friend function & template

friend void show_test<>(test<T>&);

// Don't forget to include headers so we can reproduce the example!#include <vector>#include <iostream>using namespace std; // Blehtemplate<class T>class test{	vector<int> v;public:	test() : v(10,1) {}	// Note the additional syntax making the template statement explicit	template <typename T> friend void show_test(test<T>&);};// Firstly this function shouldn't be a free function; it should be a "Report" member function of testtemplate<class T>void show_test(test<T>& t){	// Firstly tidying up the loop the way you wrote it	// How do you know "i" is an unsigned short?	for(unsigned short i = 0; i < t.v.size(); ++i)	// We are assuming v will be a vector<int>, what if you change the test class and forget to change this?	// Take advantage of the nested typedefs 	// Note that this is a good illustration of why friendship is the strongest relationship classes can have to each other:	// for(vector<int>::size_type i = 0; i < t.v.size(); ++i)		cout << t.v << " ";	cout << endl;	// And this is how I would do it, which makes life a lot easier!	// However, we are still using the int template variable explicitly - friendship, bleh	copy(t.v.begin(), t.v.end(), ostream_iterator<int>(cout, " "));	cout << endl;}int main(){	test<int> t;	show_test(t);	// So sue me, I used system("pause")	system("pause");	return 0;}// The class we could have had!// I am assuming here that the container should have been of T and not int; otherwise why template?template<class T>class test2{	vector<T> v;public:	test2() : v(10,1) {}	void Report()	{		copy(v.begin(), v.end(), ostream_iterator<T>(cout, " "));		cout << endl;	}};