A probe into some features of C + +

In the process of learning C + +, also once learned Java, found that Java has a class of nesting, and read C + + books, never a C + + class can be nested, so try to see if C + + can be nested class (compiler environment vc++6.0)

The following code is then available:

1#include <iostream>2 using namespacestd;3 classA4 {5  Public:6 A () {7cout<<"This a"<<Endl;8     }9~a () {cout<<"a dead"<<Endl;}Ten     classB One     { A      Public:     -B () {cout<<"This b"<<Endl;} -~b () {cout<<"B dead"<<Endl;} the     }; - b b; - }; - classC: PublicA + { - }; + intMainintargcChar*argv[]) A { at A; -     return 0; -}

The result is correct, so it appears that C + + is supporting nested classes, at least vc++6.0 is supported

So can class B be used? The following code is then available:

1#include <iostream>2 using namespacestd;3 classA4 {5  Public:6 A () {7cout<<"This a"<<Endl;8     }9     voidGeta () {cout<<"I Am geta ()"<<Endl;}Ten~a () {cout<<"a dead"<<Endl;} One     classB A     { -      Public:     -B () {cout<<"This b"<<Endl;} the~b () {cout<<"B dead"<<Endl;} -         voidGETB () {cout<<"I Am GETB ()"<<Endl;} -          -     }; + b b; - }; + intMainintargcChar*argv[]) A { at A; - A.b.getb (); - a::b B; - B.getb (); -     return 0; -}

The result can be successfully called the GETB () method, which can indirectly prove that the class is correctly recognized, OK, then we see whether B can inherit other classes? The following code is then available:

1#include <iostream>2 using namespacestd;3 classA4 {5  Public:6 A () {7cout<<"This a"<<Endl;8     }9     voidGeta () {cout<<"I Am geta ()"<<Endl;}Ten~a () {cout<<"a dead"<<Endl;} One     classB: PublicA A     { -      Public:     -B () {cout<<"This b"<<Endl;} the~b () {cout<<"B dead"<<Endl;} -         voidGETB () {cout<<"I Am GETB ()"<<Endl;} -          -     }; + b b; - }; +  A intMainintargcChar*argv[]) at { - A; - A.b.getb (); - a::b B; - b.getd (); -     return 0; in}

Well, it turns out that a is undefined, okay, so let's define a class, as follows:

1#include <iostream>2 using namespacestd;3 classD4 {5  Public:6     voidgetd ()7     {8cout<<"I Am getd ()"<<Endl;9     }Ten }; One classA A { -  Public: - A () { thecout<<"This a"<<Endl; -     } -     voidGeta () {cout<<"I Am geta ()"<<Endl;} -~a () {cout<<"a dead"<<Endl;} +     classB: PublicD -     { +      Public:     AB () {cout<<"This b"<<Endl;} at~b () {cout<<"B dead"<<Endl;} -         voidGETB () {cout<<"I Am GETB ()"<<Endl;} -          -     }; - b b; - }; in intMainintargcChar*argv[]) - { to A; + A.b.getb (); - A.geta (); the a.b.getd (); * a::b B; $ B.getb ();Panax Notoginseng b.getd (); -     return 0; the}

The result is also correct, it seems that Class B can inherit other classes, there are also those inheritance relationships.

Conclusion:

We analyze that C + + can be nested in a class, and can manipulate it like a normal class, in addition to the class nested it cannot inherit, there are no other features, it is interesting to verify that the anonymous class can be allowed in C + +.

A probe into some features of C + +