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() constTest::print() constTest::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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