C++实现工厂模式的例子

最新推荐文章于 2025-05-27 22:08:50 发布

CodeMasterShiller

最新推荐文章于 2025-05-27 22:08:50 发布

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分类专栏： C&amp;C++ 文章标签： c++ class include null

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#include <iostream>
using namespace std;

class Base
{
   public:
       virtual void foo()=0;
};

class DerivedA : public Base
{
   public:
       void foo()
       {
           cout << "foo of DerivedA" << endl;
       }
};

class DerivedB : public Base
{
   public:
       void foo()
       {
           cout << "foo of DerivedB" << endl;
       }
};

enum DerivedType
{
   DTA, DTB,
};

Base* Create(DerivedType type)
{
   switch (type)
   {
       case DTA:
           return new DerivedA();

       case DTB:
           return new DerivedB();

       default:
           break;
   }
   return NULL;
}

template<class T>
Base* CreateByTpl()
{
   return new T();
}

int main()
{
   Base* pa = Create(DTA);
   pa->foo();

   Base* pb = Create(DTB);
   pb->foo();

   pa = CreateByTpl<DerivedA>();
   pa->foo();

   pb = CreateByTpl<DerivedB>();
   pb->foo();
   return 0;
}