From: "Robert I. Eachus" <eachus@mitre.org>
Subject: Re: Ada vs Delphi?
Date: 1999/08/17
Date: 1999-08-17T22:58:22+00:00 [thread overview]
Message-ID: <37B9E9F2.D97B79B7@mitre.org> (raw)
In-Reply-To: 37b54730.55126310@news.total.net
Andre Ratel wrote:
> But how do you avoid complex expressions becoming cumbersome?
By defining the operators you need so that the code makes sense.
For example:
function Clock return Tick;
type Tick is new Integer; -- lets assume a 1 millisecond clock.
type Seconds is delta 0.001 digits 6; -- let's use a decimal type for
kicks.
type Minutes is range -186400..186399;
...
function "+" (L: Tick; R: Seconds) return Seconds;
function "+" (L: Tick; R: Seconds) return Tick;
pragma Inline("+"); -- applies to both functions.
...
function "+" (L: Tick; R: Seconds) return Seconds is
begin return Seconds(L)/1000 + R; end "+";
function "+" (L: Tick; R: Seconds) return Tick is
begin return L + Tick(R * 1000); end "+";
Now you can write:
Total_Waiting_Time: Seconds := 0.0;
...
function Something;
Now: Tick := Clock;
begin -- waiting ;-)
Acquire_Lock;
Actually_Do_Something;
Release_Lock;
Total_Waiting_Time := Total_Waiting_Time + Clock - Now;
end;
Of course, this is all expository. You don't want to do that, even
when you are writing a simulation package because the language provides
two time packages (Ada.Calendar and Ada.Real_Time) plus a type
Standard.Duration with many types and conversions already defined. (In
addition if you use a predefined time type, you can use it in delay and
delay until statements.)
--
Robert I. Eachus
with Standard_Disclaimer;
use Standard_Disclaimer;
function Message (Text: in Clever_Ideas) return Better_Ideas is...
next prev parent reply other threads:[~1999-08-17 0:00 UTC|newest]
Thread overview: 49+ messages / expand[flat|nested] mbox.gz Atom feed top
1999-08-06 0:00 Ada vs Delphi? Andre Ratel
1999-08-06 0:00 ` Steve Doiel
1999-08-09 0:00 ` Paul Groves
1999-08-08 0:00 ` Steve Doiel
1999-08-10 0:00 ` Ray Blaak
1999-08-10 0:00 ` Steve Doiel
1999-08-14 0:00 ` Andre Ratel
1999-08-09 0:00 ` Gautier
1999-08-11 0:00 ` Andre Ratel
1999-08-12 0:00 ` Gautier
1999-08-14 0:00 ` Andre Ratel
1999-08-14 0:00 ` Gautier
1999-08-16 0:00 ` Gautier
1999-08-15 0:00 ` Steve Doiel
1999-08-17 0:00 ` Robert I. Eachus
1999-08-12 0:00 ` Gautier
1999-08-09 0:00 ` Robert Dewar
1999-08-09 0:00 ` Robert Dewar
1999-08-11 0:00 ` Andre Ratel
1999-08-11 0:00 ` Robert Dewar
1999-08-14 0:00 ` Andre Ratel
1999-08-17 0:00 ` Robert I. Eachus [this message]
1999-08-11 0:00 ` Robert Dewar
1999-08-11 0:00 ` David Botton
1999-08-14 0:00 ` Andre Ratel
1999-08-11 0:00 ` Ted Dennison
1999-08-14 0:00 ` Andre Ratel
1999-08-16 0:00 ` Ted Dennison
1999-08-09 0:00 ` Aidan Skinner
1999-08-10 0:00 ` Brian Rogoff
1999-08-11 0:00 ` Scientific calculations (was Re: Ada vs Delphi? ) Vladimir Olensky
1999-08-11 0:00 ` Robert Dewar
1999-08-11 0:00 ` Robert Dewar
1999-08-11 0:00 ` Vladimir Olensky
1999-08-13 0:00 ` Robert Dewar
1999-08-13 0:00 ` Brian Rogoff
1999-08-15 0:00 ` Vladimir Olensky
1999-08-15 0:00 ` Vladimir Olensky
1999-08-13 0:00 ` Gautier
1999-08-11 0:00 ` Ada vs Delphi? Andre Ratel
1999-08-11 0:00 ` Robert Dewar
1999-08-14 0:00 ` Andre Ratel
1999-08-11 0:00 ` Ada vs Component Pascal (was: Ada vs Delphi?) Ted Dennison
1999-08-06 0:00 ` Ada vs Delphi? William Starner
1999-08-06 0:00 ` William Starner
1999-08-07 0:00 ` tmoran
1999-08-07 0:00 ` Aidan Skinner
1999-08-07 0:00 ` Gautier
1999-08-07 0:00 ` Gautier
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