别人的博客再讲策略模式时都会讲三国，策略类就是赵云的锦囊，锦囊里装着若干妙计。在打仗时想要用什么妙计，直接从锦囊里去取。
锦囊类：
class context
{
public:
context(IStrategy *isstrategy);
~context();
void Operate(void);
private:
IStrategy *m_strategy;
};
context::context(IStrategy *isstrategy):m_strategy(isstrategy)
{
}
context::~context()
{
}
void context::Operate(void)
{
m_strategy->Operate();
}
妙计的接口：
class IStrategy
{
public:
IStrategy(void){};
virtual ~IStrategy(void){};
virtual void Operate(void) = 0;
};
走后门妙计：
class BackDoor:public IStrategy
{
public:
BackDoor(void);
~BackDoor(void);
void Operate(void);
};
BackDoor::BackDoor(void)
{
}
BackDoor::~BackDoor(void)
{
}
void BackDoor::Operate(void)
{
std::cout <<"走后门了!" <<std::endl;
}
开绿灯妙计：
class GreenLight:public IStrategy
{
public:
GreenLight(void);
~GreenLight(void);
void Operate(void);
};
GreenLight::GreenLight(void)
{
}
GreenLight::~GreenLight(void)
{
}
void GreenLight::Operate(void)
{
std::cout << "开绿灯了!" << std::endl;
}
主函数：
int main()
{
std::cout << "#1策略"<<std::endl;
context*context1 = new context(new BackDoor());
context1->Operate();
std::cout << "#2策略"<<std::endl;
context*context2 = new context(new GreenLight());
context2->Operate();
getchar();
return 0;
}
运行结果：
#1策略 走后门了! #2策略 开绿灯了!
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