics:  </div>  <div class="related-content">    <a href="find.html">find</a><br>    <a href="find_first_not_of.html">find_first_not_of</a><br>    <a href="find_first_of.html">find_first_of</a><br>    <a href="find_last_not_of.html">find_last_not_of</a><br>    <a href="find_last_of.html">find_last_of</a>  </div>  </div>  </td>    </tr>  </table></body></html>
⌨️ 快捷键说明

复制代码 Ctrl + C
搜索代码 Ctrl + F
全屏模式 F11
切换主题 Ctrl + Shift + D
显示快捷键 ?
增大字号 Ctrl + =
减小字号 Ctrl + -