#include <iostream>
#include <cstdlib>
#include <cstring>   //for strcmp
using namespace std;

template <class T>
class greater {
public:
	bool operator()(const T& a, const T& b) const {return a > b;}
};

template <>
class greater<char *> {
public:
	bool operator()(const char *a, const char *b) const {
		return strcmp(a, b) > 0;
	}
};

template <>
class greater<const char *> {
public:
	bool operator()(const char *a, const char *b) const {
		return strcmp(a, b) > 0;
	}
};

int main()
{
	greater<int> g1;
	//cout << g1.operator()(10, 20) << "\n";
	cout << g1(10, 20) << "\n";

	greater<char *> g2;
	//cout << g2.operator()("hello", "goodbye") << "\n";
	cout << g2("hello", "goodbye") << "\n";

	greater<const char *> g3;
	//cout << g3.operator()("hello", "goodbye") << "\n";
	cout << g3("hello", "goodbye") << "\n";

	return EXIT_SUCCESS;
}