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From: Martin <martin.dowie@btopenworld.com>
Newsgroups: comp.lang.ada
Subject: Re: Allocation questions
Date: Thu, 28 May 2009 06:39:18 -0700 (PDT)
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On May 28, 1:32=A0pm, Olivier Scalbert <olivier.scalb...@algosyn.com>
wrote:
> Martin wrote:
> > On May 28, 11:05 am, "Dmitry A. Kazakov" <mail...@dmitry-kazakov.de>
>
> > p.s. here's a demo:
>
> > with Ada.Text_IO; use Ada.Text_IO;
> > procedure Demo is
> > =A0 =A0package D is
> > =A0 =A0 =A0 type No_Of_Samples is range 0 .. 1_000;
> > =A0 =A0 =A0 type A_of_F is array (No_Of_Samples range <>) of Float;
> > =A0 =A0 =A0 type R (S : No_Of_Samples :=3D 0) is private;
> > =A0 =A0 =A0 function Create (N : No_Of_Samples) return R;
> > =A0 =A0 =A0 procedure Put_Line (This_R : R);
> > =A0 =A0private
> > =A0 =A0 =A0 type R (S : No_Of_Samples :=3D 0) is
> > =A0 =A0 =A0 =A0 =A0record
> > =A0 =A0 =A0 =A0 =A0 =A0 I : Integer;
> > =A0 =A0 =A0 =A0 =A0 =A0 B : Boolean;
> > =A0 =A0 =A0 =A0 =A0 =A0 A : A_Of_F (1 .. S);
> > =A0 =A0 =A0 =A0 =A0end record;
> > =A0 =A0end D;
> > =A0 =A0package body D is
> > =A0 =A0 =A0 function Create (N : No_Of_Samples) return R is
> > =A0 =A0 =A0 begin
> > =A0 =A0 =A0 =A0 =A0return (S =3D> N,
> > =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0I =3D> 0,
> > =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0B =3D> False,
> > =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0A =3D> (others =3D> 0.0));
> > =A0 =A0 =A0 end Create;
> > =A0 =A0 =A0 procedure Put_Line (This_R : R) is
> > =A0 =A0 =A0 begin
> > =A0 =A0 =A0 =A0 =A0Put_Line (Integer'Image (This_R.I));
> > =A0 =A0 =A0 =A0 =A0Put_Line (Boolean'Image (This_R.B));
> > =A0 =A0 =A0 =A0 =A0Put_Line (No_Of_Samples'Image (This_R.S));
> > =A0 =A0 =A0 =A0 =A0for I in This_R.A'Range loop
> > =A0 =A0 =A0 =A0 =A0 =A0 Put_Line (Float'Image (This_R.A (I)));
> > =A0 =A0 =A0 =A0 =A0end loop;
> > =A0 =A0 =A0 end Put_Line;
> > =A0 =A0end D;
>
> > =A0 =A0R_1 : D.R :=3D D.Create (1);
> > =A0 =A0R_5 : D.R :=3D D.Create (5);
> > begin
> > =A0 =A0D.Put_Line (R_1);
> > =A0 =A0D.Put_Line (R_5);
> > end Demo;
>
> Thanks Martin, it works!
>
> 2 more questions:
>
> 1) In fact (due to my background!), I would like to use the dot notation:
> object.method.
> So I have add "tagged":
>
> =A0 =A0 =A0type Delay_Type (Size : Nb_Of_Samples :=3D 0) is tagged privat=
e;
> =A0 =A0 =A0...
> private
> =A0 =A0 =A0type Delay_Type (Size : Nb_Of_Samples :=3D0) is tagged record
> =A0 =A0 =A0 ...
>
> When I compile, I have:
> "discriminants of tagged type cannot have defaults"
> How can I fix it ?

Just remove the " :=3D 0" bit.

> 2) If Nb_Of_Samples range is too large, around 1..5_000_000, I have a
> nice Segmentation fault. How can I fix that ?

Works fine with 2_000_00 with GNAT GPL 2009 Win32... ;-)

What OS are you using?

Cheers
-- Martin