c++ - Get pointer to class method with 'using' keyword -

i'm using visual studio 2010.

why can't pointer class method "upgraded" public in child class?

the following code not compile:

#include <iostream> #include <functional>  class parent { protected:     void foo() {         std::cout << "parent::foo()\n";     } };  class child : public parent { public:     //void foo() { parent::foo(); } //this compiles     using parent::foo; //this not compile }; int main() {     child c;      std::function < void () > f = std::bind(&child::foo, &c);     f();     return 0; } 

it gives error:

error c2248: 'parent::foo' : cannot access protected member declared in class 'parent' 

it compiles here.

i think forgot add c++11 option in compiler.

for example, gcc it's -std=c++11 or -std=gnu++11.

edit : seems here using alias declaration not implemented in visual studio version.

in fact, here people talks compiler bug.

the weird thing here is:

c.foo();                                                   // works fine std::function < void () > f = std::bind(&child::foo, &c);  // won't compile