detray::constant< scalar_t > Struct Template Reference

Physical and mathematical constants. More...

#include <detray/definitions/units.hpp>

Collaboration diagram for detray::constant< scalar_t >:

Static Public Attributes
static constexpr scalar_t	avogadro
	Avogadro constant.
static constexpr scalar_t	e {static_cast<scalar_t>(std::numbers::e)}
	Euler's number.
static constexpr scalar_t	hbar
	Reduced Planck constant h/2*pi.
static constexpr scalar_t	inv_2_pi
	2/π
static constexpr scalar_t	inv_pi
	1/π
static constexpr scalar_t	inv_sqrt2
	1/(√2)
static constexpr scalar_t	ln10 {static_cast<scalar_t>(std::numbers::ln10)}
	Natural logarithm of 10.
static constexpr scalar_t	ln2 {static_cast<scalar_t>(std::numbers::ln2)}
	Natural logarithm of 2.
static constexpr scalar_t	log10e {static_cast<scalar_t>(std::numbers::log10e)}
	Base 10 logarithm of e.
static constexpr scalar_t	log2e {static_cast<scalar_t>(std::numbers::log2e)}
	Base 2 logarithm of e.
static constexpr scalar_t	m_e
	Electron rest energy expressed in the internal energy unit.
static constexpr scalar_t	pi {static_cast<scalar_t>(std::numbers::pi)}
	π
static constexpr scalar_t	pi_2 {static_cast<scalar_t>(std::numbers::pi / 2.)}
	π/2
static constexpr scalar_t	pi_4 {static_cast<scalar_t>(std::numbers::pi / 4.)}
	π/4
static constexpr scalar_t	sqrt2 {static_cast<scalar_t>(std::numbers::sqrt2)}
	√2

Detailed Description

template<concepts::scalar scalar_t>
struct detray::constant< scalar_t >

Physical and mathematical constants.

Member Data Documentation

avogadro

template<concepts::scalar scalar_t>

scalar_t detray::constant< scalar_t >::avogadro

staticconstexpr

Initial value:

{
      static_cast<scalar_t>(6.02214076e23 / unit<scalar_t>::mol)}

Avogadro constant.

hbar

template<concepts::scalar scalar_t>

scalar_t detray::constant< scalar_t >::hbar

staticconstexpr

Initial value:

{static_cast<scalar_t>(
      6.582119569509066e-25 * unit<scalar_t>::GeV * unit<scalar_t>::s)}

Reduced Planck constant h/2*pi.

Computed from CODATA 2018 constants to double precision.

inv_2_pi

template<concepts::scalar scalar_t>

scalar_t detray::constant< scalar_t >::inv_2_pi

staticconstexpr

Initial value:

{
      static_cast<scalar_t>(2. / std::numbers::pi)}

2/π

inv_pi

template<concepts::scalar scalar_t>

scalar_t detray::constant< scalar_t >::inv_pi

staticconstexpr

Initial value:

{
      static_cast<scalar_t>(1. / std::numbers::pi)}

1/π

inv_sqrt2

template<concepts::scalar scalar_t>

scalar_t detray::constant< scalar_t >::inv_sqrt2

staticconstexpr

Initial value:

{
      static_cast<scalar_t>(1. / std::numbers::sqrt2)}

1/(√2)

m_e

template<concepts::scalar scalar_t>

scalar_t detray::constant< scalar_t >::m_e

staticconstexpr

Initial value:

{
      static_cast<scalar_t>(0.51099895069 * unit<scalar_t>::MeV)}

Electron rest energy expressed in the internal energy unit.