CODEWITHSUNDEEP
c++templates
Anon
Anon

Reputation: 1354

Complex template function

I was reading about templates here http://publib.boulder.ibm.com/ when i saw this piece of code that really confused me:

template<class T> class Y { };

template<class T, int i> class X {
   public:
      Y<T> f(char[20][i]) { return x; };
      Y<T> x;
};

template<template<class> class T, class U, class V, class W, int i>
   void g( T<U> (V::*)(W[20][i]) ) { };

int main()
{
   Y<int> (X<int, 20>::*p)(char[20][20]) = &X<int, 20>::f;
   g(p);
}

Could you please explain to me what this line means?

Y<int> (X<int, 20>::*p)(char[20][20]) = &X<int, 20>::f;

I just cant grasp the meaning of it. Thanx!

Upvotes: 0

Views: 68

Answers (1)

yuri kilochek
yuri kilochek

Reputation: 13529

Y<int> (X<int, 20>::*p)(char[20][20]) = &X<int, 20>::f;

declares a member function pointer p to a member function of class X<int, 20> that accepts a pointer to array of 20 chars, and returns Y<int>. Then this pointer is initialized with member function f of class X<int, 20>

Upvotes: 3

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