Re: [boost] Fixed-Point Decimal Type

From: Gabriel Dos Reis (Gabriel.Dos-Reis_at_[hidden])
Date: 2001-05-15 10:29:46

Beman Dawes <bdawes_at_[hidden]> writes:

|  >	This is problematic. For some operations, it is
|  >wrong to always round 1/2 LSD up: when doing statistical
|  >operations, rounding up or down at random is correct.
|  >Sometimes, truncation is correct (rather than rounding).
|  >
|  >	This suggests that you pick one mode (as you have)
|  >for the operator?? forms, but supply the other operations
|  >as named functions, for example
|  >
|  >	mul_with_truncate(a,b)
|  >	mul_with_rhlsd_up(a,b)
|  >	mul_with_rhlsd_ran(a,b)
|  >	mul_with_noround(a,b)
| 
| Maybe.  But maybe just stick with one form of rounding, unless there really 
| is some overwhelming need for additional forms.

Hi Beman,

I think the ability of choosing rounding mode should not be
overlooked.  It is an essential part of LIA-1 and later standards.

-- Gaby