Scaled Unit Constants
Built-in unit constants, for use with conversions
Context
Introduction
Built-in units. Application code may use these to trigger conversion
#include <xo/unit/quantity.hpp>
using namespace xo::qty;
constexpr quantity<u::meter / u::second> q1 = q::miles(60) / q::hour;
Note that it’s often easiest to use unit quantity constants,
like q::hour in the example above
Dimensionless Constant
- group scaled-unit dimensionless constant
Variables
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auto dimensionless = detail::su_promote(natural_unit<std::int64_t>())
dimensionless unit; equivalent to 1
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auto dimensionless = detail::su_promote(natural_unit<std::int64_t>())
Mass Units
- group scaled-unit mass units
Variables
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auto picogram = su_from_bu(detail::bu::picogram)
unit of 10^-12 grams
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auto nanogram = su_from_bu(detail::bu::nanogram)
unit of 10^-9 grams
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auto microgram = su_from_bu(detail::bu::microgram)
unit of 10^-6 grams
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auto milligram = su_from_bu(detail::bu::milligram)
unit of 10^-3 grams
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auto gram = su_from_bu(detail::bu::gram)
unit of 1 gram
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auto kilogram = su_from_bu(detail::bu::kilogram)
unit of 10^3 grams
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auto tonne = su_from_bu(detail::bu::tonne)
unit of 1 metric tonne = 10^3 kg
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auto kilotonne = su_from_bu(detail::bu::kilotonne)
unit of 10^3 tonnes = 10^6 kg
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auto megatonne = su_from_bu(detail::bu::megatonne)
unit of 10^6 tonnes = 10^9 kg
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auto gigatonne = su_from_bu(detail::bu::gigatonne)
unit of 10^9 tonnes = 10^12 kg
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auto picogram = su_from_bu(detail::bu::picogram)
Distance Units
- group scaled-unit distance units
Variables
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auto picometer = su_from_bu(detail::bu::picometer)
unit of 10^-12 meters
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auto nanometer = su_from_bu(detail::bu::nanometer)
unit of 10^-9 meters
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auto micrometer = su_from_bu(detail::bu::micrometer)
unit of 10^-6 meters
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auto millimeter = su_from_bu(detail::bu::millimeter)
unit of 10^-3 meters
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auto meter = su_from_bu(detail::bu::meter)
unit of 1 meter
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auto kilometer = su_from_bu(detail::bu::kilometer)
unit of 10^3 meters
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auto megameter = su_from_bu(detail::bu::megameter)
unit of 10^6 meters (not commonly used)
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auto gigameter = su_from_bu(detail::bu::gigameter)
unit of 10^9 meters (not commonly used)
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auto lightsecond = su_from_bu(detail::bu::lightsecond)
unit of 1 light-second = distance light travels in a vacuum in 1 second
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auto astronomicalunit = su_from_bu(detail::bu::astronomicalunit)
unit of 1 astronomical unit, for approximate radius of earth orbit
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auto inch = su_from_bu(detail::bu::inch)
unit of 1 inch = 1/12 feet
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auto foot = su_from_bu(detail::bu::foot)
unit of 1 foot = 0.3048 meters
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auto yard = su_from_bu(detail::bu::yard)
unit of 1 yard = 3 feet
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auto mile = su_from_bu(detail::bu::mile)
unit of 1 mile = 1760 yards
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auto picometer = su_from_bu(detail::bu::picometer)
Time Units
- group scaled-unit time units
Variables
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auto picosecond = su_from_bu(detail::bu::picosecond)
unit of 1 picosecond = 10^-12 seconds
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auto nanosecond = su_from_bu(detail::bu::nanosecond)
unit of 1 nanosecond = 10^-9 seconds
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auto microsecond = su_from_bu(detail::bu::microsecond)
unit of 1 microseccond = 10^-6 seconds
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auto millisecond = su_from_bu(detail::bu::millisecond)
unit of 1 millisecond = 10^-3 seconds
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auto second = su_from_bu(detail::bu::second)
unit of 1 second
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auto minute = su_from_bu(detail::bu::minute)
unit of 1 minute
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auto hour = su_from_bu(detail::bu::hour)
unit of 1 hour
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auto day = su_from_bu(detail::bu::day)
unit for a 24-hour day
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auto week = su_from_bu(detail::bu::week)
unit for a week comprising exactly 7 24-hour days
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auto month = su_from_bu(detail::bu::month)
unit for a 30-day month
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auto year = su_from_bu(detail::bu::year)
unit for a year containing exactly 365.25 24-hour days
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auto year250 = su_from_bu(detail::bu::year250)
unit for a ‘year’ containing exactly 250 24-hour days. (approximates the number of business days in a year)
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auto year360 = su_from_bu(detail::bu::year360)
unit for a ‘year’ containing exactly 360 24-hour days
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auto year365 = su_from_bu(detail::bu::year365)
unit for a ‘year’ containing exactly 365 24-hour days
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auto picosecond = su_from_bu(detail::bu::picosecond)
Volatility Units
- group scaled-unit volatility units
Variables
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auto volatility_30d = su_from_bu(detail::bu::month, power_ratio_type(-1, 2))
volatility, in 30-day units
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auto volatility_250d = su_from_bu(detail::bu::year250, power_ratio_type(-1, 2))
volatility, in 250-day ‘annual’ units
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auto volatility_360d = su_from_bu(detail::bu::year360, power_ratio_type(-1, 2))
volatility, in 360-day ‘annual’ units
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auto volatility_365d = su_from_bu(detail::bu::year365, power_ratio_type(-1, 2))
volatility, in 365-day ‘annual’ units
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auto volatility_30d = su_from_bu(detail::bu::month, power_ratio_type(-1, 2))
Miscellaneous Units
- group scaled-unit miscellaneous units