CODEWITHSUNDEEP
cpointers
Ankita Balotia
Ankita Balotia

Reputation: 9

I am getting dereferencing to incomplete types every time i run this code

#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>

typedef void withdrawPtr(int);
typedef void depositPtr(int);
typedef void accountPtr(int);
typedef void deltaccountPtr();
int balance;
pthread_mutex_t mutex1;

i have actually converted an equivalent c++ code to c code

typedef struct 
{
   int (*read)();
   withdrawPtr *withdraw;
   depositPtr *deposit;
   accountPtr *account;
   deltaccountPtr *deltaccount;

} accountstrct;


 void  *WithdrawThread(void *param)
{
struct accountstrct*  Mystruct = (struct accountstrct*) param;

here i get dereferencing pointer to incomplete type. I am not getting how else shud icall the function withdraw here.?

Mystruct->withdrawPtr=*withdraw ;
Mystruct->withdrawPtr(2);
return 0;
   }

Upvotes: 0

Views: 139

Answers (2)

codemaker
codemaker

Reputation: 1742

You never defined struct accountstrct. Either define the type as struct accountstrct { }; and reference the type using struct accountstrct or define the type as typedef struct {} accountstrct; and reference the type using accountstrct (not "struct accountscrct").

You currently have defined a type called accountstrct but you are trying to use a type called struct accountstrct.

Upvotes: 3

Kevin
Kevin

Reputation: 56079

I'm not sure how you got those typedefs to compile. Put the * in there and make them proper function pointer definitions. Then take out the * from the struct fields. And on the bottom, Mystruct doesn't have a withdrawPtr field, you probably mean just withdraw. Speaking of which, where is the withdraw it's being set to coming from?

Here's more what it should look like:

#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>

typedef void (*withdrawPtr)(int);
typedef void (*depositPtr)(int);
typedef void (*accountPtr)(int);
typedef void (*deltaccountPtr)();
int balance;
pthread_mutex_t mutex1;

typedef struct 
{
   int (*read)();
   withdrawPtr withdraw;
   depositPtr deposit;
   accountPtr account;
   deltaccountPtr deltaccount;

} accountstrct;


void  *WithdrawThread(void *param)
{
  struct accountstrct*  Mystruct = (struct accountstrct*) param;
...

  Mystruct->withdraw = withdraw;
  Mystruct->withdraw(2);
  return 0;
}

Upvotes: 0

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