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Re: freeing NULL pointer
On 10/04/2010 12:52 a.m., John (Eljay) Love-Jensen wrote:
Hi Cedric,
Doesn't C99 (7.20.3.2) says passing NULL to free() just does nothing?
Could be.
I'm behind the times with C99. I last used C in 1989.
I am not sure if the Standard C Library calls from C++ will comply with C99.
The C89 draft says:
"4.10.3.2 The free function
Synopsis
#include <stdlib.h>
void free(void *ptr);
Description
The free function causes the space pointed to by ptr to be
deallocated, that is, made available for further allocation. If ptr
is a null pointer, no action occurs. Otherwise, if the argument does
not match a pointer earlier returned by the calloc , malloc , or
realloc function, or if the space has been deallocated by a call to
free or realloc , the behavior is undefined."
Cheers,
Nicholas Sherlock