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May 30, 2016 14:10
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EC++ no.47 my example
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#include <iostream> | |
// 특성정보에 대한 tag들. | |
struct walk_ability_tag {}; | |
struct jump_ability_tag {}; | |
struct fly_ability_tag {}; | |
struct run_ability_tag :public walk_ability_tag {}; | |
struct ground_ability_tag :public run_ability_tag, public jump_ability_tag {}; | |
struct all_ability_tag :public ground_ability_tag, public fly_ability_tag {}; | |
// 특성정보 클래스 템플릿. | |
// 특성정보 클래스는 관례에 따라 항상 구조체로 구현한다. | |
template <class T> | |
struct ability_traits { | |
typedef typename T::ability_category ability_category; | |
}; | |
// 특성정보에 따라 호출될 함수가 컴파일 타임에 결정된다. | |
template <class T> | |
void move(T& obj) { | |
move(obj, typename ability_traits<T>::ability_category()); | |
} | |
// 특성정보에 따른 함수들의 오버로딩. | |
template <class T> | |
void move(T&, walk_ability_tag) { std::cout << "move by walking." << std::endl; } | |
template <class T> | |
void move(T&, jump_ability_tag) { std::cout << "move by jumping." << std::endl; } | |
template <class T> | |
void move(T&, fly_ability_tag) { std::cout << "move by flying." << std::endl; } | |
template <class T> | |
void move(T&, run_ability_tag) { std::cout << "move by running." << std::endl; } | |
template <class T> | |
void move(T&, ground_ability_tag) { std::cout << "move through ground." << std::endl; } | |
template <class T> | |
void move(T&, all_ability_tag) { std::cout << "move by all methods." << std::endl; } | |
// 특성정보를 지원하는 클래스들. | |
class Walker { | |
public: | |
typedef walk_ability_tag ability_category; | |
}; | |
class Jumper { | |
public: | |
typedef jump_ability_tag ability_category; | |
}; | |
class Flyer { | |
public: | |
typedef fly_ability_tag ability_category; | |
}; | |
class Runner { | |
public: | |
typedef run_ability_tag ability_category; | |
}; | |
class GroundMan { | |
public: | |
typedef ground_ability_tag ability_category; | |
}; | |
class Master { | |
public: | |
typedef all_ability_tag ability_category; | |
}; | |
int main() { | |
Walker walker; | |
Jumper jumper; | |
Flyer flyer; | |
Runner runner; | |
GroundMan groundMan; | |
Master master; | |
move(walker); | |
move(jumper); | |
move(flyer); | |
move(runner); | |
move(groundMan); | |
move(master); | |
/* 실행결과 | |
move by walking. | |
move by jumping. | |
move by flying. | |
move by running. | |
move through ground. | |
move by all methods. | |
*/ | |
return 0; | |
} |
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http://blog.naver.com/likeme96/220723621672