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Date: Wed, 03 Sep 2003 00:05:27 +0800
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Subject: Re: float with 24-bit resolution
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Date: 2003-09-03T00:05:27+08:00
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Randy Brukardt wrote:
> "Matthew Heaney" <matthewjheaney@earthlink.net> wrote in message
> news:bj40b.59$yQ3.11@newsread1.news.atl.earthlink.net...
> 
>>"Adrian Hoe" <mailbox@nospam.adrianhoe.com.my> wrote in message
>>news:3f405ef4$1_1@news.tm.net.my...
>>
>>>But subtracting the value of Angle_Delta makes the code more
>>>understandable, doesn't it? That translates to -360.0000000 ..
>>
>>+359.9999571.
>>
>>No, it does not.  The practice of subtracting off T'Small from the upper
>>bound in the type declaration is distracting, and only adds unecesssary
>>noise.  The language is the way it is, so don't fight it.
> 
> 
> Bull. :-)
> 
> The phony declaration of the upper bound is confusing to the reader; users
> should not take advantage of this "convinience". Consider:
> 
>     Limit : constant := 360.0;
>     The_Small : constant := Limit / 2.0**23;
>     type Matts_Type is delta The_Small range -Limit .. Limit;
>     Obj : Matts_Type;
>     if Matts_Type'Last /= Limit then
>         Put_Line ("Yep, the specified limit wasn't used");
>     end if;
>     Obj := Limit; -- Raises Constraint_Error!
> 
> The last is likely to be mysterious during maintenance, even to be
> knowledgable user.
> 
>     type Randys_Type is delta The_Small range -Limit+The_Small ..
> Limit-The_Small;

"-Limit+The_Small .. Limit-The_Small" does not comply to my requirement 
which the angle must be in -360.0000000 to +359.9999571.

> does not suffer from that confusion, and is hardly any harder to read. (Note
> that this "convinence" applies to both bounds of the fixed point type, and
> fixed point types don't get the most negative value that integer types do.)
> 
>                         Randy.
> 
> 
> 
> 
>