Re: [boost] Using units prefix dynamically to get the appropriate prefix for the size of the value?

Subject: Re: [boost] Using units prefix dynamically to get the appropriate prefix for the size of the value?
From: Steven Watanabe (watanabesj_at_[hidden])
Date: 2009-11-23 09:56:48

AMDG

Paul A. Bristow wrote:
> I'd like to use the units library prefix (k, M, G ...) system, but I'd really
> like to determine the prefix dynamically (automatically) depending on the value.
>
> For example, if I have a length of 12300 m I'd like an output of "12.3 km"  but
> if my length is 0.0123 m, I'd like an output of "12.3 mm".
>
> I can't see how to do this (and including the correct length unit of m or meter
> of course).
>
> Suggestions?
>   

There is no way to do this right now.  Currently the
output operator completely separates printing the
value from printing the unit.  Feel free to add a
feature request in trac.  I can't think of a good name
for a stream manipulator off hand.

In Christ,
Steven Watanabe