Thread: void* ptr in structure?

is it legal to use a void* in a structure ?
Q. What is a void* ?

A void* is a generic pointer type. It's a pointer but the type pointed to is unknown. You may not dereference a void* but instead must first cast it to another pointer type before you dereference. Also you may not use a void* in any form of pointer arithmeti

so i added it to a typedef

Code:

typedef enum {
 UCHAR=1,UINT,UDOUBLE,USTRING
} UNIKIND;

typedef struct _UNIVARLINK {
 UNIKIND type;
 int arrayc;
 char * name;

 struct _UNIVARLINK *next;

 //void*data;
} UNIVAR;


void createvar(UNIVAR**varstack,char * varname) 
{
  UNIVAR*p;

  //make new var
  if(!(*varstack) || !(p=findvar((*varstack),varname)))
  {
   p = malloc(sizeof(UNIVAR*));
   p->name = malloc(strlen(varname)+1);
   strcpy(p->name,varname);
   p->type = 1;
   p->arrayc = 1;
   //p->data = NULL;
   p->next = (*varstack);
   (*varstack) = p;
   printf("\n\tCREATING VAR \'%s\'",(*varstack)->name);
  } 
  else
   printf("\n\tALREADY VAR \'%s\'",varname);
}

the first time i run createvar everything goes but if i uncomment //p->data = NULL;and //void*data; everything goes wrong
My question : is it illegale to put a void* in a structure

It's ok to use them in structs.

its ok to put any kind of datatype in struct

Its seems your error is in

Code:

// p = malloc(sizeof(UNIVAR*));
// should be
p = malloc(sizeof(UNIVAR));

ill be damned thx m8