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Subject: Re: ANN: Adare_net Ada network lib
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Xref: reader02.eternal-september.org comp.lang.ada:62980
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On Thursday, September 30, 2021 at 6:24:34 AM UTC-6, DrPi wrote:
> Le 27/09/2021 =C3=A0 06:32, Daniel Norte Moraes a =C3=A9crit :=20
> > Em quarta-feira, 22 de setembro de 2021 =C3=A0s 08:07:06 UTC-3, joak...=
=20
> >> onsdag 22 september 2021 kl. 11:16:13 UTC+2 skrev AdaMagica:=20
> >>>> I agree with you Nicolas, they should not be declared Pure. It makes=
 the GNAT compiler check for example that there are no global variables use=
d in the packages but other than that, they (I didn't check all the package=
s) are not Pure. The pragma Pure worked as expected in Ada83 but the meanin=
g and utility of it disappeared with the Ada95 standard.=20
> >>> There is no pragma Pure in Ada 83.=20
> >> Thanks for clearing that up AdaMagica, I wasn't aware.=20
> >>=20
> >> Best regards,=20
> >> Joakim=20
> >=20
> > Really? They _are_ Pure.=20
> > I used linters extensively to result in this. one of these linters made=
 hard use o gnat and gprbuild as his backend.=20
> > Remember this is target Ada 2012 (update 2016) and beyond =3D> there is=
=20
> > no guarantee of operation for Ada versions earlier than Ada2012.
> In a Pure package, shouldn't the subprograms also be Pure ?
Yes...ish.
As mentioned upthread, you can lie about there being no internal state... a=
nd this can still be "interfacially" pure; consider a FIBONACCI function wh=
ich is memoized (Function F(N: Positive) return Positive) -- internally it =
has the memo to look up F(N), which is obviously state, but externally any =
F(X) will return the same value given the same inputs. / Perhaps we should =
allow aspect PURE on subprograms, as well as introduce an aspect STATIC [ha=
ving (user-defined) static-functions would, in particular, allow some nice =
"macro-lite" functionality].