From: guerby@gnat.com (Laurent Guerby)
Subject: Re: overload ":=" ???
Date: 1996/07/22
Date: 1996-07-22T00:00:00+00:00 [thread overview]
Message-ID: <ws97mrvsot6.fsf@schonberg.cs.nyu.edu> (raw)
In-Reply-To: 4soh73$56h@newsbf02.news.aol.com
Laurent> This "sort of string" is built in Ada 95 under the name
Laurent> Bounded_String.
David> I looked at that, and it would be great, but... RM A.04.04.106
David> seems to say that this isn't good with dynamic pointers (or am
David> I misreading this?)
First, here is the GNAT implementation of Bounded_String:
private
type Bounded_String is record
Length : Length_Range := 0;
Data : String (1 .. Max_Length);
end record;
So I guess it's very close to what you want, with a big bonus, all
Ada 95 String handling routines are waiting to be used. Note that
you'll need to instanciate a generic to use it.
Second, A.4.4(106) is an "implementation advice" which states:
RM> Implementation Advice
RM>
RM> 106 Bounded string objects should not be implemented by implicit pointers
RM> and dynamic allocation.
As far as I understand it, it advices (not requires) compiler
writers not to use a pointer and "new" to implement this type (this
kind of stuff is for Unbounded_Strings). This is not at all a concern
to the user, who sees only "type Bounded_String is private".
David> what about "write-ability" ????
Please define "write-ability" (I don't want to assume it's related
to the number of characters to type ;-).
David> This signature will self-destruct in 10 seconds...
Boom ;-).
--
Laurent Guerby <guerby@gnat.com>, Team Ada.
"Use the Source, Luke. The Source will be with you, always (GPL)."
next prev parent reply other threads:[~1996-07-22 0:00 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
1996-07-17 0:00 overload ":=" ??? David Morton
1996-07-17 0:00 ` Robert Dewar
1996-07-18 0:00 ` Laurent Guerby
1996-07-18 0:00 ` David Morton
1996-07-19 0:00 ` David Weller
1996-07-19 0:00 ` Brad Balfour
1996-07-25 0:00 ` Wolfgang Gellerich
1996-07-25 0:00 ` Robert A Duff
1996-07-18 0:00 ` John Herro
1996-07-18 0:00 ` Robert Dewar
1996-07-19 0:00 ` John Herro
1996-07-21 0:00 ` David Morton
1996-07-21 0:00 ` Laurent Guerby
1996-07-22 0:00 ` Robert A Duff
1996-07-23 0:00 ` Laurent Guerby
1996-07-23 0:00 ` Robert A Duff
1996-07-23 0:00 ` John Herro
1996-07-22 0:00 ` David Morton
1996-07-22 0:00 ` Robert Dewar
1996-07-23 0:00 ` Robert A Duff
1996-07-22 0:00 ` Robert Dewar
1996-07-22 0:00 ` Laurent Guerby [this message]
1996-07-22 0:00 ` Laurent Guerby
1996-07-23 0:00 ` Tarjei Jensen
1996-07-23 0:00 ` Robert A Duff
1996-07-24 0:00 ` Robert I. Eachus
1996-07-18 0:00 ` Jon S Anthony
1996-07-19 0:00 ` Joerg Ozimek
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