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From: "markww" <markww@gmail.com>
Newsgroups: comp.lang.ada
Subject: Re: STRING length
Date: 14 Nov 2006 16:44:13 -0800
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Date: 2006-11-14T16:44:13-08:00
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Thanks Georg, that looks to be exactly what I need. I do have a problem
'#including', or, 'withing' rather unbounded string.
Now the head of my source file looks like:

    with Ada.Text_IO, Ada.Integer_Text_IO, Ada.Strings.Unbounded;
    use Ada.Text_IO, Ada.Integer_Text_IO;

which is alright but as soon as I try:

    use Ada.Strings.Unbounded;

the compiler gives me a bunch of errors, it seems to conflict with
Text_IO / Integer_Text_IO? Seems like all my previous calls to Put()
now became invalid. I'm not familiar with Ada but with C++ and
understand namespace collisions, is the same thing going on here?

Thanks


On Nov 14, 5:24 pm, Georg Bauhaus <bauh...@futureapps.de> wrote:
> On Tue, 2006-11-14 at 14:51 -0800, markww wrote:
> > Hi,
>
> > How does one use a variable length string in ada?You use variable length strings in Ada by declaring them
> to be of type UNBOUNDED_STRING which is defined in
> Ada.Strings.Unbounded.
>
> type MY_RECORD is
>   record
>     Name: UNBOUNDED_STRING;
>     Phone: UNBOUNDED_STRING;
>     Address: UNBOUNDED_STRING;
>   end record;
>
> Given that Phone is likely to be limited in length, you
> could consider declaring the Phone component to be of
> type BOUNDED_STRING, which is a string type with a maximum length.
> Unlike STRING, objects of this type can have any number
> of characters up to the maximum. See Ada.Strings.Bounded.
>
> Yet another use of strings is in nested scopes: If you need
> a string in just one place, e.g. temporarily, you can use
> a plain STRING as in
>
>   declare
>     temp: constant STRING := some_string_returning_func(...);
>   begin
>     -- use temp
>   end;
>
> The point here is that the `temp` string variable takes
> its bound from the initialization. You can also make it a
> variable, if you need to write to string components.
>
> Seehttp://en.wikibooks.org/wiki/Ada_Programming/Strings
> 
> -- Georg