container_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>Set constructors & 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> > <a href= "index.html">C++ Sets</a> > <a href= "container_constructors.html">Set constructors & destructors</a> </div> <div class="name-format"> Set constructors & destructors </div> <div class="syntax-name-format"> Syntax: </div> <pre class="syntax-box"> #include <set> set(); set( const set& c ); ~set();</pre> <p>Every set has a default constructor, copy constructor, and destructor.</p> <p>The default constructor takes no arguments, creates a new instance of that set, 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 set that is a copy of the given set <em>c</em>.</p> <p>The default destructor is called when the set should be destroyed.</p> <p>For example, the following code creates a pointer to a vector of integers and then uses the default set constructor to allocate a memory for a new vector:</p> <pre class="example-code"> vector<int>* v; v = new vector<int>(); </pre> <div class="related-name-format"> Related topics: </div> <div class="related-content"> (C++ Strings) <a href="../cppstring/resize.html">resize</a> </div> </div> </td> </tr> </table></body></html>⌨️ 快捷键说明
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