C++ function pointer (class member) to non-static member function

by 
 class A{
    public:
        typedef int (A::*method)();

        method p;
        A(){
            p = &A::foo;
            (this->*p)(); // <- trick 1, inner call
        }

        int foo(){
            printf("foo\n");
            return 0;
        }
    };

    void main()
    {
        A a;
        (a.*a.p)(); // <- trick 2, outer call
    }

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