map_constructors.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>Map Constructors &amp; Destructors</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++ Maps</a> &gt; <a href=    "map_constructors.html">Map Constructors &amp;    Destructors</a>  </div>  <div class="name-format">    Map Constructors &amp; Destructors  </div>  <div class="syntax-name-format">    Syntax:  </div>  <pre class="syntax-box">  #include &lt;map&gt;  map();  map( const map&amp; m );  map( iterator start, iterator end );  map( iterator start, iterator end, const key_compare&amp; cmp );  map( const key_compare&amp; cmp );  ~map();</pre>  <p>The default constructor takes no arguments, creates a new instance  of that map, and runs in <a href="../complexity.html">constant  time</a>. The default copy constructor runs in <a href=  "../complexity.html">linear time</a> and can be used to create a new  map that is a copy of the given map <em>m</em>.</p>  <p>You can also create a map that will contain a copy of the  elements between <em>start</em> and <em>end</em>, or specify a  comparison function <em>cmp</em>.  <p>The default destructor is called when the map should be  destroyed.</p>  <p>For example, the following code creates a map that associates a  string with an integer:</p>  <pre class="example-code">  struct strCmp {    bool operator()( const char* s1, const char* s2 ) const {      return strcmp( s1, s2 ) &lt; 0;    }  };  ...  map&lt;const char*, int, strCmp&gt; ages;  ages["Homer"] = 38;  ages["Marge"] = 37;  ages["Lisa"] = 8;  ages["Maggie"] = 1;  ages["Bart"] = 11;  cout &lt;&lt; "Bart is " &lt;&lt; ages["Bart"] &lt;&lt; " years old" &lt;&lt; endl;</pre>  <div class="related-name-format">    Related topics:  </div>  <div class="related-content">    <a href="map_operators.html">Map Operators</a>  </div>  </div>  </td>    </tr>  </table></body></html>

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