[fpc-pascal] Pointers in Pascal!!

[Marc Weustink]

Mattias Gaertner wrote:
> On Wed, 30 Apr 2008 01:22:47 +0200
> Marc Weustink <marc at dommelstein.net> wrote:
> 
>> Alan Krause wrote:
>>> Hans Mårtensson wrote:
>>>> But that would not work after the pointer was used and then it's 
>>>> memory freed.
>>>> So a better way might be:
>>>>
>>>> Always when declaring pointers do it this way:
>>>>
>>>> var p:  ^sometype = nil;
>>>>
>>>> Then in stead of using the freemem, define your own procedure:
>>>>
>>>> procedure myfreemem(var p: pointer);
>>>> begin if p<>nil then begin freemem(p); p:=nil end end;
>>> Use FreeAndNil() -
>>>
>>> http://www.delphibasics.co.uk/RTL.asp?Name=FreeAndNil
>> FreeAndNil works only for classes, not for objects/record
> 
> ReAllocMem(p,0);

Ah, now I understand why you use them :)

Anyway does it set p:=nil ?

Marc