Way to test if a pointer has been assigned "new"
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I am writing a function that that is passed a pointer that has been assigned as new (allocated memory), I want to add some error checking to make sure nothing gets pass which has not been allocated, is there a way to for test this? Thanks
new will either throw an exception or return 0 if there is an error during allocation.
Qui fut tout, et qui ne fut rien
Invader''s Realm
Qui fut tout, et qui ne fut rien
Invader''s Realm
If you are on Windows there is a function called:
int _CrtIsValidHeapPointer( const void *userData );
(from the MSDN) which is debug only which will do what you need. MSDN says you need to #include <crtdbg.h> to get it.
int _CrtIsValidHeapPointer( const void *userData );
(from the MSDN) which is debug only which will do what you need. MSDN says you need to #include <crtdbg.h> to get it.
quote:Original post by Invader X
new will either throw an exception or return 0 if there is an error during allocation.
Qui fut tout, et qui ne fut rien
Invader''s Realm
Does new throw an exception? what exception? I thought it just returned zero if something went wrong (out of memory).
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quote:Original post by Drastick
I am writing a function that that is passed a pointer that has been assigned as new (allocated memory), I want to add some error checking to make sure nothing gets pass which has not been allocated, is there a way to for test this? Thanks
WHen declaring the pointer or in the constructor of the class the pointer resides in, set the pointer to NULL or 0 (same thing);
Then allocate the pointer.
if(!Pointer)return; //pointer is zero
or
if(Pointer == NULL) return; //pointer is zero
quote:Original post by quasar3d
Does new throw an exception? what exception?
std::bad_alloc.
quote:
I thought it just returned zero if something went wrong (out of memory).
It does under certain compilers, but it''s non-standard.
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