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size

Description : This function is used to return size of an unordered map.

Example :

// Demonstrates size() 
#include <iostream>
#include <unordered_map>

int main(){
    //declares an empty map. O(1)
    std::unordered_map<char, int> mymap; 

    //print size of mymap before inserting key and value in unordered_map
    std::cout << "mymap size is = " <<mymap.size()<< '\n';
    
    //inserting in to unordered_map with O(1) time on average
    mymap.insert({'A', 1});
    mymap.insert({'b', 2});
    mymap.insert({'c', 3});
  
    //print size of mymap After inserting key and value in unordered_map
    std::cout << "mymap size is = " <<mymap.size()<< '\n';

    return 0;
}

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