设计模式17：命令者模式【行为型】

#include <iostream>
#include <list>
using namespace std;

//
class CReceiveTV
{
public:
	void OpenTV() { cout<<"open TV."<<endl; }
	void ChangeTV() { cout<<"change TV."<<endl; }
	void CloseTV() { cout<<"close TV."<<endl; }
};

struct ICommand
{
public:
	ICommand(CReceiveTV *pReceiveTV) : m_pReceiveTV(pReceiveTV) { }
	virtual ~ICommand() { }

	virtual void ExcuteCommand() = 0;

protected:
	CReceiveTV *m_pReceiveTV;
};

class COpenCommand : public ICommand
{
public:
	COpenCommand(CReceiveTV *pReceiveTV) : ICommand(pReceiveTV) { }
	virtual ~COpenCommand() { }

	virtual void ExcuteCommand() { m_pReceiveTV->OpenTV(); }
};

class CChangeCommand : public ICommand
{
public:
	CChangeCommand(CReceiveTV *pReceiveTV) : ICommand(pReceiveTV) { }
	virtual ~CChangeCommand() { }

	virtual void ExcuteCommand() { m_pReceiveTV->ChangeTV(); }
};

class CCloseCommand : public ICommand
{
public:
	CCloseCommand(CReceiveTV *pReceiveTV) : ICommand(pReceiveTV) { }
	virtual ~CCloseCommand() { }

	virtual void ExcuteCommand() { m_pReceiveTV->CloseTV(); }
};

class CInvoker 
{
public:
	void Invoke(ICommand *pCommand) { pCommand->ExcuteCommand(); }
};

//
void main()
{
	CReceiveTV receiveTV;
	ICommand *pCommand = new COpenCommand(&receiveTV);

	CInvoker invoker;
	invoker.Invoke(pCommand);

	delete pCommand;
}