LNK2005 error in visual c++ (already defined in .obj)

[nabh4u]

hi,
i am getting a link error in my program which states that some variable which i declared in my header file is already defined in the object file.

The error is like this:
error LNK2005: "struct list * first" (?first@@3PAUmylist@@A) already defined in list.obj
error LNK2005: "struct list * last" (?first@@3PAUmylist@@A) already defined in list.obj
error LNK2005: "struct list * current" (?first@@3PAUmylist@@A) already defined in list.obj


this is the declaration i am using in myheader file:

#ifndef LIST_H
#define LIST_H
# include<iostream>
# include<list>
# include<vector>
 
struct list
{
    int number;
    list *previous;
    list *next;
};
 
vector <list *> listpointer; // Vector having the pointer to the elements of the list.
 
list *first; //  is the head of the list.
list *last; // store the last position of the list.
list *current; // for maintiaining the current position
 
void add_first();
 
#endif

what is wrong with the declaration? how can i correct it? I have to use these variables in my cpp file.

[willakawill]

Hi. Perhaps if you remove the #include <list>