lightoffcommand.hpp

深入浅出设计模式（书配套c++源代码)。包含20个设计模式的c++实现。

#ifndef	_HFDP_CPP_COMMAND_UNDO_LIGHT_OFF_COMMAND_HPP_
#define _HFDP_CPP_COMMAND_UNDO_LIGHT_OFF_COMMAND_HPP_

#include "Undo.hpp"

namespace HeadFirstDesignPatterns {
namespace Command {
namespace Undo {

class LightOffCommand : public Command {

	private: const Light* _light;
 
	public: explicit LightOffCommand( const Light* light ) :
		_light( light ) { 
		assert( light );
	}
	public: void execute() const {
		_light->off();
	}
	public: void undo() const {
		_light->on();
	}
};

} // namespace Undo
} // namespace Command
} // namespace HeadFirstDesignPatterns

#endif