const修饰虚函数
【1】程序1
1 #include <iostream>
2 using namespace std;
3
4 class Base
5 {
6 public:
7 virtual void print() const = 0;
8 };
9
10 class Test : public Base
11 {
12 public:
13 void print();
14 };
15
16 void Test::print()
17 {
18 cout << "Test::print()" << endl;
19 }
20
21 void main()
22 {
23 // Base* pChild = new Test(); //compile error!
24 // pChild->print();
25 }
【2】程序2
1 #include <iostream>
2 using namespace std;
3
4 class Base
5 {
6 public:
7 virtual void print() const = 0;
8 };
9
10 class Test : public Base
11 {
12 public:
13 void print();
14 void print() const;
15 };
16
17 void Test::print()
18 {
19 cout << "Test::print()" << endl;
20 }
21
22 void Test::print() const
23 {
24 cout << "Test::print() const" << endl;
25 }
26
27 void main()
28 {
29 Base* pChild = new Test();
30 pChild->print();
31 }
32 /*
33 Test::print() const
34 */
【3】程序3
1 #include <iostream>
2 using namespace std;
3
4 class Base
5 {
6 public:
7 virtual void print() const = 0;
8 };
9
10 class Test : public Base
11 {
12 public:
13 void print();
14 void print() const;
15 };
16
17 void Test::print()
18 {
19 cout << "Test::print()" << endl;
20 }
21
22 void Test::print() const
23 {
24 cout << "Test::print() const" << endl;
25 }
26
27 void main()
28 {
29 Base* pChild = new Test();
30 pChild->print();
31
32 const Test obj;
33 obj.print();
34
35 Test obj1;
36 obj1.print();
37
38 Test* pOwn = new Test();
39 pOwn->print();
40 }
41
42 /*
43 Test::print() const
44 Test::print() const
45 Test::print()
46 Test::print()
47 */
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。
Good Good Study, Day Day Up.
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