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#include <iostream>
#include <vector>
 
using namespace std;
 
template< typename Self>
class A {
public:
    void foo( ) {
    	Self s;
    	s._method( s);
    }
 
protected:
    virtual  void _method( const Self & b) = 0;
};
 
class _B;
 
 
template< typename Self=_B>
class B : public A< Self> {
 
protected:
    void _method( const Self & b) {}
};
 
class _B : public B< > { };
 
int main() {
    B<>().foo();
 
	return 0;
}

prog.cpp: In instantiation of ‘void A<Self>::foo() [with Self = _B]’:
prog.cpp:31:15:   required from here
prog.cpp:25:10: error: ‘void B<Self>::_method(const Self&) [with Self = _B]’ is protected
     void _method( const Self & b) {}
          ^
prog.cpp:11:6: error: within this context
      s._method( s);
      ^

Standard output is empty