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From: =?utf-8?Q?Yannick_Duch=C3=AAne_=28Hibou57?=
 =?utf-8?Q?=29?=
 <yannick_duchene@yahoo.fr>
Newsgroups: comp.lang.ada
Subject: Re: Seeking for papers about tagged types vs access to subprograms
Date: Sat, 11 May 2013 09:58:38 +0200
Organization: Ada @ Home
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Date: 2013-05-11T09:58:38+02:00
List-Id: <comp.lang.ada>

Le Sat, 11 May 2013 08:37:15 +0200, Dmitry A. Kazakov  =

<mailbox@dmitry-kazakov.de> a =C3=A9crit:
> That applies to stateful types only. Not every type is stateful. Bring=
ing
> state into objects is considered bad practice. So bad, that it motivat=
ed
> some people to invent whole programming paradigms to avoid stateful  =

> object,
> e.g. functional programming. The sole idea of FP is to sweep states un=
der
> the carpet.

FP is about expression without side effects (pure expression), not about=
  =

refusing to express states. There is no issue to have expressions  =

representing states and functions returning a state from a state, or eve=
n  =

expressions representing state transition. That's not an FP matter, but =
a  =

domain matter.

I've never seen so far, a paper about avoiding states in FP (what would =
be  =

state in FP anywhere, it not defined by the domain?). Else, out of  =

curiosity, I would welcome a pointer.

-- =

=E2=80=9CSyntactic sugar causes cancer of the semi-colons.=E2=80=9D [1]
=E2=80=9CStructured Programming supports the law of the excluded muddle.=
=E2=80=9D [1]
[1]: Epigrams on Programming =E2=80=94 Alan J. =E2=80=94 P. Yale Univers=
ity