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Date: Wed, 8 May 2019 11:37:23 -0700 (PDT)
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Subject: constructor in abstract tagged types
From: Daniel <danielnorberto@gmail.com>
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Xref: reader01.eternal-september.org comp.lang.ada:56260
Date: 2019-05-08T11:37:23-07:00
List-Id: <comp.lang.ada>


Hello, im trying to know how can i use abstract tagged types and constructo=
rs at the same time.

I have this

package FATHERS is
  type Father is abstract tagged record
     Years : Natural;
     field1 : Natural;
--    .....and 15 more fields
  end record;

  function F_build(Years :Natural) return Father is abstract;
  procedure F_forced_to_do_it is abstract;
end FATHERS;

package FATHERS.SONS is
type Son is new father with record
   skate : boolean;
end Son;

function F_Build(Years :Natural) return Son;
procedure F_Forced_to_do_it;
end FATHERS.SONS;

package body FATHERS.SONS is

function F_Build(Years : Natural) return Son is
begin

  =C2=BF?=C2=BF?=C2=BF?=C2=BF?=C2=BF?

end F_Build;

end FATHERS.SONS;


---------------------------------
So the question is How can i make the constructor F_Build of the Son?

Option 1:

  return son'(Years =3D> Years,
              field1 =3D> =C2=BF?,
              field2 =3D> =C2=BF?.
              ...
              field15 =3D> ?=C2=BF

Problem: put 15 fields by hand for every type of son.. really annoying.

Option 2:

  return Son'(Father with
               Skate =3D>True);

Problem: i cannot initialize Father or call any kind of constructor of Fath=
er becouse compiler don't let me make any kind of function of a abstract ta=
gged type.

Regards,
Daniel.