c++桥接模式

1.桥接模式简介

   桥接（Bridge）模式的定义如下：将抽象与实现分离，使它们可以独立变化。它是用组合关系代替继承关系来实现，从而降低了抽象和实现这两个可变维度的耦合度。

2.源码实现

#include <iostream>
#include <string>

using namespace std;

class OS
{
public:
    virtual string GetOS() = 0;
};

class IOS : public OS
{
public:
    virtual string GetOS()
    {
        return "IOS Operator System";
    }
};

class SaiBian : public OS
{
public:
    virtual string GetOS()
    {
        return "SaiBian Operator System";
    }
};

class Phone
{
public:
    virtual void SetOS() = 0;
};

class iPhone : public Phone
{
public:
    iPhone(OS *os)
    {
        m_pOS = os;
    }
    ~iPhone(){};

    virtual void SetOS()
    {
        cout << "Set the OS: " << m_pOS->GetOS().c_str() << endl;
    }

private:
    OS *m_pOS;
};

class Nokia : public Phone
{
public:
    Nokia(OS *os)
    {
        m_pOS = os;
    }
    ~Nokia(){};

    virtual void SetOS()
    {
        cout << "Set the OS: " << m_pOS->GetOS().c_str() << endl;
    }

private:
    OS *m_pOS;
};

int main(int argc, char **argv)
{
    OS *pIOS1 = new IOS();
    Phone *iPhone4 = new iPhone(pIOS1);
    iPhone4->SetOS();

    delete iPhone4;
    delete pIOS1;

    OS *pSaiBian1 = new SaiBian();
    Phone *Nokia1 = new Nokia(pSaiBian1);
    Nokia1->SetOS();

    delete Nokia1;
    delete pSaiBian1;

    return 0;
}

3.编译源码

$ g++ -o example example.cpp

4.运行及其结果

$ ./example
Set the OS: IOS Operator System
Set the OS: SaiBian Operator System