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Subject: Re: Reconsidering assignment
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From: Ray Blaak <rAYblaaK@STRIPCAPStelus.net>
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Date: Wed, 06 Jun 2007 22:52:31 GMT
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Date: 2007-06-06T22:52:31+00:00
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Maciej Sobczak <see.my.homepage@gmail.com> writes:
> procedure To_Upper(S : in out String);
> 
> Such a procedure is perfectly reasonable.
> What is not reasonable is this:
> 
> procedure Swap(X, Y : in out String);

I don't see the difference. Consider:

  declare
    s : String := "123";
  begin
    To_Upper(s);
  end;

  procedure To_Upper(S : in out String)
  begin
    s := "12345678";
  end;

> procedure Safe_Swap(X, Y : in out String) with X'Length = Y'Length;

Ugh. This is tedious. Seems easier to me to just let the contraint error happen.

If you really need this, also have a way to just say "with matching
constraints" directly, e.g.

  with X'Subtype = Y'Subtype

That way one does not have to get all explicit for other types that have many
explicit constraints.

-- 
Cheers,                                        The Rhythm is around me,
                                               The Rhythm has control.
Ray Blaak                                      The Rhythm is inside me,
rAYblaaK@STRIPCAPStelus.net                    The Rhythm has my soul.