設計模式-模板方法模式

適用情境:基類定義邏輯框架,子類實現具體步驟.

// ctemplatemethod.h
#ifndef CTEMPLATEMETHOD_H
#define CTEMPLATEMETHOD_H

class CTemplateMethod
{
public:
    CTemplateMethod();
    virtual void TemplateProcess();
    virtual void Operation01() = 0;
    virtual void Operation02() = 0;
    virtual void Operation03() = 0;
};

#endif // CTEMPLATEMETHOD_H

// ctemplatemethod.cpp
#include "ctemplatemethod.h"

CTemplateMethod::CTemplateMethod()
{}

void CTemplateMethod::TemplateProcess()
{
    Operation01();
    Operation02();
    Operation03();
}

// concreteprocess.h
#ifndef CONCRETEPROCESS_H
#define CONCRETEPROCESS_H

#include "ctemplatemethod.h"

class ConcreteProcess : public CTemplateMethod
{
public:
    ConcreteProcess();
    virtual void Operation01();
    virtual void Operation02();
    virtual void Operation03();
};

#endif // CONCRETEPROCESS_H

// concreteprocess.cpp
#include "concreteprocess.h"
#include <iostream>

ConcreteProcess::ConcreteProcess()
{}

void ConcreteProcess::Operation01()
{
    std::cout << "operation 01" << std::endl;
}

void ConcreteProcess::Operation02()
{
    std::cout << "operation 02" << std::endl;
}
void ConcreteProcess::Operation03()
{
    std::cout << "operation 03" << std::endl;
}

客戶端:

// main.cpp
#include <iostream>
#include "concreteprocess.h"

using namespace std;

int main(int argc, char *argv[])
{
    CTemplateMethod * process = new ConcreteProcess();
    process->TemplateProcess();
    return 0;
}