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From: Matthew Heaney <mheaney@on2.com>
Newsgroups: comp.lang.ada
Subject: Re: OO Style with Ada Containers
Date: Tue, 20 Nov 2007 09:17:52 -0800 (PST)
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Date: 2007-11-20T09:17:52-08:00
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On Nov 20, 12:00 pm, Matthew Heaney <mhea...@on2.com> wrote:
>
> > Sorting only the first N elements?
> > (let's assume there are at least N)
>
> > sort(v.begin(), v.begin() + N);
>
> > And so on.
>
> procedure Op (V : in out Integer_Vectors.Vector) is
>   I : Extended_Index := V.First + N;
>   C : Cursor := To_Cursor (V, I);
> begin
>   Sort (V.First, C);
> end Op;

That should really be (assuming N has type Count_Type):

procedure Op (V : in out Integer_Vectors.Vector) is
  I : Extended_Index := V.First_Index + Count_Type'Pos (N);
  C : Cursor := To_Cursor (V, I);
begin
  Sort (V.First, C);
end Op;

Alternatively, you could say:

procedure Op (V : in out Integer_Vectors.Vector) is
  I : Extended_Index := V.First_Index + Count_Type'Pos (N);
  function Has_Element (C : Cursor) return Boolean is
  begin
     return To_Index (C) < I;
  end;
  procedure Sort is new Generic_Sort (..., Has_Element);
begin
  Sort (V.First);
end Op;