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StrategyPattern.cpp
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99 lines (77 loc) · 1.23 KB
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/*
策略模式：定义了算法族，分别封装起来，让它们之间可以互相替换，
此模式让算法的变化独立于使用算法的客户。
*/
#include <iostream>
using namespace std;
class QuackBehavior
{
public:
virtual void Quack() = 0;
};
class FlyBehavior
{
public:
virtual void Fly() = 0;
};
class Duck
{
public:
void Swim()
{
cout << "All duck can swim.\n";
};
virtual void Display() = 0;
void PerformQuack()
{
pQuackBehavior_->Quack();
}
void PerformFly()
{
pFlyBehavior_->Fly();
}
void SetFlyBehavior(FlyBehavior* pFlyBehavior)
{
pFlyBehavior_ = pFlyBehavior;
}
void SetQuackBehavior(QuackBehavior* pQuackBehavior)
{
pQuackBehavior_ = pQuackBehavior;
}
private:
QuackBehavior* pQuackBehavior_;
FlyBehavior* pFlyBehavior_;
};
class SqueakDuck:public Duck
{
void Display()
{
cout << "This is a squeak duck.\n";
}
};
class SqueakSquckBehavior:public QuackBehavior
{
public:
void Quack()
{
cout << "zi zi zi ...\n";
}
};
class SqueakFlyBehavior:public FlyBehavior
{
public:
void Fly()
{
cout << "Can' fly.\n";
}
};
int main()
{
Duck* d = new SqueakDuck;
d->SetFlyBehavior(new SqueakFlyBehavior);
d->PerformFly();
d->SetQuackBehavior(new SqueakSquckBehavior);
d->PerformQuack();
system("pause");
return 0;
}