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Showing content from https://www.tutorialspoint.com/cpp_standard_library/cpp_map_erase_key.htm below:

C++ Map Erase Key Example

The C++ function std::map::erase() removes mapped value associated with key k.

Following is the declaration for std::map::erase() function form std::map header.

size_type erase (const key_type& k);

size_type erase (const key_type& k);

k − Key of the element to be removed.

Returns number of elements removed.

Throws same exception which is thrown by the Compare object.

Logarithmic i.e. log(n)

The following example shows the usage of std::map::erase() function.

#include <iostream>
#include <map>

using namespace std;

int main(void) {
   /* Initializer_list constructor */
   map<char, int> m = {
            {'a', 1},
            {'b', 2},
            {'c', 3},
            {'d', 4},
            {'e', 5},
            };

   cout << "Map contains following elements before erase operation" << endl;

   for (auto it = m.begin(); it != m.end(); ++it)
      cout << it->first << " = " << it->second << endl;

   m.erase('a');

   cout << "Map contains following elements after erase operation" << endl;

   for (auto it = m.begin(); it != m.end(); ++it)
      cout << it->first << " = " << it->second << endl;

   return 0;
}

Let us compile and run the above program, this will produce the following result −

Map contains following elements before erase operation
a = 1
b = 2
c = 3
d = 4
e = 5
Map contains following elements after erase operation
b = 2
c = 3
d = 4
e = 5

map.htm

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