multimap swap() function in C++ STL
The multimap::swap() is a built-in function in C++ STL which swaps two multimap container. The contents of multimap1 are in multimap2 and contents of multimap2 are in multimap1 after swap() function is called.
Syntax:
multimap1_name.swap(multimap2_name)
Parameters: This function accepts one parameter which is to be swapped with the multimap1_name,
Return Value: The function does not returns anything.
// 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; } |
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