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free

From cppreference.com
< c‎ | memory
Revision as of 08:19, 15 August 2013 by P12 (Talk | contribs)

Defined in header <stdlib.h>
void free( void* ptr );

Deallocates the space previously allocated by malloc(), calloc() or realloc(). If ptr is null-pointer, the function does nothing.

The behavior is undefined if ptr does not match a pointer returned earlier by malloc(), calloc() or realloc(). Also, the behavior is undefined if the memory area referred to by ptr has already been deallocated, that is, free() or realloc() has already been called with ptr as the argument and no calls to malloc(), calloc() or realloc() resulted in a pointer equal to ptr afterwards.

Contents

Parameters

ptr - pointer to the memory to deallocate

Return value

(none)

Example

#include <stdlib.h>
 
int main(int argc, char* argv[]) 
{
    int* ptr = (int*) malloc(sizeof(int));
    free(ptr);
    return 0;
}


See also