C++ 中const修饰虚函数实例详解

　　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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