C++ copy constructor invocation

Question

As far as i know, a copy constructor is invoked in the following scenarios :

1) Pass by value
2) Return by value
3) When you create and initialize a new obje         


        

Answer 1

In your exampe the structure is small enough therefore it is passed through a register. The generated code is similar to Return value optimization. Construct a more complicated example, and you'll see the behavior expected.