[fpc-pascal] string concatenation speed
M.Santhoff at t-online.de
Tue Jun 21 20:36:38 CEST 2005
Am Dienstag, den 21.06.2005, 19:21 +0200 schrieb Marco van de Voort:
> > in an application of mine occurs a lot of string separation and
> > re-concatenation. Since it is using masses of ANSI strings this is some
> > performance problem.
> > The strings get stored and loaded from TStringList's and concatenated
> > by simply using '+' and separated with the function copy().
> You could try to avoid repeated setlengths. However this would require
> two passes, something like
> for i:=0 to strlst.count-1 do inc(tot,length(strlst[i]));
> for i:=0 to strlst.count-1 do
> move (targetstring[j],strlst[i]);
So in general reserving buffer space and copying all string in and
finally setting the length would be the way to go here, if I understand
> Posting more code would help too.
See my other mail.
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