On Tue, 20 Nov 2018 at 10:31, degski <degski@gmail.com> 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<energy_time>,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].