重载unique_ptr运算符调用make_unique

Question

I would like to add a operator to std::unique_ptr so i can add make_unique without adding make_unique to code

i would like to be able to do it something like this

namespace Window
{
    class CWindow;

    typedef std::unique_ptr<CWindow> Window;

    template<typename... Args>
    Window::operator=(Args&&... args)
    {
        return std::make_unique<CWindow>(std::forward<Args>(args)...);
    }
}

//global
Window::Window MainWindow;

//In WinMain
MainWindow = Window::CWindow("Window Name", Vector2D(10, 10), Vector2D(500, 500));

Answer 1

This is not possible. operator= must be a member function, and you cannot add your own stuff to the unique_ptr class.

Even if it were possible, it would be a bad idea because:

• it would break the behaviour of valid use cases of operator= for unique_ptr
• people reading the code will not expect this unexpected behaviour

You could derive from unique_ptr and overload operator= in the derived class, but again it will confuse anyone reading the code (including yourself probably, if you revisited the project after a period of time).

As suggested in comments, it would be better just to make some named function.