void free ( void * ptr ); |
<cstdlib> |
Deallocate space in memory
A block of memory previously allocated using a call to malloc, calloc or realloc is deallocated, making it availbale again for further allocations.
Parameters
- ptr
- Pointer to a memory block previously allocated with malloc, calloc or realloc to be deallocated.
If a null pointer is passed as argument, no action occurs.
Return Value
(none)
Example
/* free example */
#include <stdio.h>
#include <stdlib.h>
int main ()
{
int * buffer1, * buffer2, * buffer3;
buffer1 = (int*) malloc (100*sizeof(int));
buffer2 = (int*) calloc (100,sizeof(int));
buffer3 = (int*) realloc (buffer2,500*sizeof(int));
free (buffer1);
free (buffer3);
return 0;
}
|
This program has no output. Just demonstrates some ways to allocate and free dynamic memory using the cstdlib functions.
See also
| malloc | Allocate memory block (function) |
| calloc | Allocate space for array in memory (function) |
| realloc | Reallocate memory block (function) |
