C++ multimap swap()用法及代码示例

multimap::swap()是C++ STL中的内置函数，它交换两个多图容器。调用swap()函数后，multimap1的内容在multimap2中，multimap2的内容在multimap1中。

用法:

multimap1_name.swap(multimap2_name)

参数：此函数接受一个要与multimap1_name交换的参数，

返回值：该函数不返回任何内容。

// C++ function for illustration 
// multiset::swap() function 
#include <bits/stdc++.h> 
using namespace std; 
  
int main() 
{ 
  
    // initialize container 
    multimap<int, int> mp1, mp2; 
  
    // insert elements in random order 
    mp1.insert({ 2, 30 }); 
    mp1.insert({ 1, 40 }); 
  
    mp2.insert({ 10, 60 }); 
    mp2.insert({ 9, 20 }); 
  
    cout << "\nThe multimap1 before applying swap() is : \n"; 
    cout << "KEY\tELEMENT\n"; 
    for (auto itr = mp1.begin(); itr != mp1.end(); ++itr) { 
        cout << itr->first 
             << '\t' << itr->second << '\n'; 
    } 
  
    cout << "\nThe multimap2 before applying swap() is : \n"; 
    cout << "KEY\tELEMENT\n"; 
    for (auto itr = mp2.begin(); itr != mp2.end(); ++itr) { 
        cout << itr->first 
             << '\t' << itr->second << '\n'; 
    } 
  
    // performs swap operation of two multimap 
    mp1.swap(mp2); 
  
    cout << "\nThe multimap1 after applying swap() is : \n"; 
    cout << "KEY\tELEMENT\n"; 
    for (auto itr = mp1.begin(); itr != mp1.end(); ++itr) { 
        cout << itr->first 
             << '\t' << itr->second << '\n'; 
    } 
  
    cout << "\nThe multimap2 after applying swap() is : \n"; 
    cout << "KEY\tELEMENT\n"; 
    for (auto itr = mp2.begin(); itr != mp2.end(); ++itr) { 
        cout << itr->first 
             << '\t' << itr->second << '\n'; 
    } 
  
    return 0; 
}

相关用法

注：本文由纯净天空筛选整理自gopaldave大神的英文原创作品 multimap swap() function in C++ STL。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。