storage size of ‘names’ isn’t known
I get this error while compiling this .c source file
/INIT_SOURCE_BUILD/src/names_list.c:7: error: storage size of ‘names’ isn’t known
#include <stdio.h>
#include "list.h"
int main(){
struct List names;
names->size = 3;
struct ListElmt michael;
struct ListElmt john;
struct ListElmt adams;
names->head = michael;
michael->data = 12;
michael->next = john;
john->data = 14;
john->next = adams;
adams->data = 16;
struct ListElmt pointer = List->head;
for(int x = 0; x < 3 ; x++){
printf("Iteration.%d data: %d", x, pointer->data);
pointer->next = pointer->next->next;
}
}
and here is header of this linked list
#ifndef LIST_H
#define LIST_H
#include <stdio.h>
/* Define linked list elements*/
typedef struct _ListElmt{
void *data;
struct _ListElmt *next;
} ListElmt;
/* Define a structure for the开发者_运维知识库 list*/
typedef struct _List{
int size;
int (*match)(const void *key1, const void *key2);
void (*destroy)(void *data);
ListElmt *head;
ListElmt *tail;
} List;
void list_init(List *list, void (*destroy)(void *data));
void list_destroy(List *list);
int list_ins_next(List *list, ListElmt *element, const void *data);
int list_rem_next(List *list, ListElmt *element, void **data);
int list_size(const List *list);
ListElmt *list_head(const List *list);
ListElmt *list_tail(const List *list);
int list_is_head(const ListElmt *element);
int list_is_tail(const ListElmt *element);
void *list_data(const ListElmt *element);
ListElmt *list_next(const ListElmt *element);
#endif
When you typedef
a struct
like that, you don't have to use struct
when declaring it:
List names;
instead of
struct List names;
It's also not a pointer, so names->size
should be names.size
.
struct List names;
doesn't declare a pointer, but you're trying to dereference it (using ->
). Use names.size
instead.
The struct is called _List. The typedef is List. So you want
List names;
or
struct _List names; /* probably not, the _ is convention for internal names */
Your line is declaring a "struct List" which isn't defined yet.
The other answers are quite correct about the . vs -> issue
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