gistfile1.txt

struct _Invoker_functor
	{	// INVOKE a function object
	template<class _Callable,
		class... _Types>
		static auto _Call(_Callable&& _Obj, _Types&&... _Args)
		-> decltype(_STD forward<_Callable>(_Obj)(
			_STD forward<_Types>(_Args)...))
		{	// INVOKE a function object
		return (_STD forward<_Callable>(_Obj)( // <=== THIS LINE
			_STD forward<_Types>(_Args)...));
		}
	};

2>D:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\include\type_traits(1398): error C2065: '_Args': undeclared identifier