On Sun, 25 Feb 2018, Bart wrote:
On Sun, Feb 25, 2018 at 5:01 PM, Jonas Maebe <jo...@freepascal.org> wrote:
As Michael said, overloads are selected at compile time. This is true for
both FPC and Delphi. We even have over a 100 unit tests that we ran under
Delphi to reverse engineer their selection priorities in case of variants:
https://svn.freepascal.org/svn/fpc/trunk/tests/test/cg/variants/
Abs(), however, gets a forced conversion to float in Delphi:
https://bugs.freepascal.org/view.php?id=20551
Hmm, did not find that one (I searched bugtracker before posting here).
Seems you are right:
Delphi Tokyo 10.2
X = -1
VarIsFloat : FALSE
VarIsNumeric: TRUE
VarIsOrdinal: TRUE
After Abs()
X = 1
VarIsFloat : TRUE
VarIsNumeric: TRUE
VarIsOrdinal: FALSE
So, would it be possible to have an overloaded Abs(V: Variant):
Variant; function in the variants unit?
I advise against it.
S : String;
begin
S:='My very nice string';
S:=Abs(S);
end;
Will then compile and give a run-time error, as opposed to a compile-time
error now.
Michael.
_______________________________________________
fpc-devel maillist - fpc-devel@lists.freepascal.org
http://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-devel
