mp-units/example/si_constants.cpp

// The MIT License (MIT)
//
// Copyright (c) 2018 Mateusz Pusz
//
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// of this software and associated documentation files (the "Software"), to deal
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// furnished to do so, subject to the following conditions:
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#include <mp-units/format.h>
#include <mp-units/systems/si/constants.h>
#include <mp-units/systems/si/unit_symbols.h>
#include <iostream>

template<class T>
  requires mp_units::is_scalar<T>
inline constexpr bool mp_units::is_vector<T> = true;

int main()
{
  using namespace mp_units::si;
  using namespace mp_units::si::unit_symbols;

  std::cout << "The seven defining constants of the SI and the seven corresponding units they define:\n";
  std::cout << UNITS_STD_FMT::format("- hyperfine transition frequency of Cs: {} = {:%.0Q %q}\n",
                                     1. * si2019::hyperfine_structure_transition_frequency_of_cs,
                                     (1. * si2019::hyperfine_structure_transition_frequency_of_cs)[Hz]);
  std::cout << UNITS_STD_FMT::format("- speed of light in vacuum:             {} = {:%.0Q %q}\n",
                                     1. * si2019::speed_of_light_in_vacuum,
                                     (1. * si2019::speed_of_light_in_vacuum)[m / s]);
  std::cout << UNITS_STD_FMT::format("- Planck constant:                      {} = {:%.8eQ %q}\n",
                                     1. * si2019::planck_constant, (1. * si2019::planck_constant)[J * s]);
  std::cout << UNITS_STD_FMT::format("- elementary charge:                    {} = {:%.9eQ %q}\n",
                                     1. * si2019::elementary_charge, (1. * si2019::elementary_charge)[C]);
  std::cout << UNITS_STD_FMT::format("- Boltzmann constant:                   {} = {:%.6eQ %q}\n",
                                     1. * si2019::boltzmann_constant, (1. * si2019::boltzmann_constant)[J / K]);
  std::cout << UNITS_STD_FMT::format("- Avogadro constant:                    {} = {:%.8eQ %q}\n",
                                     1. * si2019::avogadro_constant, (1. * si2019::avogadro_constant)[1 / mol]);
  // TODO uncomment the below when ISQ is done
  // std::cout << UNITS_STD_FMT::format("- luminous efficacy:                    {} = {}\n",
  // si2019::luminous_efficacy(1.),
  //                              si2019::luminous_efficacy(1.)[lm / W]);
}