Re: with and use

["Jean-Pierre Rosen" <rosen@adalog.fr>]

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"David Rasmussen" <pinkfloydhomer@yahoo.com> a �crit dans le message news: 3D2C2FF9.4020300@yahoo.com...
> First of all, what does this message from GNAT mean:
>
> "with" can only appear in context clause
>
A context clause is a clause that appears *before* a compilation unit. A with clause cannot appear *inside* anything else, so this
basically means that you have to move the with clause on top of the unit.

> Secondly, where is with and use typically used, and what is the
> difference between them?
>
A with clause means that a compilation unit needs the services from another *compilation unit* (i.e. a package, subprogram or
generic which is separately compiled).

A use clause factors out a *package*, i.e. you don't have to repeat the package name in front of every element.
Since a package can (but needs not) be a compilation unit, there are cases where both clauses can be applied, but they are really
orthogonals.

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           J-P. Rosen (rosen@adalog.fr)
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