Re: RE: newbie can't get exceptions to work!

[Ted Dennison<dennison@telepath.com>]

In article <mailman.986446867.31184.comp.lang.ada@ada.eu.org>, Wilhelm
Spickermann says...
>
>
>On 05-Apr-01 Jeff Shipman wrote:
>> When I try to compile, I get the following errors:
>> 
>> use_gen_stack.adb:214:12: "STACK_ERROR" is not visible
>> use_gen_stack.adb:214:12: multiple use clauses cause hiding
>
>You have created six _different_ exceptions, which are all called
>STACK_ERROR. The compiler cannot possibly know which one You try to
>handle. You could use names like FLOAT_STACK.STACK_ERROR etc.
>
>You will run into the same problems with the other entities of the
>generic package.

This is a very good example of why "newbies" should be discouraged from using
the "use" clause. It just adds a whole extra possible level of confusion and
screw-ups. Some people (myself included) believe that "use" should almost never
be used. But even those who disagree with that view would agree that it has to
be used wisely. A rank novice will not yet have the knowledge required to make
that determination properly. So novices should really just stick with full
named-notation. When they get their feet under them, then they can go and decide
when "use" is appropriate and when it is not.

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