Destructors and virtual destructors

1#include <iostream>2 3 4 using namespacestd;5 6 classA7 {8  Public:9A () {cout <<"Construction a!"<<Endl;};Ten     Virtual~a () {cout <<"destructor a!"<<Endl;}; One  A     Virtual voidDoSomething () {cout <<"A's dosomething!"<<Endl;}; - }; -  the classB: PublicA - { -  Public: -B () {cout <<"Construction b!"<<Endl;}; +~b () {cout <<"destructor b!"<<Endl;}; -  +     voidDoSomething () {cout <<"B's dosomething!"<<Endl;}; A }; at  - intMain () - { -A *test1 =NewA; -cout <<"**************"<<Endl; -Test1->dosomething (); incout <<"**************"<<Endl; -     DeleteTest1; tocout <<"**************"<<Endl; +B *test2 =NewB; -cout <<"**************"<<Endl; theTest2->dosomething (); *cout <<"**************"<<Endl; $     DeleteTest2;Panax Notoginsengcout <<"**************"<<Endl; -A *test3 =NewB; thecout <<"**************"<<Endl; +Test3->dosomething (); Acout <<"**************"<<Endl; the     DeleteTest3; +     return 0; -}

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Operation Result:

Modify the code, delete the virtual

1#include <iostream>2 3 4 using namespacestd;5 6 classA7 {8  Public:9A () {cout <<"Construction a!"<<Endl;};Ten~a () {cout <<"destructor a!"<<Endl;}; One  A     Virtual voidDoSomething () {cout <<"A's dosomething!"<<Endl;}; - }; -  the classB: PublicA - { -  Public: -B () {cout <<"Construction b!"<<Endl;}; +~b () {cout <<"destructor b!"<<Endl;}; -  +     voidDoSomething () {cout <<"B's dosomething!"<<Endl;}; A }; at  - intMain () - { -A *test1 =NewA; -cout <<"**************"<<Endl; -Test1->dosomething (); incout <<"**************"<<Endl; -     DeleteTest1; tocout <<"**************"<<Endl; +B *test2 =NewB; -cout <<"**************"<<Endl; theTest2->dosomething (); *cout <<"**************"<<Endl; $     DeleteTest2;Panax Notoginsengcout <<"**************"<<Endl; -A *test3 =NewB; thecout <<"**************"<<Endl; +Test3->dosomething (); Acout <<"**************"<<Endl; the     DeleteTest3; +     return 0; -}

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Operation Result:

If it is

b b;

Results:

Destructors and virtual destructors