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From: "G.B." <bauhaus@notmyhomepage.invalid>
Newsgroups: comp.lang.ada
Subject: Re: Ok to assume type Duration is for more than one day?
Date: Mon, 23 Jan 2017 09:35:47 +0100
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Date: 2017-01-23T09:35:47+01:00
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On 22.01.17 12:37, reinkor wrote:
> Does this mean that I take a considerable risk if I assume "Duration" can represent more than one day?

Assess the risk using a compile time check. For example,

     Seconds_in_Day : constant := 24*60*60;
     Minimum_Duration : constant := 100.0*Seconds_In_Day;

     procedure Check_Duration_More_Than_One_Day is
     begin
         case Standard.Boolean'(True) is
            when Duration'Last < Minimum_Duration => null;
            when True => null;
         end case;
     end Check_Duration_More_Than_One_Day;

Your implementation of Ada will reject the program at compile time
if
   Duration'Last < Minimum_Duration
is True because choice values must not occur more than once
in a case statement.

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