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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>C++ Maps</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++ Maps</a> </div> <div class="name-format"> C++ Maps </div> <p>C++ Maps are sorted associative containers that contain unique key/value pairs. For example, you could create a map that associates a <a href="../cppstring/index.html">string</a> with an integer, and then use that map to associate the number of days in each month with the name of each month.</p> <p><a href="all.html">Display all entries</a> for C++ Maps on one page, or view entries individually:</p> <table class="category-table"> <tr class="category-table-tr-2"> <td class="category-table-td"><a href= "map_constructors.html">Map constructors & destructors</a></td> <td class="category-table-td">default methods to allocate, copy, and deallocate maps</td> </tr> <tr class="category-table-tr-1"> <td class="category-table-td"><a href="map_operators.html">Map operators</a></td> <td class="category-table-td">assign, compare, and access elements of a map</td> </tr> <tr class="category-table-tr-2"> <td class="category-table-td"><a href="begin.html">begin</a></td> <td class="category-table-td">returns an iterator to the beginning of the map</td> </tr> <tr class="category-table-tr-1"> <td class="category-table-td"><a href="clear.html">clear</a></td> <td class="category-table-td">removes all elements from the map</td> </tr> <tr class="category-table-tr-2"> <td class="category-table-td"><a href="count.html">count</a></td> <td class="category-table-td">returns the number of elements matching a certain key</td> </tr> <tr class="category-table-tr-1"> <td class="category-table-td"><a href="empty.html">empty</a></td> <td class="category-table-td">true if the map has no elements</td> </tr> <tr class="category-table-tr-2"> <td class="category-table-td"><a href="end.html">end</a></td> <td class="category-table-td">returns an iterator just past the last element of a map</td> </tr> <tr class="category-table-tr-1"> <td class="category-table-td"><a href= "equal_range.html">equal_range</a></td> <td class="category-table-td">returns iterators to the first and just past the last elements matching a specific key</td> </tr> <tr class="category-table-tr-2"> <td class="category-table-td"><a href="erase.html">erase</a></td> <td class="category-table-td">removes elements from a map</td> </tr> <tr class="category-table-tr-1"> <td class="category-table-td"><a href="find.html">find</a></td> <td class="category-table-td">returns an iterator to specific elements</td> </tr> <tr class="category-table-tr-2"> <td class="category-table-td"><a href= "insert.html">insert</a></td> <td class="category-table-td">insert items into a map</td> </tr> <tr class="category-table-tr-1"> <td class="category-table-td"><a href= "key_comp.html">key_comp</a></td> <td class="category-table-td">returns the function that compares keys</td> </tr> <tr class="category-table-tr-2"> <td class="category-table-td"><a href= "lower_bound.html">lower_bound</a></td> <td class="category-table-td">returns an iterator to the first element greater than or equal to a certain value</td> </tr> <tr class="category-table-tr-1"> <td class="category-table-td"><a href= "max_size.html">max_size</a></td> <td class="category-table-td">returns the maximum number of elements that the map can hold</td> </tr> <tr class="category-table-tr-2"> <td class="category-table-td"><a href= "rbegin.html">rbegin</a></td> <td class="category-table-td">returns a <a href= "../iterators.html">reverse_iterator</a> to the end of the map</td> </tr> <tr class="category-table-tr-1"> <td class="category-table-td"><a href="rend.html">rend</a></td> <td class="category-table-td">returns a <a href= "../iterators.html">reverse_iterator</a> to the beginning of the map</td> </tr> <tr class="category-table-tr-2"> <td class="category-table-td"><a href="size.html">size</a></td> <td class="category-table-td">returns the number of items in the map</td> </tr> <tr class="category-table-tr-1"> <td class="category-table-td"><a href="swap.html">swap</a></td> <td class="category-table-td">swap the contents of this map with another</td> </tr> <tr class="category-table-tr-2"> <td class="category-table-td"><a href= "upper_bound.html">upper_bound</a></td> <td class="category-table-td">returns an iterator to the first element greater than a certain value</td> </tr> <tr class="category-table-tr-1"> <td class="category-table-td"><a href= "value_comp.html">value_comp</a></td> <td class="category-table-td">returns the function that compares values</td> </tr> </table> </div> </td> </tr> </table></body></html>⌨️ 快捷键说明
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