From: Simon Wright <simon@pushface.org>
Subject: Re: Can't work out how to use with Ada.Numerics.Discrete_Random with SPARK 2014
Date: Fri, 30 Jun 2017 08:28:27 +0100
Date: 2017-06-30T08:28:27+01:00 [thread overview]
Message-ID: <lyvane2auc.fsf@pushface.org> (raw)
In-Reply-To: e3a88437-89a9-4feb-9780-1b06ca32e033@googlegroups.com
digitig <digitig@gmail.com> writes:
> package body Main
> with SPARK_Mode => On
> is
> procedure Test is
> subtype Die is Integer range 1 .. 6;
> subtype Dice is Integer range 2*Die'First .. 2*Die'Last;
> package Random_Die is new Ada.Numerics.Discrete_Random (Die);
(SPARK GPL 2017) move these declarations up to package level .. then,
> use Random_Die;
> G : Generator;
"Generator" is not allowed in SPARK
violation of aspect SPARK_Mode at line xx
> D : Dice;
> begin
> Reset (G); -- Start the generator in a unique state in each run
> loop
> -- Roll a pair of dice; sum and process the results
> D := Random(G) + Random(G);
"Result_Subtype" is not allowed in SPARK
violation of aspect SPARK_Mode at line xx
> Ada.Text_IO.Put_Line(D'Image);
> end loop;
> end Test;
> end Main;
next prev parent reply other threads:[~2017-06-30 7:28 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-06-30 1:15 Can't work out how to use with Ada.Numerics.Discrete_Random with SPARK 2014 digitig
2017-06-30 7:28 ` Simon Wright [this message]
2017-06-30 11:38 ` digitig
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