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From: Lucretia <lucretia9@lycos.co.uk>
Newsgroups: comp.lang.ada
Subject: Re: Representation item appears too late
Date: Thu, 25 Oct 2007 06:46:28 -0700
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Date: 2007-10-25T06:46:28-07:00
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On Oct 25, 2:35 pm, Ludovic Brenta <ludo...@ludovic-brenta.org> wrote:
> Consider the following declarations:
>
> package A is
>
>    type Size is (Small, Large);
>
>    type Foo is range 1 .. 8;
>
>    type T is record
>       A : Boolean;
>       B : Boolean;
>       C : Boolean;
>       D : Size_Type;

Should be "Size"

>       E : Foo;
>    end record;
>
>    procedure P (X : in T); -- a null procedure for the sake of example
>
> end A;
>
> with A;
> package B is
>
>    type T is new A.T;

I didn't even know that this was possible!

>    for T use record -- line 5
>       A at 0 range 0 .. 0;
>       B at 0 range 1 .. 1;
>       C at 0 range 2 .. 2;
>       D at 0 range 3 .. 3;
>       E at 0 range 4 .. 7;
>    end record;
>
> end B;
>
> Compiling B with GCC 4.1 I get:
>
> gcc-4.1 -c -g -O2 -gnatafnoy -gnatVa -gnatwa -I- -gnatA /home/lbrenta/src/ada/b.ads
> b.ads:5:04: representation item appears too late
> b.ads:5:04: primitive operations already defined for "T"
> gnatmake: "/home/lbrenta/src/ada/b.ads" compilation error
>
> This also happens with GCC 4.2.
>
> Of course, removing procedure A.P also removes the error but this is
> not an option.
>
> What should I do to specify a representation clause?  Do I have to
> resort to declaring a mirror type in B?  Why?

I've always put the representation clauses with the types they refer
to.

Luke.