Pair class notes

pair Class notes
pair Is to record a pair of data
c++ Standard library
pair
first
second
pair::operator=
pair::swap

swap (pair)
get (pair)
Example ：

// accessing pairs with get
#include <utility> // std::pair, std::get
#include <iostream> // std::cout

int main () {
    
  std::pair <int,char> foo (10,'x');

  std::get<0>(foo) = 50;

  std::cout << "foo contains: ";
  std::cout << std::get<0>(foo) << " and " << std::get<1>(foo) << '\n';

  return 0;
}

More on pair library

boost library
compressed_pair
and std::pair Use almost