[fpc-devel] Re: KOL for freepascal (was: Extend thelibrariespeople!)

Michael Van Canneyt michael at freepascal.org
Tue Jun 7 15:47:35 CEST 2005

On Tue, 7 Jun 2005, Peter Vreman wrote:

>> | > procedure x (const str: string);
>> | > begin
>> | >   filewrite (filedescriptor,pchar(str+#13#10)^,length(str)+2);
>> | > end;
>> |
>> | I do not think this should work. You can't pass the address of a temp
>> | like this.
>> Yes I had to convert some constants to var's (and initialize them) in one
>> procedure..
>> and I noticed Thaddy did this too. I assume delphi is a bit less strict in
>> that it
>> let's you get away with the below... but I'm not sure if it's good to be
>> less strict
>> in this case.. (poor style?) What do you think..
> It is even slow. Splitting it in 2 lines is faster since it removes the
> implicit string concattenation
> filewrite (filedescriptor,pchar(str)^,length(str));
> filewrite (filedescriptor,#13#10,2);

Yes. I would recommend doing it like this; It'll work in Delphi and in
FPC, and is faster in both. For small writes, the difference is not
really harmful, but for a stress-load system (a server log for
example, or a data generator) it's really noticeable. I did some
tests both in Delphi and FPC with this...


More information about the fpc-devel mailing list