设计模式之工厂模式练习

设计模式中最基本的工厂模式

感觉就是根据输入的类型决定选择何种类与进行何种操作。

跟面向过程中输入1则执行func1();输入2则执行func2()基本一致的想法

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#include <iostream>
 
using namespace std;
 
 
enum eShoeType{ leather = 0,rubber};
 
class CShoe{
public:
    virtual void What() = 0;
};
 
class CLeatherShoe : public CShoe
{
public:
    void What() {cout << "I am leather shoe." << endl;}
};
 
class CRubberShoe : public CShoe
{
public:
    void What() {cout << "I am rubber shoe." << endl;}
};
 
class CShoeFactory
{
public:
    CShoe* GetShowInstance(eShoeType type)
    {
        cout << "工厂生产鞋子ing..." << endl;
        switch(type)
        {
        case leather:
            return new CLeatherShoe();
        case rubber:
            return new CRubberShoe();
        default:
            return NULL;
        }
    }
};
 
void TestWithCpp()
{
    CShoeFactory factory;
    CShoe* pShoe = NULL; 
 
 
    pShoe = factory.GetShowInstance(leather);
    if(NULL != pShoe)
    {
        pShoe->What();
        delete pShoe;
        pShoe = NULL;
    }
     
 
    pShoe = factory.GetShowInstance(rubber);
    if(NULL != pShoe)
    {
        pShoe->What();
        delete pShoe;
        pShoe = NULL;
    }
}
////////////////////////////////////////////////////////
typedef struct SHOE{
    int type;
    void (*print_shoe)(struct SHOE*);
}Shoe;
 
void PrintLeatherShoe(Shoe* pShoe)
{
    if(NULL != pShoe)
        printf("I am leather shoe \n");
}
 
void PrintRubberShoe(Shoe* pShoe)
{
    if(NULL != pShoe)
        printf("I am rubber shoe \n");
}
 
 
Shoe* FactoryShoe(int type)
{
    Shoe* pShoe = NULL;
 
    pShoe = (Shoe*)malloc(sizeof(Shoe));
    if(NULL == pShoe)
        return NULL;
     
    memset(pShoe,0,sizeof(Shoe));
 
    if(leather == type)
    {
        pShoe->type = type;
        pShoe->print_shoe = PrintLeatherShoe;
    }else if( rubber == type)
    {
        pShoe->type = type;
        pShoe->print_shoe = PrintRubberShoe;
    }else
    {
        free(pShoe);
        pShoe = NULL;
        return NULL;
    }
    return pShoe;
}
 
 
 
void TestWithC()
{
    printf("\n\n 测试C版本工厂模式\n");
 
 
    Shoe* pShoe = FactoryShoe(leather);
    if(NULL != pShoe)
    {
        pShoe->print_shoe(pShoe);
        free(pShoe);
        pShoe = NULL;
    }
 
    pShoe = FactoryShoe(rubber);
    if(NULL != pShoe)
    {
        pShoe->print_shoe(pShoe);
        free(pShoe);
        pShoe = NULL;
    }
 
    pShoe = FactoryShoe(994);
    if(NULL != pShoe)
    {
        pShoe->print_shoe(pShoe);
        free(pShoe);
        pShoe = NULL;
    }
 
 
}
 
 
////////////////////////////////////////////////////////
int _tmain(int argc, _TCHAR* argv[])
{
    TestWithCpp();
    TestWithC();
    return 0;
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