objective c - Checking to see if a structure exists? [C] -

background: created hashtable in file called hash_table.c. here part of header file hash_table.h contains:

/* hash_table.h */ #ifndef hash_table_h #define hash_table_h  enum {bucket_count = 1024};  struct node {     char *key;     char *value;     struct node *next; };  struct table {     struct node *array[bucket_count]; };  struct table *tablecreate(void);   //creates table .... 

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ want initiate hashtable in different c file called fdata.c. don't know best way here thinking:

#include "hash_table.h" #include <stdio.h> #include <stdlib.h> #include <string.h>  struct table *t;  //initiate variable  void testfunc() {     if(hashtable not exist) {  //how accomplish this? possible?         t = tablecreate(); //create table     else{         continue...     .... 

obviously, if there better way initiate table ears. (this first time using structures c)

thanks support!

a global pointer initialized nil on app startup. can compare against nil , call tablecreate.

alternatively, can create table @ startup. (e.g. main, or if you're writing objective c, application:didfinishlaunchingwithoptions or along lines.)