add phobos module std.halffloat ?

[tn]

On Wednesday, 19 December 2012 at 10:13:56 UTC, Iain Buclaw wrote:
> On 19 December 2012 08:55, Walter Bright 
> <newshound2 at digitalmars.com> wrote:
>
>> On 12/19/2012 12:47 AM, Alex Rønne Petersen wrote:
>>
>>> On 19-12-2012 08:35, Jacob Carlborg wrote:
>>>
>>>> On 2012-12-19 08:30, Walter Bright wrote:
>>>>
>>>>> https://github.com/D-**Programming-Language/phobos/**pull/1018/files<https://github.com/D-Programming-Language/phobos/pull/1018/files>
>>>>>
>>>>
>>>> Cool, Walter does a pull request. Should this be put in the 
>>>> review queue
>>>> or is this a small enough change to be added anyway?
>>>>
>>>>
>>> Seems a bit overkill to throw it in the review queue, but I 
>>> don't know how
>>> rigorous we want to be about that.
>>>
>>
>> Probably the main point of this module is to demonstrate how 
>> to do new
>> arithmetic types like this without needing compiler support. 
>> It also shows
>> how to do IEEE floating point rounding correctly, which is not 
>> obvious and
>> not trivial.
>>
>>
> How difficult would you think it would be to scale down (or up) 
> this
> library type so it can be an emulated IEEE type of any size? 
> (The whole
> shebang eg: quarter, half, single, double, quad, double-quad, 
> 80bit and
> 96-bit).   Just interested as I think that a module which 
> implements an
> IEEE floating point type that produces constant results 
> cross-platform
> would be better than a dedicated module just for half float 
> types.

What is the difference between std.numeric.CustomFloat and this?