设计模式06——桥接模式

 

用例：

//bridge.cpp
//桥接模式：将抽象部分与它的实现部分分离，使它们都可以独立地变化

#include "gtest/gtest.h"

class Implementor
{
public:
    Implementor() {}
    virtual ~Implementor() {}
    virtual int Operation() = 0;
};

class ConcreteImplementor1 : public Implementor
{
public:
    ConcreteImplementor1() {}
    virtual ~ConcreteImplementor1() {}
    virtual int Operation()
    {
        return 1;
    }
};

class ConcreteImplementor2 : public Implementor
{
public:
    ConcreteImplementor2() {}
    virtual ~ConcreteImplementor2() {}
    virtual int Operation()
    {
        return 2;
    }
};


class Abstraction
{
public:
    Abstraction() {}
    virtual ~Abstraction() {}
    virtual int Operation() = 0;
    void SetImplementor(Implementor* imp)
    {
        this->imp = imp;
    }

protected:
    Implementor* imp;
};

class RefinedAbstraction : public Abstraction
{
public:
    RefinedAbstraction() {}
    virtual ~RefinedAbstraction() {}

    int Operation()
    {
        return imp->Operation();
    }
};



TEST(Bridge,bridge)
{
    Abstraction* ab = new RefinedAbstraction();

    Implementor* imp1 = new ConcreteImplementor1();
    ab->SetImplementor(imp1);
    EXPECT_EQ(1,ab->Operation());
    delete imp1;


    Implementor* imp2 = new ConcreteImplementor2();
    ab->SetImplementor(imp2);
    EXPECT_EQ(2,ab->Operation());
    delete imp2;

    delete ab;

}