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From: nospam@thanks.com.au (Don Harrison)
Subject: Re: Can't export object of private type
Date: 1999/03/04
Message-ID: <F826Kw.3C3@syd.csa.com.au>#1/1
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Organization: CSC Australia, Sydney
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Newsgroups: comp.lang.ada
Date: 1999-03-04T00:00:00+00:00
List-Id: <comp.lang.ada>

Nick Roberts wrote:

:Also, you need to remove the function Solo_T from package T (it does nothing 

It exports a reference to the singleton.

: .. and won't compile), 

GNAT didn't have any trouble.

:and move the declaration of Self from the private part
:of package T.Child (where it doesn't need to be, and will cause an
:unnecessary dependency) to the package's body.  

An unnecessary dependency on what?

:The 'access' parameters in
:the subprograms need only be 'in out' parameters; this is (pointedly!) a
:case where access parameters serve no useful purpose..  

The access-parameters serve two useful purposes:

  - An access entity of any access type to T_Type'Class can be used 
    as an actual parameter.
  - That entity can't be corrupted because access-parameters are 
    in-mode.

: (because the objects
:are always going to be declared at library level).

:  type T_Array_Type is array (T_Index_Type) of Access_Class_T_Type;
:
:  T_Array: T_Array_Type := (
:    1 => T.Child.Solo_T.all'Access,          -- 1)
:    2 => T.OTher_Child.Solo_T.all'Access);   -- 1)

This is client - not library - code.


Otherwise: perfect!

Thanks! :)


-- 
Don (Harrison).   donh at syd.csa.com.au