Head first 设计模式之Strategy C++实现

#ifndef _INCL_DESIGN_PATTERNS_Duck_H
#define _INCL_DESIGN_PATTERNS_Duck_H

#include "Strategy/FlyBehaviour.h"
#include "Strategy/QuackBehaviour.h"

struct Duck
{
    Duck(const FlyBehaviour*, const QuackBehaviour*);
    virtual ~Duck() {}

    void fly() const;
    void quack() const;
    void swim() const;
    void dispaly() const;

    void setFlyBehaviour(const FlyBehaviour*);
    void setQuackBehaviour(const QuackBehaviour*);

private:
    virtual void doDisplay() const = 0;

private:
    const FlyBehaviour* flybehaviour;
    const QuackBehaviour* quackBehaviour;
};

#endif 

#include "Strategy/Duck.h"
#include <iostream>
#include "Strategy/MuteQuack.h"
#include "Strategy/FlyNoWay.h"

Duck::Duck(const FlyBehaviour* flybehaviour, const QuackBehaviour* quackBehaviour) 
    : flybehaviour(flybehaviour)
    , quackBehaviour(quackBehaviour)
{
}

void Duck::fly() const
{
    flybehaviour->fly();
}

void Duck::quack() const
{
    quackBehaviour->quack();
}

void Duck::swim() const
{
    std::cout << "l'm swimming!" << std::endl;
}

void Duck::dispaly() const
{
    doDisplay();
}

void Duck::setFlyBehaviour(const FlyBehaviour* fly)
{
    flybehaviour = fly;
}

void Duck::setQuackBehaviour(const QuackBehaviour* quack)
{
    quackBehaviour = quack;
}

#ifndef _INCL_DESIGN_PATTERNS_RedheadDuck_H
#define _INCL_DESIGN_PATTERNS_RedheadDuck_H
#include "Strategy/Duck.h"
#include <iostream>

struct RedheadDuck : Duck
{
    RedheadDuck(const FlyBehaviour* fly, const QuackBehaviour* quack) : Duck(fly, quack)
    {
    }

private:
    virtual void doDisplay() const
    {
        std::cout << "l'm red head duck" << std::endl;
    }
};

#endif 

#ifndef _INCL_DESIGN_PATTERNS_FlyBehaviour_H
#define _INCL_DESIGN_PATTERNS_FlyBehaviour_H

struct FlyBehaviour
{
    virtual void fly() const = 0;
};

#endif 

#ifndef _INCL_DESIGN_PATTERNS_QuackBehaviour_H
#define _INCL_DESIGN_PATTERNS_QuackBehaviour_H

struct QuackBehaviour
{
    virtual void quack() const = 0;
};

#endif 

#ifndef _INCL_DESIGN_PATTERNS_FlyNoWay_H
#define _INCL_DESIGN_PATTERNS_FlyNoWay_H

#include "Strategy/FlyBehaviour.h"
#include <iostream>

struct FlyNoWay : FlyBehaviour
{
    virtual void fly() const
    {
        std::cout << "l can't flying" << std::endl;
    }
};

#endif 

#ifndef _INCL_DESIGN_PATTERNS_MuteQuack_H
#define _INCL_DESIGN_PATTERNS_MuteQuack_H

#include "Strategy/QuackBehaviour.h"
#include <iostream>

struct MuteQuack : QuackBehaviour
{
    virtual void quack() const
    {
        std::cout << "l'm mute..." << std::endl;
    }
};

#endif 

#ifndef _INCL_DESIGN_PATTERNS_Quack_H
#define _INCL_DESIGN_PATTERNS_Quack_H

#include "Strategy/QuackBehaviour.h"
#include <iostream>

struct Quack : QuackBehaviour
{
    virtual void quack() const
    {
        std::cout << "quack, quack..." << std::endl;
    }
};

#endif 

#ifndef _INCL_DESIGN_PATTERNS_Squeak_H
#define _INCL_DESIGN_PATTERNS_Squeak_H

#include "Strategy/QuackBehaviour.h"
#include <iostream>

struct Squeak : QuackBehaviour
{
    virtual void quack() const
    {   
        std::cout << "squeak, squeak..." << std::endl;
    }
};

#endif