3 replies to this topic

[Crane]

Why does function ::f() return the size of the variable C not the size of type C?

#include <iostream>


int C;


class C {

  private:

    int i[2];

  public:

    static int f() {

        return sizeof(C);

    }


};


int f()

{

    return sizeof(C);


}


int main()

{

   std::cout << "C::f() = " <<C::f() << ","

             << " ::f() = " <<::f() << std::endl;

}

[WingedPanther]

My guess would be that int C is defined before class C, and since sizeof can accept either, it will take the first item defined. C::f(), on the other hand, will go with what it knows best, which is class C.

[Nightracer]

WingedPanther said:

My guess would be that int C is defined before class C, and since sizeof can accept either, it will take the first item defined. C::f(), on the other hand, will go with what it knows best, which is class C.

Agree

[The_Master]

i also agree