#include <iostream>
using namespace std;
 
template<class T>
class Test;
 
 
class BeMyFriend
{
	public:
template<class T> 
int checkprivacy(const Test<T> areyoumyfriend)
{
	std::cout << "lemme check " << areyoumyfriend.mything << std::endl;
};
BeMyFriend& operator=(const BeMyFriend& );
BeMyFriend(){std::cout << "works " << std::endl;};
};
 
template<class T>
class Test
{
 private:
 string mything= "here it is";
 public:
 friend T& T::operator=(const T&); //Works fine, no error
 friend T&::T(const T&); //error: prototype for 'BeMyFriend::BeMyFriend(const BeMyFriend&)' does not match any in class 'BeMyFriend'
 template<class D=T>
 friend int T::checkprivacy(const Test<D>);
 
};
 
 
 
 
 
int main()
{
 BeMyFriend yourfriend;
 Test<BeMyFriend> hmm;
 yourfriend.checkprivacy(hmm);
 
 return 0;
}
 

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