C++ 中const修饰虚函数实例详解分享

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C++ 中const修饰虚函数实例详解

【1】程序1

  #include <iostream>  using namespace std;    class Base  {  public:   virtual void print() const = 0;  };    class Test : public Base  {  public:   void print();  };    void Test::print()  {   cout << "Test::print()" << endl;  }    void main()  {   // Base* pChild = new Test(); //compile error!   // pChild->print();  }

【2】程序2

  #include <iostream>  using namespace std;    class Base  {  public:   virtual void print() const = 0;  };    class Test : public Base  {  public:   void print();   void print() const;  };    void Test::print()  {   cout << "Test::print()" << endl;  }    void Test::print() const  {   cout << "Test::print() const" << endl;  }    void main()  {   Base* pChild = new Test();   pChild->print();  }  /*  Test::print() const  */

【3】程序3

  #include <iostream>  using namespace std;    class Base  {  public:   virtual void print() const = 0;  };    class Test : public Base  {  public:   void print();   void print() const;  };    void Test::print()  {   cout << "Test::print()" << endl;  }    void Test::print() const  {   cout << "Test::print() const" << endl;  }    void main()  {   Base* pChild = new Test();   pChild->print();     const Test obj;   obj.print();     Test obj1;   obj1.print();     Test* pOwn = new Test();   pOwn->print();  }    /*  Test::print() const  Test::print() const  Test::print()  Test::print()  */

备注：一切皆在代码中。

总结：const修饰成员函数，也属于函数重载的一种范畴。

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