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Date: Wed, 10 Jul 2002 15:45:13 +0200
From: David Rasmussen <pinkfloydhomer@yahoo.com>
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Subject: Re: with and use
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Date: 2002-07-10T15:45:13+02:00
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Jean-Pierre Rosen wrote:
 > "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.
 >

Thanks!

 >
 >> 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.
 >

So with corresponds roughly to an #include of some header file that 
defines prototypes etc. for some other compilation unit in C++, and use 
corresponds roughly to "using namespace Whatever", assuming that the 
things included were in a seperate namespace?

"with" and only appear at the top of a unit. Where can "use" appear?

/David