On Sun, Feb 25, 2018 at 5:34 PM, Michael Van Canneyt
wrote:
>> 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
On 25/02/18 17:59, Michael Van Canneyt wrote:
On Sun, 25 Feb 2018, Bart wrote:
On Sun, Feb 25, 2018 at 5:34 PM, Michael Van Canneyt
wrote:
So, all we can do is let the compiler pick the float version for
Abs(Variant)?
It seems so. Better yet, don't use variants. They violate what Pascal
sta
On Sun, Feb 25, 2018 at 5:59 PM, Michael Van Canneyt
wrote:
>> So, all we can do is let the compiler pick the float version for
>> Abs(Variant)?
>
>
> It seems so.
OK, for D compatibilty (untill they change that).
> Better yet, don't use variants. They violate what Pascal stands
> for: type saf
On Sun, 25 Feb 2018, Bart wrote:
On Sun, Feb 25, 2018 at 5:34 PM, Michael Van Canneyt
wrote:
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;
Wil
On Sun, Feb 25, 2018 at 5:34 PM, Michael Van Canneyt
wrote:
>> 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
On Sun, 25 Feb 2018, Bart wrote:
On Sun, Feb 25, 2018 at 5:01 PM, Jonas Maebe 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 c
On Sun, Feb 25, 2018 at 5:01 PM, Jonas Maebe 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.fr
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,
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.
Bart
__
On 25/02/18 15:59, Bart wrote:
I don't know how Delphi behaves, but the official Delphi docs state
that Abs() only has overloads for floats, integer and int64.
If their compiler behaves as the docs say, Abs(Variant) would be a syntax error.
No, because variant can be implicitly converted to all
On Sun, Feb 25, 2018 at 3:40 PM, Michael Van Canneyt
wrote:
> Only if we add an
> Abs(Variant) : Variant; which will then make the choice will this work.
If the compiler accepts Abs(Variant), it should IMHO have a correct
overload for this.
(Maybe in the variants unit?)
I don't know how Delph
On Sun, 25 Feb 2018, Bart wrote:
On Sun, Feb 25, 2018 at 1:01 PM, Michael Van Canneyt
wrote:
The compiler does not know at compile time what type the variant is, how can
you expect it to choose the "right" overloaded version ?
I would have expected that it will choose the right one @runti
On Sun, Feb 25, 2018 at 1:01 PM, Michael Van Canneyt
wrote:
> The compiler does not know at compile time what type the variant is, how can
> you expect it to choose the "right" overloaded version ?
I would have expected that it will choose the right one @runtime .
Bart
_
On Sun, 25 Feb 2018, Bart wrote:
Hi,
See: http://forum.lazarus.freepascal.org/index.php/topic,40223.msg277657/
This seems rather unexpected.
Not really.
The abs() function is overloaded for different types.
The compiler does not know at compile time what type the variant is,
how can you
Hi,
See: http://forum.lazarus.freepascal.org/index.php/topic,40223.msg277657/
This seems rather unexpected.
Is it a bug?
program v;
{$ifdef windows}
{$apptype console}
{$endif}
uses
variants;
var
X: Variant;
B: Boolean;
begin
X := -1.5;
writeln('X = ',X);
B := VarIsFloat(X);
wr
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