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From: 402450@cepsz.unizar.es (Jano)
Newsgroups: comp.lang.ada
Subject: Problem with access types using Booch components.
Date: 11 Feb 2003 10:21:53 -0800
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Date: 2003-02-11T18:21:54+00:00
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Hello, I'm trying to use these and I've come across this problem.

Say I have a Collection type completely instantiated:

subtype Collection_x is Abstract_x_collections.Collection;

and I define

type Collection_x_access is access all Collection_x;

Now I have a

C: Collection_x;
C_access: Collection_x_access:= C'access;

All works well until I try to create an iterator:

first try:
it: Iterator:= New_iterator(C_access.all); <-- it raises tag error
inside some booch source.

second try:
it: Iterator:= New_iterator(Collection_x(C_access.all)); <-- same as
above.

third try:
C_bis: Collection_x:= C_access.all;
it: Iterator:= New_iterator(C_bis); <-- It works!!

I would go with the first option.

I'm 99% sure that I'm calling the proper functions in the proper
packages, but if anyone demands it, I can post a more detailed example
with actual code.

What's happening??

(In a side note, in the first of the three calls, if I replace
C_access.all by
 C_access (yes!), Gnat compiles without complaint...)

Regards,

Alex.