Re: [Boost-users] boost::units - converting from one derived_dimension to another across systems (imperial to metric)

On Tue, 20 Nov 2018 at 12:37, degski wrote:

On Tue, 20 Nov 2018 at 10:31, degski wrote:

...

The new value [as of 20 May 2019] of the Planck constant by the ISO standard is set to 6.626 070 150 x 10-34 J⋅s.

The currently defined value is:

/// Planck constant

BOOST_UNITS_PHYSICAL_CONSTANT(h,quantity,6.62606896e-34*joule*seconds,3.3e-41*joule*seconds);

Hmmm, that's not a fun problem, thinking about it [in terms of Boost releases of before and after 20th of May 2019].

The "new" Planck constant works pretty well with IEEE754, it [6.626 070 150 x 10-3] will be represented as 6.62607014999999983e-34, so not bad. degski -- *“If something cannot go on forever, it will stop" - Herbert Stein*