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Date: Sun, 30 Jun 2013 00:00:18 -0700 (PDT)
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Subject: "shadow" package hierarchy using renaming of child packages
From: Oliver Kellogg <okellogg@users.sourceforge.net>
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Xref: news.eternal-september.org comp.lang.ada:15988
Date: 2013-06-30T00:00:18-07:00
List-Id: <comp.lang.ada>

Hi,

I was quite amazed to find that GNAT lets me rename a child package
of one hierarchy to a child package of a different hierarchy (i.e. having a different root.)

Does this work on other compilers too?

Thanks,

   Oliver


-- file: foo.ads (original root package)
package Foo is
   type T is new Integer;
end Foo;

-- file: foo-child.ads
package Foo.Child is
   function Create return T;
end Foo.Child;

-- file: foo-child.adb
package body Foo.Child is
   function Create return T is
   begin
      return 0;
   end Create;
end Foo.Child;

-- file: shadow.ads (a different root package)
with Foo;
package Shadow is
   subtype T is Foo.T;
   type Other_Stuff is range 999 .. 1000;
end Shadow;

-- file: shadow-child.ads
with Foo.Child;
package Shadow.Child renames Foo.Child;

-- file: test_shadow.adb
with Shadow.Child;
procedure Test_Shadow is
   I : Shadow.T := Shadow.Child.Create;
begin
   null;
end Test_Shadow;