unordered_multimap swap() 函数在 C++ STL 中
C++ STL 中的 unordered_multimap swap() 函数用于将一个多重映射中的元素交换到另一个大小和类型相同的元素。
算法
Begin Declaring two empty map container m, m1. Insert some values in both m, m1 map containers. Perform swap() function to swap the values of m, m1 map containers. Printing the swapped values of m map container. Printing the swapped values of m1 map container. End.
示例代码
#include<iostream> #include <bits/stdc++.h> using namespace std; int main() { unordered_map<char, int> m,m1; // declaring m, m1 as empty map container m.insert (pair<char, int>('b', 10)); //inserting values in map container m.insert (pair<char, int>('c',30)); m.insert (pair<char, int>('d',40)); m1.insert (pair<char, int>('a', 20)); m1.insert (pair<char, int>('e',70)); m1.insert (pair<char, int>('f',60)); m.swap(m1); // swapping the values of two map container. cout << "\n Key and values of 1st set are:"; for (auto it = m.begin(); it != m.end(); it++) { cout << "{" << it->first << ", " << it->second << "} "; // printing the swapped values of m map container } cout << "\n Key and values of 2nd set are:"; // printing the swapped values of m1 map container for (auto it = m1.begin(); it != m1.end(); it++) { cout << "{" << it->first << ", " << it->second << "} "; } return 0; }
输出
Key and values of 1st set are: {f, 60} {a, 20} {e, 70} Key and values of 2nd set are: {d, 40} {b, 10} {c, 30}.
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