C++ - Standard library - Using the pair container

The pair container cannot be iterated.

So we can use it for example to return a double value at the end of a function.

In the snippet below we are going to use it to change the first and the second value.
This, respectively with the pair.first and pair.second methods:

#include <iostream>
#include <string>

int main()
{
  std::pair<int, std::string> myPair(1, "John");
  std::cout << "Id: " << myPair.first << " - Name: " << myPair.second << std::endl;
  myPair.first = 38;
  myPair.second = "William";
  std::cout << "Id: " << myPair.first << " - Name: " << myPair.second << std::endl;
  return 0;
}

Result:

Id: 1 - Name: John
Id: 38 - Name: William