std::multimap::operator=

 

C++

语言

概念

实用工具库

字符串库

集装箱库

算法库

迭代器库

Numerics库

输入/输出库

本地化库

正则表达式库 （C++11）

原子操作库 （C++11）

线程的支持库 （C++11）

 

容器库

array （C++11）

vector

deque

forward_list （C++11）

list

set

multiset

map

multimap

unordered_set （C++11）

unordered_multiset （C++11）

unordered_map （C++11）

unordered_multimap （C++11）

stack

queue

priority_queue

 

std::multimap

成员函数 Original: Member functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

multimap::multimap

multimap::~multimap

multimap::operator=

multimap::get_allocator

迭代器 Original: Iterators The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

multimap::begin multimap::cbegin （C++11）

multimap::end multimap::cend （C++11）

multimap::rbegin multimap::crbegin （C++11）

multimap::rend multimap::crend （C++11）

容量 Original: Capacity The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

multimap::erase

multimap::size

multimap::max_size

修饰符 Original: Modifiers The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

multimap::clear

multimap::insert

multimap::emplace （C++11）

multimap::emplace_hint （C++11）

multimap::erase

multimap::swap

查找 Original: Lookup The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

multimap::count

multimap::find

multimap::equal_range

multimap::lower_bound

multimap::upper_bound

观察员 Original: Observers The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

multimap::key_comp

multimap::value_comp

 

multimap& operator=( const multimap& other );	(1)
multimap& operator=( multimap&& other );	(2)	（C++11 起）

替换该容器的内容.

Original:

Replaces the contents of the container.

The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

1)

复制赋值操作者。与other的内容的副本的内容替换.

Original:

Copy assignment operator. Replaces the contents with a copy of the contents of other.

The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

2)

将赋值运算符。的other使用移动语义（即移动中的数据otherother到这个容器中）的内容替换。 other是有效的，但是未指定状态之后.

Original:

Move assignment operator. Replaces the contents with those of other using move semantics (i.e. the data in other is moved from other into this container). other is in valid, but unspecified state afterwards.

The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

参数

other

-

另一个容器被用作源 Original: another container to be used as source The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

返回值

*this

复杂性

1)

在所述容器的大小线性.

Original:

Linear in the size of the container.

The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

2)

恒定

Original:

Constant.

The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

为例

下面的代码使用：分配一个std::multimap：

Original:

The following code uses to assign one std::multimap to another:

The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

#include <map>
#include <iostream>
 
void display_sizes(const std::multimap<int, int> &nums1,
                   const std::multimap<int, int> &nums2,
                   const std::multimap<int, int> &nums3)
{
    std::cout << "nums1: " << nums1.size()
              << " nums2: " << nums2.size()
              << " nums3: " << nums3.size() << '\n';
}
 
int main()
{
    std::multimap<int, int> nums1 {{3, 1}, {4, 1}, {5, 9}};
    std::multimap<int, int> nums2;
    std::multimap<int, int> nums3;
 
    std::cout << "Initially:\n";
    display_sizes(nums1, nums2, nums3);
 
    // copy assignment copies data from nums1 to nums2
    nums2 = nums1;
 
    std::cout << "After assigment:\n";
    display_sizes(nums1, nums2, nums3);
 
    // move assignment moves data from nums1 to nums3,
    // modifying both nums1 and nums3
    nums3 = std::move(nums1);
 
    std::cout << "After move assigment:\n";
    display_sizes(nums1, nums2, nums3);
}

Output:

Initially:
nums1: 4 nums2: 0 nums3: 0
After assigment:
nums1: 4 nums2: 4 nums3: 0
After move assigment:
nums1: 0 nums2: 4 nums3: 4

另请参阅

(constructor)	构建multimap Original: constructs the multimap The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. （公共成员函数）