How to update std::map after using the find method?

Question

How to update the value of a key in std::map after using the find method?

I have a map and iterator declaration like this:

Answer 1

If you already know the key, you can directly update the value at that key using m[key] = new_value

Here is a sample code that might help:

map m;

for(int i=0; i<5; i++)
    m[i] = i;

for(auto it=m.begin(); it!=m.end(); it++)
    cout<second<<" ";
//Output: 0 1 2 3 4

m[4] = 7;  //updating value at key 4 here

cout<<"\n"; //Change line

for(auto it=m.begin(); it!=m.end(); it++)
    cout<second<<" ";
// Output: 0 1 2 3 7