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From: "Steve" <nospam_steved94@comcast.net>
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 <mailman.203.1103467874.10401.comp.lang.ada@ada-france.org>
 <qBhxd.4359$RH4.2409@newsread1.news.pas.earthlink.net>
Subject: Re: Random Input-Size and recognizing ENTER-press
Date: Mon, 20 Dec 2004 06:36:22 -0800
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Date: 2004-12-20T06:36:22-08:00
List-Id: <comp.lang.ada>

IMHO it's silly to worry about the number of allocations an deallocations 
when you're talking about keeping up with someone typing at a keyboard 
(especially at todays processor speeds).

Steve
(The Duck)

"Jeffrey Carter" <spam@spam.com> wrote in message 
news:qBhxd.4359$RH4.2409@newsread1.news.pas.earthlink.net...
> Marius Amado Alves wrote:
>
>>    function Get_String return String is
>>       U : Unbounded_String;
>>    begin
>>       loop
>>          Get_Immediate (C);
>>          exit when C = CR;
>>          Append (U, C);
>>       end loop;
>>       return To_String (U);
>>    end;
>
> You might want to take a look at the source for Ada.Strings.Unbounded from 
> GNAT before advocating an approach such as this. Every addition of a 
> Character allocates a new String, copies the old String + new Character 
> into the new String, and deallocates the old String. For a string of N 
> Characters, that's N allocations and deallocations. Using Get_Line to 
> obtain the Characters can improve that to N / Buffer'Length + 1.
>
> It's not clear that the OP really requires Get_Immediate; the only 
> requirement stated is the need to read an arbitrary-length String. The 
> discussion of recognizing when the Enter key is pressed is part of a 
> proposed solution, not the problem.
>
> -- 
> Jeff Carter
> "C++: The power, elegance and simplicity of a hand grenade."
> Ole-Hjalmar Kristensen
> 90