/*
 * mammal_traits.h
 *
 *  Created on: May 25, 2009
 *      Author: mac
 */

#ifndef _MAMMAL_TRAITS_H_
#define _MAMMAL_TRAITS_H_

struct __yes_struct {};
struct __no_struct {};

template <class T>
struct teach_traits {
	typedef __no_struct oktoteach;
	typedef __yes_struct oktostudy;

	static bool _canTeach(__no_struct) {
		return false;
	}
	static bool _canTeach(__yes_struct) {
		return true;
	}
	static bool canTeach() {
		return _canTeach(T());
	}
	virtual void teachClass(T);
	void doTeachingDespatch(T v, __no_struct);
	void doTeachingDespatch(T v, __yes_struct);
	virtual void study(T);
	void studyDespatch(T v, __no_struct);
	void studyDespatch(T v, __yes_struct);
};

template <class T>
void teach_traits<T>::teachClass(T v) {
	typedef typename teach_traits<T>::oktoteach ok;
	doTeachingDespatch(v, ok());
}

template <class T>
void teach_traits<T>::doTeachingDespatch(T v, __no_struct) {
	std::cout << "Don't teach" << std::endl;
}

template <class T>
void teach_traits<T>::doTeachingDespatch(T v, __yes_struct) {
	std::cout << "Teaching class" << std::endl;
}

template <class T>
void teach_traits<T>::study(T v) {
	typedef typename teach_traits<T>::oktostudy ok;
	studyDespatch(v, ok());
}

template <class T>
void teach_traits<T>::studyDespatch(T v, __no_struct) {
	std::cout << "Don't study" << std::endl;
}

template <class T>
void teach_traits<T>::studyDespatch(T v, __yes_struct) {
	std::cout << "Read books!" << std::endl;
}


#endif