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Date: Wed, 30 Dec 2015 06:49:10 -0800 (PST)
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Subject: Overriding puzzle
From: gautier_niouzes@hotmail.com
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Xref: news.eternal-september.org comp.lang.ada:28933
Date: 2015-12-30T06:49:10-08:00
List-Id: <comp.lang.ada>

Hello,
A small puzzle for year end...
I have a type A and a derived type Custom. How should I redesign things such that a call to New_Page (for an object of type Custom) displays "This is a custom header" and not "This is a normal header", in the code below ? 
TIA for your help!...
_________________________ 
Gautier's Ada programming 
http://sf.net/users/gdemont/

--8<---------8<---------8<---------8<-------

with Ada.Text_IO; use Ada.Text_IO;

procedure Test_override is

  package Pkg is

    type A is tagged null record;
  
    procedure Header(o: A);
    procedure New_Page(o: A);
    
  end;
  
  package body Pkg is
  
    procedure Header(o: A) is
    pragma Unreferenced (o);
    begin
      Put_Line("This is a normal header");
    end;
  
    procedure New_Page(o: A) is
    begin
      Header(o);
    end;
  end;
  
  type Custom is new Pkg.A with null record;

  overriding procedure Header(o: Custom) is
  pragma Unreferenced (o);
  begin
    Put_Line("This is a custom header");
  end;

  obj: Custom;

begin
  obj.New_Page;
end;