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From: =?utf-8?Q?Yannick_Duch=C3=AAne_=28Hibou57?=
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Newsgroups: comp.lang.ada
Subject: Re: Starter project: getopt_long in Ada
Date: Sun, 27 Nov 2011 16:11:54 +0100
Organization: Ada @ Home
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Date: 2011-11-27T16:11:54+01:00
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Le Sun, 27 Nov 2011 13:30:28 +0100, Natasha Kerensikova  =

<lithiumcat@gmail.com> a =C3=A9crit:
> especially access to
> subprograms (which are immune to most of access types problems like
> dangling stuff or leaks).
Yes, indeed (cheese)

> It's just that I don't like at all having a tagged type for only one
> dispatching operation (and no obvious need for internal state).
If you think Specification, you should not say =E2=80=9CI=E2=80=9D here.=


> Of course that's only when considering related operations. In another
> project that I will publish soon (still needs a bit of polishing), I u=
se
> two access-to-subprograms, but they are really meant to be completely
> different sources (one creates tokens from input while the other outpu=
ts
> the token, and the whole point of the separation is to have different
> input-analysis and output-generation that can plugged together). So in=

> that case, I count them as two independant single-operation cases.
Your Markdown processor ?

> My wild guess is that tagged types would need two dereferences while
> access to subprogram only one,
With an access to a subprogram, there is a reference to an address and a=
n  =

address dereference; with a tagged type, there is a reference to an  =

instance and a selector (is that the good word? I'm not sure). I see two=
  =

for both.

> but that might end up being optimized
> into the same thing, and it's probably too little a performance
> difference to matter in most situations.
With batched operations (an iteration like the one your interface provid=
es  =

fall in this case), the difference can become really tiny I believe. You=
  =

can imagine some way for a compiler to optimize it.

> Natasha


-- =

=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 Univer=
sity]