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From: alexander.kleppe@web.de
Newsgroups: comp.lang.ada
Subject: Declaration of private type Containers
Date: Fri, 30 May 2008 04:49:41 -0700 (PDT)
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Date: 2008-05-30T04:49:41-07:00
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Hi all,

I'm relatively new to Ada. I have a problem, which seems pretty basic
to me. Thus, I guess you guys have a easy solution ready.
The only thing I want to do is to  declare a list package, whose
Element_Type is of a private record type:

package A is

type My_Type is private

package My_Type_Lists is new Ada.Containers.Doubly_Linked_List
     (Element_Type	=> My_Type);

private

type My_Type is
record
...
end record;

end A;


GNAT compiler says, this is a "premature use of private type", which I
accept. However, I don't wanna declare the My_Type_Lists package
elsewhere, which would be a possible solution.
Ideally I wanna use it in some other Package or subprogram like this:

package B is

type Rec_Type is private

package My_Type_Lists is new Ada.Containers.Doubly_Linked_List
     (Element_Type	=> A.My_Type);
-- would be possible, but not very nice

private

type Rec_Type is
record
A_List : A.My_Type_Lists.List;
end record;


So what is the correct way to declare the Container package in package
A?

Thanks in advance,
Alex