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From: Niklas Holsti <niklas.holsti@tidorum.invalid>
Newsgroups: comp.lang.ada
Subject: Re: Seeking for papers about tagged types vs access to subprograms
Date: Sat, 11 May 2013 21:14:40 +0300
Organization: Tidorum Ltd
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Date: 2013-05-11T21:14:40+03:00
List-Id: <comp.lang.ada>

On 13-05-11 10:58 , Yannick Duchêne (Hibou57) wrote:
> Le Sat, 11 May 2013 08:37:15 +0200, Dmitry A. Kazakov
> <mailbox@dmitry-kazakov.de> a écrit:
>> That applies to stateful types only. Not every type is stateful. Bringing
>> state into objects is considered bad practice. So bad, that it motivated
>> some people to invent whole programming paradigms to avoid stateful
>> object,
>> e.g. functional programming. The sole idea of FP is to sweep states under
>> 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
> even 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.

Monads? http://en.wikipedia.org/wiki/Monad_%28functional_programming%29

-- 
Niklas Holsti
Tidorum Ltd
niklas holsti tidorum fi
      .      @       .