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From: amado.alves@gmail.com
Newsgroups: comp.lang.ada
Subject: Cannot implement with an instantiation?!
Date: Thu, 25 Oct 2007 17:34:06 -0000
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Date: 2007-10-25T17:34:06+00:00
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Ada is being very bad to me. She does not let me instantiate a generic
procedure Generic_Connect nested in a generic package body
Generic_Graphs. Is she in any reason? And how do I make things right?
Thanks a lot.

generic
   ...
package Generic_Graphs is
   ...
   procedure Connect
     (Digraph : in out Digraph_Type;
      From, To : Node_Array);
   ...
end;


package body Generic_Graphs is
   ...

   generic
      ...
   procedure Generic_Connect
     (Digraph : in out Digraph_Type;
      From, To : Node_Array);

   procedure Generic_Connect
     (Digraph : in out Digraph_Type;
      From, To : Node_Array) is
   begin
      ...
   end;

   procedure Connect
     (Digraph : in out Digraph_Type; -- <== GNAT complains here saying
that a
      From, To : Node_Array)         -- formal part is not allowed in
an instantiation
   is new Generic_Connect (True);

   ...
end;


That's ok.

But if the offending part is removed then GNAT says that it conflicts
with the declaration in the package spec.

This is silly. I cannot implement an exported entity with a private
instantiation?!

And then if I move the generic procedure declaration and the
instantiation to the spec then it complains that the instantiation
must be done after the body is visible!

Help!!!