运行代码：

#include"std_lib_facilities.h"

template <class T>struct S 
{
private:
	T val; 

public:
	S<T>() :val(T()) {}

	S<T>(T tt) : val(tt) {};

	T& get();

	void set(T tt) { val = tt; }

	ostream& operator << (ostream& oss);
	
};

template<class T> ostream& operator <<(ostream& oss, vector<T>& vv)
{
	for (int i = 0; i < vv.size(); i++)
		oss << vv[i] << " ";
	return oss;
}

template<class T> ostream& S<T>::operator <<(ostream& oss)
{
	return oss << val;
}

template<class T> T& S<T>::get()
{
	return val;
}

int main()
try
{
	S<int>s_int;

	cout << s_int.get()<<"\n";

	s_int.set(34);

	cout << s_int.get() << "\n";

	S<char>s_char('d');

	cout << s_char.get()<<"\n";

	S<double>s_double(3.3);

	cout << s_double.get()<<"\n";

	S<string>s_string("the_first_time");

	cout << s_string.get()<<"\n";

	vector<int>v_int;

	v_int.push_back(32);

	v_int.push_back(44);

	S<vector<int>>s_vector_int(v_int);

	cout << s_vector_int.get()<<"\n";

	return 0;
}
catch (exception& e) {
	cerr << "error:" << e.what() << '\n';
	keep_window_open();
	return 1;
}
catch (...) {
	cerr << "Oops:unknown exception!\n";
	keep_window_open();
	return 2;
}

运行结果：