ifndef PROBLEMEXAMPLE_HPP define PROBLEMEXAMPLE_HPP template class str

  • Anonymous
  • C++
  • 27 May 2014 
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#ifndef PROBLEMEXAMPLE_HPP

#define PROBLEMEXAMPLE_HPP



template<class T>

struct Traits{};



template <class P>

class A;



template <class P>

typename Traits<A<P> >::result_type

f(A<P>& a);



template <class P>

class A{

    int val;

    typedef double result_type;



    friend struct Traits<A<P> >;



    friend

    typename Traits<A<P> >::result_type

    (::f<>)(A<P>& a);

};



template<class P>

struct Traits<A<P> >{

    typedef typename A<P>::result_type result_type;

};



template <class P>

typename Traits<A<P> >::result_type

f(A<P>& a){

    return a.val;

}



#endif // PROBLEMEXAMPLE_HPP
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