?? explicit.html
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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> > <a href= "index.html">C/C++ Keywords</a> > <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>?? 快捷鍵說明
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