[fpc-devel] an observation about GetMem

[Peter Vreman]

> Peter Popov wrote:
>> Well, if it points to something, then there is space, isn't it? Unless
>> it is clearly mentioned in the documentation that GetMem(p,0) results in
>
> You get a pointer to some place where you may store 0 bytes, so nothing :-).
>
> This can be useful because otherwise you may think the allocation failed
> if you get nil back. (And you've disabled heap exception).

In FPC it is done by design. If 0 bytes are asked we allocate at least the minimum alignment to
get a valid pointer. This is done for compatibility with TP7.0 that returns the value of heapptr
which is also a valid pointer.

Peter