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From: tmoran@acm.org
Newsgroups: comp.lang.ada
Subject: Re: Assigning the value of a deferred constant?
References: <7a2cqtcole1v0038jiorf4ncdant1fs3im@4ax.com>
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Date: Mon, 17 Sep 2001 17:36:05 GMT
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Date: 2001-09-17T17:36:05+00:00
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>is posible or not in Ada. I seem to remember that Barnes' book
  You can't elaborate the body before you're done elaborating the
spec, but you can elaborate a different package, including its body.
Borrowing from Barnes p. 258 discussion of pragma Elaborate,

  package Early is
    function Is_Big_Endian return Boolean;
  end Early;
  package body Early is
    function Is_Big_Endian return Boolean is ...
  end Early;


  with Early;
  pragma Elaborate(Early);
  package Test is

     type Byte_Order is (Little_Endian, Big_Endian);
     Default_Byte_Order : constant Byte_Order;

  private

     Default_Byte_Order : constant Byte_Order
       := Byte_Order'val(Boolean'pos(Early.Is_Big_Endian));

  end Test;