The multimap clear() function is an inbuilt function in C++ STL which is used to remove all elements from the multimap container (which are destroyed), leaving the container with a size of 0.
Syntax :
mymultimap_name.clear()
Parameters: This function does not take any arguments.
Return Value: This function does not returns anything. The return type of the function is void. It just empties the whole container.
Below program illustrate the multimap::clear() function in C++:
C++
// CPP program to illustrate the// multimap::clear() function#include <cstring>#include <iostream>#include <map>using namespace std;int main(){ // Creating multimap of string and int multimap<string, int> mymultimap; // Inserting 3 Items with their value // using insert function mymultimap.insert(pair<string, int>("Item1", 10)); mymultimap.insert(pair<string, int>("Item2", 20)); mymultimap.insert(pair<string, int>("Item3", 30)); cout << "Size of the multimap before using " << "clear function : "; cout << mymultimap.size() << '\n'; // Removing all the elements // present in the multimap mymultimap.clear(); cout << "Size of the multimap after using" << " clear function : "; cout << mymultimap.size() << '\n'; return 0;} |
Output
Size of the multimap before using clear function : 3 Size of the multimap after using clear function : 0
Time Complexity: O(N), where N is the total number of elements in multimap.
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