[fpc-pascal] Does ReallocMem(p,0) always set p to nil?

Vincent Snijders vsnijders at quicknet.nl
Mon May 7 09:13:59 CEST 2007

Vincent Snijders schreef:
> Hi,
> Consider this piece of code:
> var
>   p: pointer;
> begin
>   p := getmem(100);
>   reallocmem(p,0);
>   p := nil;
> end.
> Do I need to do p:=nil, if I want to be sure that p contains nil?
> I saw that both system.SysReAllocMem and cmem.CReAllocMem do this, is 
> size=0, but the docs at 
> http://lazarus-ccr.sourceforge.net/docs/rtl/system/reallocmem.html don't 
> mention this, so I don't know if I can be trust that is the case for 
> always for all memory managers.

Tough question apparently. Let's try to word it differently.

After reallocmem(p,0) I observed that p is always nil. Is this an implementation 
detail (subject to change) or part of the specification of reallocmem?


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