📄 erase.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>erase</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++ Lists</a> > <a href="erase.html">erase</a> </div> <div class="name-format"> erase </div> <div class="syntax-name-format"> Syntax: </div> <pre class="syntax-box"> #include <list> iterator erase( iterator loc ); iterator erase( iterator start, iterator end );</pre> <p>The erase() function either deletes the element at location <em>loc</em>, or deletes the elements between <em>start</em> and <em>end</em> (including <em>start</em> but not including <em>end</em>). The return value is the element after the last element erased.</p> <p>The first version of erase (the version that deletes a single element at location <em>loc</em>) runs in <a href= "../complexity.html">constant time</a> for lists and <a href= "../complexity.html">linear time</a> for vectors, dequeues, and strings. The multiple-element version of erase always takes <a href= "../complexity.html">linear time</a>.</p> <p>For example:</p> <pre class="example-code"> // Create a vector, load it with the first ten characters of the alphabet vector<char> alphaVector; for( int i=0; i < 10; i++ ) { alphaVector.push_back( i + 65 ); } int size = alphaVector.size(); vector<char>::iterator startIterator; vector<char>::iterator tempIterator; for( int i=0; i < size; i++ ) { startIterator = alphaVector.begin(); alphaVector.erase( startIterator ); // Display the vector for( tempIterator = alphaVector.begin(); tempIterator != alphaVector.end(); tempIterator++ ) { cout << *tempIterator; } cout << endl; } </pre> <p>That code would display the following output:</p> <pre class="example-code"> BCDEFGHIJ CDEFGHIJ DEFGHIJ EFGHIJ FGHIJ GHIJ HIJ IJ J </pre> <p>In the next example, erase() is called with two iterators to delete a range of elements from a vector:</p> <pre class="example-code"> // create a vector, load it with the first ten characters of the alphabet vector<char> alphaVector; for( int i=0; i < 10; i++ ) { alphaVector.push_back( i + 65 ); } // display the complete vector for( int i = 0; i < alphaVector.size(); i++ ) { cout << alphaVector[i]; } cout << endl; // use erase to remove all but the first two and last three elements // of the vector alphaVector.erase( alphaVector.begin()+2, alphaVector.end()-3 ); // display the modified vector for( int i = 0; i < alphaVector.size(); i++ ) { cout << alphaVector[i]; } cout << endl; </pre> <p>When run, the above code displays:</p> <pre class="example-code"> ABCDEFGHIJ ABHIJ </pre> <div class="related-name-format"> Related topics: </div> <div class="related-content"> <a href="clear.html">clear</a><br> <a href="insert.html">insert</a><br> <a href="pop_back.html">pop_back</a><br> <a href="pop_front.html">pop_front</a><br> <a href="remove.html">remove</a><br> <a href="remove_if.html">remove_if</a> </div> </div> </td> </tr> </table></body></html>⌨️ 快捷键说明
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