对象切片与虚函数机制

C++语言: Codee#2574401/

02对象切片

03此处为传值 注意与传地址相比较

04/

05#include

06#include

07usingnamespacestd;

08

09classPet

10{

11stringpname;

12public:

13Pet(conststring&name)

14:pname(name)

15{}

16virtualstringname()const

17{

18returnpname;

19}

20virtualstringdescription()const

21{

22return"This is "+pname;

23}

24};

25

26classDog:publicPet

27{

28stringfavoriteActivity;

29public:

30Dog(conststring&name,conststring&activity)

31:Pet(name),favoriteActivity(activity)

32{}

33stringdescription()const

34{

35returnPet::name()+" likes to "+

36favoriteActivity;

37}

38};

39

40voiddescribe(Petp)

41{

42cout<<p.description()<<endl;

43}

44

45intmain()

46{

47Petp("Alfred");

48Dogd("Fluffy","sleep");

49describe(p);

50describe(d);

51

52return0;

53}

54/

55This is Alfred

56This is Fluffy

57

58Process returned 0 (0x0) execution time : 0.070 s

59Press any key to continue.

60

61/

C++语言: Codee#2574501/

02地址传递

03启用虚函数机制

04/

05#include

06#include

07usingnamespacestd;

08

09classPet

10{

11stringpname;

12public:

13Pet(conststring&name)

14:pname(name)

15{}

16virtualstringname()const

17{

18returnpname;

19}

20virtualstringdescription()const

21{

22return"This is "+pname;

23}

24};

25

26classDog:publicPet

27{

28stringfavoriteActivity;

29public:

30Dog(conststring&name,conststring&activity)

31:Pet(name),favoriteActivity(activity)

32{}

33stringdescription()const

34{

35returnPet::name()+" likes to "+

36favoriteActivity;

37}

38};

39

40voiddescribe(Petp)

41{

42cout<<p->description()<<endl;

43}

44

45intmain()

46{

47Petp=newPet("Alfred");

48Dogd=newDog("Fluffy","sleep");

49describe(p);

50describe(d);

51

52return0;

53}

54/

55This is Alfred

56Fluffy likes to sleep

57

58Process returned 0 (0x0) execution time : 0.059 s

59Press any key to continue.

60

61

62

63*/原文链接: https://www.cnblogs.com/invisible/archive/2012/03/08/2384841.html

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