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Message-ID: <47F749CB.30806@obry.net>
Date: Sat, 05 Apr 2008 11:43:39 +0200
From: Pascal Obry <pascal@obry.net>
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To: Gautier <gautier@fakeaddress.nil>
Subject: Re: Ada.Strings.Bounded
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Date: 2008-04-05T11:43:38+02:00
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Gautier,

> Do you mean something like that ?

No quite as:

    B1 : BorString (10);
    B2 : BorString (20);

    B1 := B2;
    --  will raises constraint error

With Unbounded_String we are close to something "usable".

    U1 : Unbounded_String;
    U2 : Unbounded_String;

    U1 := U2;

Works fine! But then it becomes a bit messy when converting back and 
forth with the string type.

    U1 := To_Unbounded_String ("whatever");

    Put_Line (To_String (U1));

Not a big deal, but if we can find a nice way to tell that such routine 
must be used for conversion between type it will be quite handy.

    type Unbounded_String is ...;

    function To_String (U : Unbounded_String) return String;

    for Unbounded_String'Conversion (String) use To_String;

Just to get the idea, then one could write:

    Put_Line (U1);

Of course this raises some questions:

    What to do if we have Put_Line defined for String and
    Unbounded_String? Which version gets called?

...

Anyway that's just some wild thoughts :)

Pascal.

-- 

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--| Pascal Obry                           Team-Ada Member
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