explicit.html

来自「从www.CppReference.com打包的C++参考手册」· HTML 代码 · 共 60 行

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<!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>explicit</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/C++ Keywords</a> &gt; <a href=    "explicit.html">explicit</a>  </div>  <div class="name-format">    explicit  </div>  <p>When a constructor is specified as explicit, no automatic  conversion will be used with that constructor -- but parameters passed to the constructor may still be converted.  For example:</p>  <pre class="example-code">  struct foo {    explicit foo( int a )      : a_( a )    { }    int a_;  };  int bar( const foo & f ) {    return f.a_;   }  bar( 1 );  // fails because an implicit conversion from int to foo             // is forbidden by explicit.  bar( foo( 1 ) );  // works -- explicit call to explicit constructor.  bar( foo( 1.0 ) );  // works -- explicit call to explicit constructor                      // with automatic conversion from float to int.</pre>  </div>  </td>    </tr>  </table></body></html>

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