Weird type/identifier conflicts
gjacobs at bioinfotools.com
Sat Mar 1 14:21:24 CET 2003
At 10:42 PM +0100 28/2/03, Frank Heckenbach wrote:
>Russell Whitaker wrote:
>> On Fri, 28 Feb 2003, CBFalconer wrote:
>> > Grant Jacobs wrote:
>> > >
>> > .. snip ...
>> > >
>> > > Since these uses statements were within the interface section, I
>> > > presumed the definitions would propagate upwards so that they
>> > > form a hierarchy. Or, put another way, I assumed the interface of
>> > > a unit is extended by any units it uses in its interface section.
>> > That would be very poor practice, since it would expose routines,
>> > types, variables in areas where one wishes to keep them
>> > inaccessible. Uses does not, and should not, mean export.
>> Not quite. given:
>> Unit foo;
>> uses bar;
>> uses nobar;
>> In any user of foo, anything in the interface section of bar should
>> be visable; unit nobar remains hidden.
>Nope. Using `bar' in the interface only means its declarations are
>available when processing the interface declarations of `foo', not
>that they're re-exported.
I'm getting this from a lot of different directions :-)
>As I said, that's quite clear in BP (which is the "standard" as far
>as units are concerned).
>With EP modules, the problem actually
>doesn't arise, since everything exported must be named explicitly,
>but GPC's `all' behaves like BP with units.
Looks I might have to swop from units to modules using export to
achieve the effect I want. After putting units into everything...
Grant Jacobs Ph.D. BioinfoTools
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