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Date: Tue, 07 Jun 2011 19:33:29 +0200
From: Pascal Obry <pascal@obry.net>
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To: milouz <a.michelizza@gmail.com>
Subject: Re: using `use' : what is the best practice ?
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Date: 2011-06-07T19:33:29+02:00
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Le 07/06/2011 17:32, milouz a �crit :
> But always avoiding 'use' give some rather obfuscated code, especially
> when using some specific arithmetic operator. For example, playing
> with Address arithmetic without 'use' :

I don't like use so when *I* design a package I prefer to take a 
convention where use is not necessary. But when you want to use an 
already built API you must often use it the way it has been designed to 
be used. Take for example Unbounded_String, nobody will avoid using use 
in this case... Look at this code:

    with Ada.Strings.Unbounded;
    procedure Whatever is
       S : Ada.Strings.Unbounded.Unbounded_String;
    begin
       Ada.Strings.Unbounded.Append (S, "toto");
    end Whatever;

Far better with:

    with Ada.Strings.Unbounded;
    procedure Whatever is
       use Ada.Strings.Unbounded;
       S : Unbounded_String;
    begin
       Append (S, "toto");
    end Whatever;

Because Ada.Strings.Unbounded (and all Ada runtime packages) has been 
designed to be used with a use clause.

Now I do prefer:

    package Circle is
       type Object is...

And use it as:

    with Circle;

    O : Circle.Object;

To

    package Circle is
       type Circle_Type is...

And use it as:

    with Circle; use Circle;

    O : Circle_Type;

But all styles are around...

Pascal.

-- 

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