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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


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

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