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From: Anh Vo <anhvofrcaus@gmail.com>
Newsgroups: comp.lang.ada
Subject: Re: Problem where a function is invoked once but called twice (when
 invocation is within an allocator).
Date: Mon, 9 May 2011 17:14:07 -0700 (PDT)
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Date: 2011-05-09T17:14:07-07:00
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On May 9, 4:00=A0pm, Dan <d...@irvine.com> wrote:
> Here's a simpler test case. =A0Taking out the Pragma Pack makes it work.
>
> package Media is
>
> =A0 =A0type Color is
> =A0 =A0 =A0 record
> =A0 =A0 =A0 =A0 =A0val : integer;
> =A0 =A0 =A0 end record;
>
> =A0 =A0type Image is array (integer range <>) of Color;
> =A0 =A0pragma pack (Image); =A0 =A0 =A0 =A0 -- matters!
>
> =A0 =A0function next_Frame return Image;
>
> end Media;
>
> with Ada.Text_IO; use Ada.Text_IO;
> package body Media is
> =A0 =A0counter: integer :=3D 0;
>
> =A0 =A0function next_Frame return Image is
> =A0 =A0begin
> =A0 =A0 =A0 put_line("in next_frame");
> =A0 =A0 =A0 counter :=3D counter + 1;
> =A0 =A0 =A0 return (1..10 =3D> (val =3D> counter));
> =A0 =A0end next_Frame;
>
> end Media;
>
> with Media;
> with text_io;
> procedure Test1 is
>
> =A0 =A0Case_1 : =A0 =A0 =A0 =A0Media.Image :=3D =A0 =A0 Media.Image' (Med=
ia.next_Frame);
> =A0 =A0Case_2 : access Media.Image :=3D new Media.Image' (Media.next_Fram=
e);
> begin
> =A0 =A0text_io.put_line(case_1(5).val'img);
> =A0 =A0text_io.put_line(case_2(5).val'img);
> end;

Thank you for making the simplest test case.

I got double calls, too. It is absolutely a compiler bug.

Anh Vo