templete_method 模板方法模式

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#模板方法模式 #c++ #算法

于 2013-12-23 09:00:03 首次发布

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本文介绍了一个使用C++实现的抽象类及其派生类的示例。通过定义一个抽象基类`TestPaper`并声明几个纯虚函数来表示不同的试题答案，再由派生类`TestPaperA`和`TestPaperB`具体实现这些答案。该示例展示了如何通过指向基类的指针调用派生类的方法。

#include <iostream>
#include <string>
using namespace std;

class TestPaper
{
public:
    virtual ~TestPaper(){}
    void TestQuestion1()
    {
        cout<<"TestQuestion1 : A,... B,... C,... D,..."<<endl;
        Answer1();
    }
    virtual void Answer1() =0;
    void TestQuestion2()
    {
        cout<<"TestQuestion2 : A,... B,... C,... D,..."<<endl;
        Answer2();
    }
    virtual void Answer2() =0;
    void TestQuestion3()
    {
        cout<<"TestQuestion3 : A,... B,... C,... D,..."<<endl;
        Answer3();
    }
    virtual void Answer3() =0;
};

class TestPaperA : public TestPaper
{
public:
    void Answer1()
    {
        cout<<"A"<<endl;
    }
    void Answer2()
    {
        cout<<"A"<<endl;
    }
    void Answer3()
    {
        cout<<"A"<<endl;
    }
};

class TestPaperB : public TestPaper
{
public:
    void Answer1()
    {
        cout<<"B"<<endl;
    }
    void Answer2()
    {
        cout<<"B"<<endl;
    }
    void Answer3()
    {
        cout<<"B"<<endl;
    }
};

int main()
{
    TestPaper *pA = new TestPaperA;
    TestPaper *pB = new TestPaperB;
    pA->TestQuestion1();
    pA->TestQuestion2();
    pA->TestQuestion3();
    pB->TestQuestion1();
    pB->TestQuestion2();
    pB->TestQuestion3();
    
    delete pA;
    delete pB;

    return 0;
}