How to store and remove dynamically and automatic variable of generic data type in custum list data
- by Vineel Kumar Reddy
Hi
I have created a List data structure implementation for generic data type with each node declared as following.
struct Node
{
void *data;
....
....
}
So each node in my list will have pointer to the actual data(generic could be anything) item that should be stored in the list.
I have following signature for adding a node to the list
AddNode(struct List *list, void* eledata);
the problem is when i want to remove a node i want to free even the data block pointed by *data pointer inside the node structure that is going to be freed. at first freeing of datablock seems to be straight forward
free(data) // forget about the syntax.....
But if data is pointing to a block created by malloc then the above call is fine....and we can free that block using free function
int *x = (int*) malloc(sizeof(int));
*x = 10;
AddNode(list,(void*)x); // x can be freed as it was created using malloc
what if a node is created as following
int x = 10;
AddNode(list,(void*)&x); // x cannot be freed as it was not created using malloc
Here we cannot call free on variable x!!!!
How do i know or implement the functionality for both dynamically allocated variables and static ones....that are passed to my list....
Thanks in advance...
