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我想用一個靜態成員變量id_index來創建一個「Person」類來跟蹤下一個創建的類的ID(所以沒有兩個類有相同的ID)。當我運行該程序,我得到這些錯誤:創建一個ID靜態成員變量來跟蹤類ID
G:\WorkSpace\Human\Debug/../Person_Class/Person.cpp:11: multiple definition of `Person::id_index'
Person_Class\Person_Set.o:G:\WorkSpace\Human\Debug/../Person_Class/Person_Set.cpp:10: first defined here
Human.o: In function `main':
G:\WorkSpace\Human\Debug/../Human.cpp:16: multiple definition of `Person::id_index'
Person_Class\Person_Set.o:G:\WorkSpace\Human\Debug/../Person_Class/Person_Set.cpp:10: first defined here
這是person.h文件:
#ifndef PERSON_H_
#define PERSON_H_
#include <iostream>
class Person {
public:
static unsigned int id_index; // will aut0-set to 0
Person();
};
unsigned int Person::id_index = 0;
#endif /* PERSON_H_ */
的person.cpp:裏面存放的人類
Person::Person(): ID(id_index) {
}
主要功能。 cpp:
int main(){
Person michael;
return 0;
}