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From: eachus@spectre.mitre.org (Robert I. Eachus)
Subject: Re: Unconstrained array aggregation..sq. peg into round hole?
Date: 1996/03/20
Message-ID: <EACHUS.96Mar19201632@spectre.mitre.org>#1/1
X-Deja-AN: 143213703
references: <4ihrvo$hs5@dfw.dfw.net>
organization: The Mitre Corp., Bedford, MA.
newsgroups: comp.lang.ada
Date: 1996-03-20T00:00:00+00:00
List-Id: <comp.lang.ada>


In article <4ihrvo$hs5@dfw.dfw.net> dweller@dfw.net (David Weller) writes:

  > I must confess I don't use such strange constnat initializations
  > typically, so I'm a little rusty on figuring out a solution.

  > Suggestions are welcome...

   It isn't a GNAT bug, and it is an Ada rule, but one of the weirder
gotchas.  (An element of a one dimensional array is a name not a
slice, so this case only comes up when you have two dimensional to one
dimensional and forget to sprinkle the right syntactic sugar...

 > package Strange is

 >     type Real_Array is array (Natural range <>) of Float;

 >     type Real_Table is array (Natural range <>, Natural range <>) of Float;

--  try: type Real_Table is array (Natural range <>) of Real_Array;

 >     MAX : constant := 3;

 >     Table          : constant Real_Table :=
 >    ( (20.0,  40.0,  80.0),
 >      (20.0,  40.0,  80.0),
 >      (20.0,  40.0,  80.0),
 >      (20.0,  40.0,  80.0),
 >      (60.0, 120.0, 240.0) );

-- the constant is fine... ;-)

 >    An_Array : constant Real_Array;

 >  private

 >    An_Array : constant Real_Array := (0..Max-1 => Table(Max)(0..Max-1));
-- An_Array : constant Real_Array := Table(Max);

 >  end Strange;

  In Ada there is a difference between Table(2)(3) and Table(2,3), in
C there isn't.

--

					Robert I. Eachus

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