Pointer dynamic memory allocation?

Asked Jun 26 '16 at 09:19

Active Jun 26 '16 at 09:22

Viewed 91 times

If we dynamically allocated memory for a pointer in c

ptr=(cast-type*)malloc(byte-size)

and

free(ptr);

when we free that pointer how the free command know about how much byte size is allocated for that pointer in c. Is that data is stored in any of the memory ????

edited Jun 26 '16 at 09:22

asked Jun 26 '16 at 09:19

Joe Vince

2

It will depend on the implementation. – MikeCAT Jun 26 '16 at 09:20
One way or another, the function that allocates the memory (e.g., `malloc`) retains enough information behind the curtain to enable it to free that memory, given just the address it previously returned. – Tom Karzes Jun 26 '16 at 09:22
duplicate of http://stackoverflow.com/questions/1518711/how-does-free-know-how-much-to-free – Pranjal Jun 26 '16 at 09:23
1

"We" do not cast the result of `malloc` in C. – too honest for this site Jun 26 '16 at 09:23

Pointer dynamic memory allocation?

0 Answers0