On 29 May 2009, at 09:44, Flávio Etrusco wrote:
(...)
This is due to the fact that if you pass a variable to an out
parameter and
this variable is reference counted or contains reference counted
elements
(in case of an array/record/object), then the compiler has to insert
finalization code at the caller side for this variable before
passing it in.
The result is that if tmp is reference counted but nevertheless
somehow
contained garbage, e.g. in a program like this:
Is Delphi's behavior the same?
Yes.
Doesn't this have some implications on COM calls? Or is it like this
way exactly to make COM work?
Indeed.
Keep in mind that hints are the lowest level of "programming help"
that the
compiler has to offer, and it is generally impossible to make your
code hint
free. They are only intended to help you if you really are at wits
end
regarding what could be going wrong. Otherwise, it's best to stick to
warnings and notes.
And this make hints so much less useful...
That's the whole point of having a hints category: to put stuff in
that we simply cannot guarantee to be useful (but which might be
useful under some circumstances).
Jonas_______________________________________________
fpc-devel maillist - fpc-devel@lists.freepascal.org
http://lists.freepascal.org/mailman/listinfo/fpc-devel
