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From: Gene <gene.ressler@gmail.com>
Newsgroups: comp.lang.ada
Subject: Re: Using Ada.Containers.Vector and Limited Private types
Date: Sun, 13 Jul 2008 08:30:23 -0700 (PDT)
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On Jul 12, 12:41=A0am, "Jeffrey R. Carter"
<spam.jrcarter....@spam.acm.org> wrote:
> Gene wrote:
>
> > Right. =A0I initially did it with UBS and changed it. Unbounded_String,
> > at least in the GNAT implementation, is a super heavyweight. =A0In this
> > case, you call Simple_Name to get a string and then convert it to an
> > unbounded string. =A0In Ada 95 you'd have to convert back to a simple
> > String for printing; fortunately that's fixed in 2005. =A0Nonetheless
> > the syntax and the compiled code are both unsatisfying. =A0Barnes seems
> > to agree:
>
> > ... conversion between bounded and unbounded strings and the raw type
> > String is required rather a lot and is both ugly and inefficient.
>
> Premature optimization is the root of all evil.

Well, evil for sure, but _all_ evil is a bit dramatic. ;-)  I agree.
It is nice that 2005 has a Text_IO variant for UBS.  I had not
realized that before this discussion.  Thanks for making me read the
LRM.

In your little program, which
> I am currently working on a large, soft-real-time system which makes exte=
nsive
> use of Unbounded_String and uses GNAT Pro; we have no problem meeting our=
 timing
> requirements.

You might want to be careful about this. I guess it depends how soft
soft is. Internally it looks like GNAT ends up calling gcc malloc/free
for UBS.  Implementations of malloc/free can have wildly varying
performance depending on current heap structure.  Your app may meet
time requirements today on test data and fail tomorrow because the
heap has fragmented in a different way.