[fpc-devel] Abs(Variant) unexpected result

[Jonas Maebe]

On 25/02/18 16:41, Bart wrote:
> Delphi 10.2 Tokyo:
> 
> X = -1,5
> VarIsFloat : TRUE
> VarIsNumeric: TRUE
> VarIsOrdinal: FALSE
> After Abs()
> X = 1,5
> VarIsFloat : TRUE
> VarIsNumeric: TRUE
> VarIsOrdinal: FALSE
> 
> I asked to test with "X := -1" to see if Delphi always chooses the
> float overload.

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


Jonas