forked from mpusz/mp-units
96 lines
4.1 KiB
C++
96 lines
4.1 KiB
C++
// The MIT License (MIT)
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//
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// Copyright (c) 2018 Mateusz Pusz
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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#include <units/dimensions/voltage.h>
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#include <units/dimensions/frequency.h>
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#include <units/math.h>
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/* ************** DERIVED DIMENSIONS THAT INCLUDE UNITS WITH SPECIAL NAMES **************** */
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namespace {
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struct base_dim_digital_information { static constexpr const char* value = "digital information"; };
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struct digital_information : units::make_dimension_t<units::exp<base_dim_digital_information, 1>> {};
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template<typename T>
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concept bool DigitalInformation = units::QuantityOf<T, digital_information>;
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struct bit : units::unit<digital_information> {};
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struct byte : units::unit<digital_information, units::ratio<8>> {};
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inline namespace literals {
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constexpr auto operator""_b(unsigned long long l) { return units::quantity<bit, std::int64_t>(l); }
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constexpr auto operator""_b(long double l) { return units::quantity<bit, long double>(l); }
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constexpr auto operator""_B(unsigned long long l) { return units::quantity<byte, std::int64_t>(l); }
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constexpr auto operator""_B(long double l) { return units::quantity<byte, long double>(l); }
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}
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}
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template<> struct units::downcasting_traits<units::downcast_from<digital_information>> : units::downcast_to<digital_information> {};
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template<> struct units::downcasting_traits<units::downcast_from<bit>> : units::downcast_to<bit> {};
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template<> struct units::downcasting_traits<units::downcast_from<::byte>> : units::downcast_to<::byte> {};
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namespace {
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static_assert(1_B == 8_b);
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}
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namespace {
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using namespace units;
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// power spectral density
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struct power_spectral_density : make_dimension_t<units::exp<voltage, 2>, units::exp<frequency, -1>> {};
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struct sq_volt_per_hertz : unit<power_spectral_density> {};
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// amplitude spectral density
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struct amplitude_spectral_density : make_dimension_t<units::exp<voltage, 1>, units::exp<frequency, -1, 2>> {};
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// todo: add support for derived_unit
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//struct volt_per_sq_hertz : derived_unit<amplitude_spectral_density, kilogram, metre, second, ampere> {};
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struct volt_per_sqrt_hertz : unit<amplitude_spectral_density> {};
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}
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namespace units {
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template<> struct downcasting_traits<downcast_from<power_spectral_density>> : downcast_to<power_spectral_density> {};
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template<> struct downcasting_traits<downcast_from<sq_volt_per_hertz>> : downcast_to<sq_volt_per_hertz> {};
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template<> struct downcasting_traits<downcast_from<amplitude_spectral_density>> : downcast_to<amplitude_spectral_density> {};
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template<> struct downcasting_traits<downcast_from<volt_per_sqrt_hertz>> : downcast_to<volt_per_sqrt_hertz> {};
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}
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namespace {
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static_assert(std::is_same_v<dimension_sqrt_t<power_spectral_density>, amplitude_spectral_density>);
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static_assert(std::is_same_v<dimension_pow_t<amplitude_spectral_density, 2>, power_spectral_density>);
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static_assert(std::is_same_v<decltype(pow<2>(quantity<volt_per_sqrt_hertz>(4))), decltype(quantity<sq_volt_per_hertz>(16))>);
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static_assert(std::is_same_v<decltype(sqrt(quantity<sq_volt_per_hertz>(16))), decltype(quantity<volt_per_sqrt_hertz>(4))>);
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}
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