Re: Clause "with and use"

["Robert I. Eachus" <rieachus@comcast.net>]

Georg Bauhaus wrote:

> I'm wondering whether a "use" deep down might indicate that this
> piece of code doesn't really belong in this unit?
> (I like this feature, but do I like something here that I shouldn't?)

It can, but it doesn't always.  A good example is a group of ADTs that 
have display operations.   The display operations belong in the package 
with the other operations on the same type, but they may be the only 
operation that needs to use Text_IO or some graphics packages.

You can organize things using child packages to segregate the I/O 
operations, but you end up with the display operation being the only one 
to use the child package.

Instead I usually end up with a generic package that handles the display 
operations in a data independent manner, and the individual display 
operations instantiate that package.  Now the use clause is for a local 
generic instance, but it is still there.

-- 
                                           Robert I. Eachus

100% Ada, no bugs--the only way to create software.