Copy constructors and Assignment Operators

Question

I wrote the following program to test when the copy constructor is called and when the assignment operator is called:

#include 

class Test
{
public:
    T         


        

Answer 1

Your first set is according to the C++ standard, and not due to some optimization.

Section 12.8 ([class.copy]) of the C++ standard gives a similar example:

class X {
    // ...
public:
    X(int);
    X(const X&, int = 1);
};

X a(1);     // calls X(int);
X b(a, 0);  // calls X(const X&, int);
X c = b;    // calls X(const X&, int);

The last line would be the one matching your case.