Re: [boost] [Review Request] Multiprecision Arithmetic Library

Subject: Re: [boost] [Review Request] Multiprecision Arithmetic Library
From: Christopher Kormanyos (e_float_at_[hidden])
Date: 2012-04-06 07:00:53

<snip>

> mpf_float<0> is the only type we have that has variable precision at 
> runtime, and the std lib routines that call these constants aren't supported 
> in that use case (which should be documented somewhere - I'll check).  And 
> they're not supported largely because of the caching mechanism.  You should 
> get a compiler error if you try and use that type with those templates, but 
> I'll double check that.
> John.

Got it!

> PS Although it's possible to support variable runtime precision, it 
> complicates things enough not to support it unless folks get really worked 
> up about it ;-) 

I categorically reject dynamic digit modification but do use precision control
in limited instances such as Newton iteration. But you're right. It's a can of worms.

Best regards, Chris.