Re: [boost] fixed pt binary lib

From: John C. Femiani (john.femiani_at_[hidden])
Date: 2008-07-31 19:15:14

Neal Becker wrote:
> I have the beginning of a fixed-pt binary lib.  Fixed-pt is popular in DSP applications.  It is integer arithmetic, but keeping track of the binary pt.
>
> It is built on top of constrained_value.
>
> It is small, so I include it here:
Thanks,
I am eagerly waiting for somebody to do something like this.
Why did you choose to base it on constrained values?  Couldn't I have 
used a bounded int as a base_type parameter, making your fixed_pt class 
not dependent on constrained_value anymore?

Also, do your implementations for /= and *= actually round? You actually 
seem to be using the round policy for conversions, is that right? Have 
you looked at the numeric/conversion stuff? (I haven't grokked it yet).

>   //self operator %=(base_type x) { val %= x; return *this; } What 
> should this do?
I think perhaps it should behave like fmod (?)
--Johhn