可以簡記為pointer to implement：”指向實現的指針”。

[DP]書上定義：將抽象部分與它的實現部分分離，使它們都可以獨立地變化。考慮裝操作系統，有多種配置的計算機，同樣也有多款操作系統。如何運用橋接模式呢？可以將操作系統和計算機分別抽象出來，讓它們各自發展，減少它們的耦合度。當然了，兩者之間有標準的接口。這樣設計，不論是對於計算機，還是操作系統都是非常有利的。下面給出這種設計的UML圖，其實就是橋接模式的UML圖。

#include <bits/stdc++.h>
using namespace std;

#define debug(x) cout << #x << " at line " << __LINE__ << " is: " << x << endl

class
 
 COS
{
public:
    COS() {cout << "OS()" << endl;}
    virtual ~COS() {cout << "~OS()" << endl;}
    virtual void Run(){}
};

class CLinuxOS : public COS
{
public:
    CLinuxOS() {cout << "CLinuxOS()" << endl;}
    ~CLinuxOS() {cout << "~CLinuxOS()" << endl;}
    
 
void Run(){cout << "LinuxOS run()" << endl;}
};

class CUnixOS : public COS
{
public:
    CUnixOS() {cout << "CUnixOS()" << endl;}
    ~CUnixOS() {cout << "~CUnixOS()" << endl;}
    void Run(){cout << "CUnixOS run()" << endl;}
};

class CComputer
{
public
 
:
    CComputer() {cout << "CComputer()" << endl;}
    virtual ~CComputer() {cout << "~CComputer()" << endl;}
    virtual void InstallOS(COS *os){}
};

class CIBMComputer : public CComputer
{
public:
    CIBMComputer() {cout << "CIBMComputer()" << endl;}
    ~CIBMComputer() {cout << "~CIBMComputer()" << endl;}
    void InstallOS(COS *os){ os->Run();}
};

class CHPComputer : public CComputer
{
public:
    CHPComputer() {cout << "CHPComputer()" << endl;}
    ~CHPComputer() {cout << "~CHPComputer()" << endl;}
    void InstallOS(COS *os){ os->Run();}
};

int main(int argc, char *argv[])
{
    COS *os = new CLinuxOS();
    CComputer *cmptr = new CIBMComputer();
    cmptr->InstallOS(os);
    delete cmptr;
    cmptr = NULL;
    delete os;
    os = NULL;
    return 0;
}

第二個示例：

#ifndef SOLUTION_H
#define SOLUTION_H

struct CImplement;
class CAbstractSample
{
public:
    CAbstractSample();
    virtual ~CAbstractSample();
    void abstractDo();
private:
    CImplement *m_impl;
};

#endif // SOLUTION_H

#include "solution.h"
#include <iostream>
using namespace std;
struct CImplement{
    void doSomething(){
        cout << "CImplement doSomething()" << endl;
    }
};

CAbstractSample::CAbstractSample():m_impl(new CImplement)
{
    cout << "CAbstractSample()" << endl;
}

CAbstractSample::~CAbstractSample()
{
    if(m_impl != NULL)
    {
        delete m_impl;
        m_impl = NULL;
    }
    cout << "~CAbstractSample()" << endl;
}

void CAbstractSample::abstractDo(){
    m_impl->doSomething();
}

#include "solution.h"
#include <iostream>
using namespace std;
struct CImplement{
    void doSomething(){
        cout << "CImplement doSomething()" << endl;
    }
};

CAbstractSample::CAbstractSample():m_impl(new CImplement)
{
    cout << "CAbstractSample()" << endl;
}

CAbstractSample::~CAbstractSample()
{
    if(m_impl != NULL)
    {
        delete m_impl;
        m_impl = NULL;
    }
    cout << "~CAbstractSample()" << endl;
}

void CAbstractSample::abstractDo(){
    m_impl->doSomething();
}

int main(int argc, char *argv[])
{
    CAbstractSample *as = new CAbstractSample();
    as->abstractDo();
    delete as;
    as = NULL;
    return 0;
}

$ g++ -g -Wall -std=c++0x solution.cpp main.cpp -o xmain

c++橋接模式