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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Newsgroups: comp.lang.ada
Subject: Re: IBM 437 encoded String to UTF-16 Wide_String
Date: Wed, 28 Nov 2012 15:23:08 +0100
Organization: cbb software GmbH
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Date: 2012-11-28T15:23:08+01:00
List-Id: <comp.lang.ada>

On Wed, 28 Nov 2012 14:47:10 +0100, Georg Bauhaus wrote:

> On 28.11.12 14:36, Dmitry A. Kazakov wrote:
>> The problem is not construction of a container
>> type. It is the relation of the obtained type to the string interface. The
>> string interface is an array of code points. The container must implement
>> this interface in order to be a string. All strings must implement this
>> interface, this is why they are called "strings."
> 
> This says that a string interface consists of operations
> that allow us to use string objects like one uses arrays.

It say that instance implementing the interface are substitutable where a
string is expected. You should be able to pass IBM_437_String to Put_Line,
Trim, To_Lower etc.

> Is this set of array ops not included in a Vector's interface,

By which means the language or the reader knows if it is?

Ada had manifesting type system, so far...

> Which algorithms require a String_Interface that excludes
> other array/vector operations?

?

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de