From: "Jean-Pierre Rosen" <rosen.adalog@wanadoo.fr>
Subject: Re: Why both "with" and "use"?
Date: 1999/02/15
Date: 1999-02-15T00:00:00+00:00 [thread overview]
Message-ID: <7a8vv8$gig$1@platane.wanadoo.fr> (raw)
In-Reply-To: 36C5B28C.F32C43A4@jps.net
>Somebody on comp.lang.fortran noticed these two lines in an Ada
snippet
>and questioned why both lines were needed (vs. only USE in Fortran).
>
>>with Ada.Numerics.Elementary_Functions;
>>use Ada.Numerics.Elementary_Functions;
>
>I, with two whole weeks of Ada experience, understand the difference
>(sorta) but don't really understand the rationale. Would anybody
care
>to explain the why of it? Thanks.
>
A short explanation:
A with is at compilation unit. It means: somewhere in unit "Foo",
something from "Bar" will be used.
A use is local. It tells: here is where I really need "Bar".
As an analogy, if you are preparing for a trek, you must take all your
food WITH you. However, you open the cans only when you want to USE
them.
---------------------------------------------------------
J-P. Rosen (Rosen.Adalog@wanadoo.fr)
Visit Adalog's web site at http://perso.wanadoo.fr/adalog
prev parent reply other threads:[~1999-02-15 0:00 UTC|newest]
Thread overview: 55+ messages / expand[flat|nested] mbox.gz Atom feed top
1999-02-13 0:00 Why both "with" and "use"? Mike Silva
1999-02-13 0:00 ` Corey Minyard
1999-02-13 0:00 ` Matthew Heaney
1999-02-13 0:00 ` bill
1999-02-14 0:00 ` dewar
1999-02-14 0:00 ` dewar
1999-02-14 0:00 ` Matthew Heaney
1999-02-13 0:00 ` Tom Moran
1999-02-14 0:00 ` Matthew Heaney
1999-02-16 0:00 ` Samuel Mize
1999-02-17 0:00 ` Jean-Pierre Rosen
1999-02-18 0:00 ` dennison
1999-02-18 0:00 ` robert_dewar
1999-02-19 0:00 ` dennison
1999-02-19 0:00 ` Robert I. Eachus
1999-02-19 0:00 ` robert_dewar
1999-02-23 0:00 ` Robert I. Eachus
1999-02-19 0:00 ` Brian Hanson
1999-02-19 0:00 ` robert_dewar
1999-02-19 0:00 ` bourguet
1999-02-19 0:00 ` robert_dewar
1999-02-19 0:00 ` Matthew Heaney
1999-02-19 0:00 ` dennison
1999-02-19 0:00 ` robert_dewar
1999-02-19 0:00 ` Ada multiple string personalities. why so many? mike
1999-02-19 0:00 ` Tom Moran
1999-02-19 0:00 ` Mike Silva
1999-02-22 0:00 ` Brian Hanson
1999-02-19 0:00 ` robert_dewar
1999-02-19 0:00 ` Why both "with" and "use"? dennison
1999-02-19 0:00 ` robert_dewar
1999-02-18 0:00 ` robert_dewar
1999-02-18 0:00 ` Jean-Pierre Rosen
1999-02-18 0:00 ` robert_dewar
1999-02-19 0:00 ` Jean-Pierre Rosen
1999-02-17 0:00 ` Matthew Heaney
1999-02-17 0:00 ` Jean-Pierre Rosen
1999-02-17 0:00 ` dennison
1999-02-17 0:00 ` Samuel Mize
1999-02-17 0:00 ` Nick Roberts
1999-02-13 0:00 ` mike
1999-02-13 0:00 ` Pat Rogers
1999-02-13 0:00 ` bill
1999-02-13 0:00 ` Pat Rogers
1999-02-13 0:00 ` Matthew Heaney
1999-02-13 0:00 ` bill
1999-02-14 0:00 ` Pat Rogers
1999-02-14 0:00 ` Bob Collins
1999-02-14 0:00 ` Pat Rogers
1999-02-16 0:00 ` Samuel Mize
1999-02-13 0:00 ` Matthew Heaney
1999-02-15 0:00 ` Jean-Pierre Rosen
1999-02-15 0:00 ` Ed Falis
1999-02-16 0:00 ` Jean-Pierre Rosen
1999-02-15 0:00 ` Jean-Pierre Rosen [this message]
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