// 
// Spezialized version of swap for data type "MyType"
// swaps only value, not status
// 
#include<iostream>

class MyType
{
public:
  bool status;
  int value;
};

namespace std 
{
  template<> // specialization
  void swap<MyType>(MyType& a,MyType& b) noexcept (true)
  {
    std::swap(a.value,b.value); // swap only values
  }
}

int main()
{
  using std::cout;
  MyType x;
  x.status = true;
  x.value = 11111;
  MyType y;
  y.status = false;
  y.value = 22222;

  cout<<"before: x   "<<x.status<<" "<<x.value<<"\n";
  cout<<"before: y   "<<y.status<<" "<<y.value<<"\n";
  std::swap(x,y);   // without specialization this would swap *everything* in x and y 
  cout<<"after : x   "<<x.status<<" "<<x.value<<"\n";
  cout<<"after : y   "<<y.status<<" "<<y.value<<"\n";
}