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From: Vincent Marciante <INALID_EXCEPT_FOR_marciant@earthlink.net>
Newsgroups: comp.lang.ada
Subject: Re: Representation item appears too late
Date: Fri, 26 Oct 2007 00:08:18 -0400
Organization: Posted via Supernews, http://www.supernews.com
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Date: 2007-10-26T00:08:18-04:00
List-Id: <comp.lang.ada>

Ludovic Brenta 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;
>       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;
>    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.

How about:


package A is

   type Size is (Small, Large);

   type Foo is range 1 .. 8;

   package Base is
      type T is record
         A : Boolean;
         B : Boolean;
         C : Boolean;
         D : Size;
         E : Foo;
      end record;
   end Base; 

   type T is new Base.T;

   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.Base.T;
   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;


Vinny


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