basics/refqual.cpp

The following code example is taken from the book
C++ Move Semantics - The Complete Guide by Nicolai M. Josuttis, Leanpub, 2020
The code is licensed under a Creative Commons Attribution 4.0 International License.

---

// raw code

#include <iostream>

class C {
public:
  void foo() const& {
    std::cout << "foo() const&\n";
  }
  void foo() && {
    std::cout << "foo() &&\n";
  }
  void foo() & {
    std::cout << "foo() &\n";
  }
  void foo() const&& {
    std::cout << "foo() const&&\n";
  }  
};

int main()
{
  C x;
  x.foo();              // calls foo() &
  C{}.foo();            // calls foo() &&
  std::move(x).foo();   // calls foo() &&
  
  const C cx;
  cx.foo();             // calls foo() const&
  std::move(cx).foo();  // calls foo() const&&
}