core/mtcore/units/time.hpp

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/*
 
Copyright 2025 Matthew Tolman
 
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
 
   http://www.apache.org/licenses/LICENSE-2.0
 
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
 
*/
 
#ifndef MTCORE_UNITS_TIME_HPP
#define MTCORE_UNITS_TIME_HPP
 
#include "mtcore/units/base.hpp"
 
namespace mtcore::units {
  namespace time {
    constexpr auto attosecond  = Units<Unit<dimensions::TIME, std::atto>>{};
    constexpr auto femtosecond = Units<Unit<dimensions::TIME, std::femto>>{};
    constexpr auto picosecond  = Units<Unit<dimensions::TIME, std::pico>>{};
    constexpr auto nanosecond  = Units<Unit<dimensions::TIME, std::nano>>{};
    constexpr auto microsecond = Units<Unit<dimensions::TIME, std::micro>>{};
    constexpr auto millisecond = Units<Unit<dimensions::TIME, std::milli>>{};
    constexpr auto centisecond = Units<Unit<dimensions::TIME, std::centi>>{};
    constexpr auto decisecond  = Units<Unit<dimensions::TIME, std::deci>>{};
    constexpr auto second      = Units<Unit<dimensions::TIME>>{};
    constexpr auto decasecond  = Units<Unit<dimensions::TIME, std::deca>>{};
    constexpr auto hectosecond = Units<Unit<dimensions::TIME, std::hecto>>{};
    constexpr auto kilosecond  = Units<Unit<dimensions::TIME, std::kilo>>{};
    constexpr auto megasecond  = Units<Unit<dimensions::TIME, std::mega>>{};
    constexpr auto gigasecond  = Units<Unit<dimensions::TIME, std::giga>>{};
    constexpr auto terasecond  = Units<Unit<dimensions::TIME, std::tera>>{};
    constexpr auto petasecond  = Units<Unit<dimensions::TIME, std::peta>>{};
    constexpr auto exasecond   = Units<Unit<dimensions::TIME, std::exa>>{};
 
    constexpr auto minute     = Units<Unit<dimensions::TIME, std::ratio<60>>>{};
    constexpr auto hour       = Units<Unit<dimensions::TIME, std::ratio<3600>>>{};
    constexpr auto day        = Units<Unit<dimensions::TIME, std::ratio<86400>>>{};
    constexpr auto week       = Units<Unit<dimensions::TIME, std::ratio<604800>>>{};
    constexpr auto fortnight  = Units<Unit<dimensions::TIME, std::ratio<1209600>>>{};
    constexpr auto quarantine = Units<Unit<dimensions::TIME, std::ratio<48384000>>>{};
    constexpr auto semester   = Units<Unit<dimensions::TIME, std::ratio<10886400>>>{};
  }  // namespace time
 
  MTCORE_DEF_UNIT_NAME_SI(time, second, second, s)
  MTCORE_DEF_UNIT_NAME_DIFF_US(time, attosecond, attosecond, as);
  MTCORE_DEF_UNIT_NAME_DIFF_US(time, exasecond, exasecond, Es);
  MTCORE_DEF_UNIT_NAME(time, minute, min)
  MTCORE_DEF_UNIT_NAME(time, hour, hr)
  MTCORE_DEF_UNIT_NAME(time, day, d)
  MTCORE_DEF_UNIT_NAME(time, week, w)
  MTCORE_DEF_UNIT_NAME_NO_ABBREV(time, fortnight)
  MTCORE_DEF_UNIT_NAME_NO_ABBREV(time, quarantine)
  MTCORE_DEF_UNIT_NAME_NO_ABBREV(time, semester)
 
  static_assert(1. * time::second + 1. * time::second == 2 * time::second);
 
  static_assert(1. * length::meter / time::second + 1. * length::meter / time::second ==
                2 * length::meter / time::second);
 
  static_assert(1. * length::meter / time::second + 1. * length::meter / time::second ==
                20 * length::decimeter / time::second);
  static_assert(
    impl::GetUnit<dimensions::TIME, Units<impl::FlipUnit<decltype(time::millisecond)::Head>::T>>::exponent == -1);
  static_assert(impl::GetUnit<dimensions::TIME, decltype(length::decimeter / time::millisecond)>::exponent == -1);
  static_assert(impl::GetUnit<dimensions::LENGTH, decltype(length::decimeter / time::millisecond)>::exponent == 1);
 
  static_assert((1. * length::meter / time::second + 1. * length::meter / time::second)
                  .to(length::decimeter / time::millisecond)
                  .val == 0.02);
 
  static_assert(1. * length::meter / time::second + 1. * length::meter / time::second ==
                0.02 * length::decimeter / time::millisecond);
}  // namespace mtcore::units
 
#endif  // MTCORE_UNITS_TIME_HPP