Why is Copy constructor being called only when we return *this?

Question

Class Cents(){  
 int m_val;  
 public:  
  Cents(int x=0){ cout<<\"Constructor\";}
  Cents(const Cents& src){ cout<<\"Copy constructor\"}
  Cents Ad         


        

Answer 1

This happens because most of the compilers perform Return Value Optimization (aka RVO) to save on copying.