#include <iostream>    

struct A {
   int x;
   A(int xx) : x(xx) { std::cout << "A(int)\n"; }
   A(const A &b) : x(b.x) { std::cout << "A(const A&)\n"; }
   const A & operator=(const A &b) { 
      x = b.x; 
      std::cout << "operator=\n";
      return *this; 
   }
   A operator+(const A &b) { 
      A a(x + b.x); 
      std::cout << "operator+\n"; 
      return a;
   }
   ~A() { std::cout << "~A()\n"; }
};

int main()
{
    A a(10), b(20), c(0);
    std::cout << "------------\n";
    c = a + b;
    return 0;
}