#include <iostream>

struct A
{
  A() {}

  A(const A& a)
  {
    std::cout << "COPY CONSTRUCTOR" << std::endl;
  }

  void operator=(const A& a)
  {
    std::cout << "ASSIGNMENT OPERATOR" << std::endl;
  }
};

int main(int argc, char** argv)
{
  A a1;

  // calls copy constructor
  // This is initialization not assignment!
  A a2 = a1;

  // calls assignment operator
  a2 = a1;

  return 0;
}