break Protected member access解决方法

break Protected member access

C/C++ code

#include "stdafx.h"// Library codetemplate<class DerivedT>class Base{private:    struct accessor : DerivedT    //DerivedT是派生类,其中成员函数do_foo是个保护函数    {        static int foo(DerivedT& derived)        {            int (DerivedT::*fn)() = &accessor::do_foo;    //获得父类do_foo的函数地址？？？？？             return (derived.*fn)();   //获得地址后，然后用derived这个对象来调用        }    };public:    DerivedT& derived() {        return static_cast<DerivedT&>(*this); }    int foo()    {        return accessor::foo(derived());     }};