Re: tableau à 2 dimensions

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Article #62

#62

From: Ludovic Brenta
Date: Thu, 10 Jan 2013 21:56

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letocha writes:
>> Bien: cela permet d'utiliser des Vector avec la même syntaxe que les arrays. 
>
> Par contre, je ne comprends pas ce point.

Les explications ici:

http://www.adacore.com/adaanswers/gems/gem-123-implicit-dereferencing-in-ada-2012/

et les détails ici:

http://www.ada-auth.org/standards/12rm/html/RM-A-18-2.html

clauses 147.5/3 et suivantes.

En supposant ceci:

   package Vectors is new
     Ada.Containers.Vectors (Index_Type => Positive,
                             Element_Type => Integer);
   V : Vectors.Vector;
begin
   V.Append (12); -- ou bien: Vectors.Append (V, 12);

en Ada 2005 il fallait écrire:

   Ada.Integer_Text_IO.Put (V.Element (1)); -- ou bien: Vectors.Element (V, 1)
   V.Replace_Element (1, 42); -- ou bien: Vectors.Replace_Element (V, 1, 42)

mais Ada 2012 permet d'écrire:

   Ada.Integer_Text_IO.Put (V (1));
   V (1) := 42;

donc, comme pour un tableau à une dimension.  Pour des vectors de
vectors de vectors, la syntaxe serait:

   V (1) (2) (3) := 42;

et non pas

   T (1, 2, 3) := 42;

pour un tableau.

-- 
Ludovic Brenta.

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From: Ludovic Brenta <ludovic@ludovic-brenta.org>
Newsgroups: fr.comp.lang.ada
Subject: Re: tableau à 2 dimensions
Date: Thu, 10 Jan 2013 22:56:49 +0100
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