Re: Constructors in Ada95

[Simon Wright <simon@pogner.demon.co.uk>]

Andy Askey <ajaskey@mindspring.com> writes:

> I am sure this has been asked/answered several hundred times but
> nothing current appears in DejaNews.

Perhaps because there's a pretty full discussion in the LRM/Rationale!
If you don't have access, try www.adapower.com ..

with Ada.Finalization;
> package pkg is
>   type type1 is tagged private;
  type Type1 is new Ada.Finalization.Controlled with private;
> private
>   type type1 is tagged
>     record
>       i : integer := 0;
>     end record;
  type Type1 is new Ada.Finalization.Controlled with record
    I : Integer := 0;
  end record;
  procedure Initialize (T : in out Type1);
> end pkg;
> 
> package body pkg is
>   ...
  procedure Initialize (T : in out Type1) is
  begin
    ..
  end Initialize;
> begin
>   Proc_To_Call( This_Current_Instance : in Type1'class);
  -- no, leave this out.
> end pkg;

Initialize gets called whenever an object of type Type1 is created.

See also Adjust and Finalize.