Is there a good lib out there to handle large integer of know size ?

[H. S. Teoh via Digitalmars-d]

On Wed, Jan 06, 2016 at 05:23:12PM -0500, Andrei Alexandrescu via Digitalmars-d wrote:
> On 1/6/16 5:18 PM, deadalnix wrote:
> >On Wednesday, 6 January 2016 at 21:57:13 UTC, Guillaume Piolat wrote:
> >>On Wednesday, 6 January 2016 at 21:25:45 UTC, deadalnix wrote:
> >>>In my case, I'm interested in 160 and 256 bits integers. Using
> >>>BigInt seems wasteful as I know the integer size I want. Do we have
> >>>something like this around ?
> >>
> >>https://github.com/d-gamedev-team/gfm/blob/master/math/gfm/math/wideint.d
> >>
> >>public domain. Slow division. Only power-of-2 bits supported.
> >
> >That is awesome ! Won't do the 160 bits case, but I can deal with
> >that.  Did you consider this as a worthy addition to phobos ? I think
> >it is.
> 
> Yes, we need to add that to phobos. Who could be the champion? --

Here are a few things that should probably be addressed before merging
to Phobos:

- Better error message when user attempts to instantiate a wide int with
  non-power-of-2 bits. (Currently spews a whole bunch of internal
  compile errors.)

- toString() needs to:
  1) Be the non-allocating overload:

  	void toString(scope void delegate(const(char)[]) dg) {...}

  2) Output in decimal by default instead of hex.

- Need a nice way of initializing wide ints from literals.

- [optional] Division performance can probably be improved.


T

-- 
I don't trust computers, I've spent too long programming to think that they can get anything right. -- James Miller