c++ 类名和enum时重复时要在类名前加class::

c++　类名和enum时重复时要在类名前加class::

一些不好的习惯都是用小写，但又没有区分开token，看看代码再说，下面的代码是我在测试polymorphism时写的一部分，怎么也查不出，最后主意到下面红色标志出来的语句，他们（animal）重复了，要区分开来。

重复名的有很多情况，以后遇见再在一起总结，先记录下来。

1. #include <iostream>
2. #include <cstring>
3. #include <string>
4. using namespace std;
5. enum zoo_obj_kind{
6. null = 0,
7. #define zk_null (zoo_obj_kind(null))
8. no = 0,
9. #define zk_no (zoo_obj_kind(no))
10. animal = 1,
11. #define zk_animal (zoo_obj_kind(animal))
12. plant = 2,
13. #define zk_plant (zoo_obj_kind(plant))
14. others = 3,
15. #define zk_others (zoo_obj_kind(others))
16. max = 4
17. #define zk_max 4
18. };
19. static const char * zoo_kind_str [zk_max ] ={
20. "null",
21. "animal",
22. "plant",
23. "others"
24. };
25. class obj{
26. private:
27. char name [40];
28. // void *other_msg;
29. public:
30. obj() {
31. strcpy(name,"null") ;
32. }
33. obj(char *nm){
34. strncpy(name,!nm?"null":nm,sizeof(name));
35. }
36. void say(){
37. cout << "name:" << name << endl;
38. }
39. void say(obj *obj){
40. !obj
41. ? cout << "null\n"
42. : cout << "name:" << obj->name << endl;
43. }
44. };
45. class zoo_obj{
46. private:
47. zoo_obj_kind z_kind;
48. char name [40];
49. void *other_msg;
50. public:
51. zoo_obj() {
52. z_kind = null;
53. strcpy(name,"null") ;
54. }
55. zoo_obj(char *nm, zoo_obj_kind k){
56. strncpy(name,!nm?"null":nm,sizeof(name));
57. z_kind = k;
58. }
59. void say(){
60. cout << "name:" << name << ",kind:"
61. << zoo_kind_str[(int) z_kind] << endl;
62. }
63. void say(zoo_obj *obj){
64. !obj
65. ? cout << "null\n"
66. : cout << "name:" << obj->name << endl;
67. }
68. };
69. class animal:public obj{
70. private:
71. int lags;
72. public:
73. animal(char *nm, int l) :lags(l), obj(nm){ }
74. void say(){
75. obj::say();
76. cout << "lag:" << lags << endl;
77. }
78. };
79. int main(void){
80. zoo_obj obj = zoo_obj( "cat", zoo_obj_kind(animal));
81. obj.say();
82. class::animal dog ("joel's dog",4);
83. dog.say();
84. }