From: "Jeffrey R. Carter" <spam.jrcarter.not@spam.not.acm.org>
Subject: Re: Fixed-point question
Date: Sat, 27 Jun 2015 12:57:21 -0700
Date: 2015-06-27T12:57:21-07:00 [thread overview]
Message-ID: <mmmv4f$fr8$1@dont-email.me> (raw)
In-Reply-To: <87a8vlrm9j.fsf@theworld.com>
On 06/27/2015 12:20 PM, Bob Duff wrote:
>
> Because of RM-8.6(29). Actually, it's the root_real operator;
> universal_real has no operators. Without the preference rule
> of 8.6(29), it would be ambiguous. As you said, it's calculating
> an exact rational number (at compile time), and converting that.
Root_Real, right. I still tend to think in terms of the rules for Ada 83.
So for C1, the compiler is looking for a visible "/" that yields a result that
can be converted to Fixed_Type. These include those for at least Root_Real,
Float, Duration, and Fixed_Type. 8.6(29) results in Root_Real's "/" being selected.
For C2, the compiler is looking for a visible "/" that yields a result of
Fixed_Type, and only Fixed_Type's "/" does that.
Is that anything close to correct?
--
Jeff Carter
"My brain hurts!"
Monty Python's Flying Circus
21
next prev parent reply other threads:[~2015-06-27 19:57 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-06-26 13:20 Fixed-point question Patrick Noffke
2015-06-26 16:56 ` Jeffrey R. Carter
2015-06-26 18:21 ` Patrick Noffke
2015-06-26 20:21 ` Anh Vo
2015-06-26 20:25 ` Jeffrey R. Carter
2015-06-27 2:55 ` Patrick Noffke
2015-06-26 23:14 ` Qun-Ying
2015-06-27 3:00 ` Patrick Noffke
2015-06-27 4:44 ` Jeffrey R. Carter
2015-06-27 17:59 ` Patrick Noffke
2015-06-27 18:38 ` Jeffrey R. Carter
2015-06-27 19:20 ` Bob Duff
2015-06-27 19:57 ` Jeffrey R. Carter [this message]
2015-06-27 20:42 ` Bob Duff
2015-06-28 11:39 ` Brian Drummond
2015-06-29 13:28 ` Patrick Noffke
2015-06-29 14:13 ` Bob Duff
2015-06-27 23:41 ` Anh Vo
-- strict thread matches above, loose matches on Subject: below --
1995-04-01 0:00 Garlington KE
1995-04-06 0:00 ` Robert Dewar
1995-04-07 0:00 ` Robert I. Eachus
1995-04-07 0:00 ` Robert Dewar
1995-04-07 0:00 ` Garlington KE
1995-04-07 0:00 ` Robert Dewar
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