Added heat capacity and specific heat capacity

src/include/units/physical/si/heat_capacity.h

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+// The MIT License (MIT)
+//
+// Copyright (c) 2018 Mateusz Pusz
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+#pragma once
+
+#include <units/physical/dimensions.h>
+#include <units/physical/si/temperature.h>
+#include <units/physical/si/energy.h>
+#include <units/physical/si/mass.h>
+#include <units/quantity.h>
+
+namespace units::si {
+
+struct joule_per_kelvin : unit<joule_per_kelvin> {};
+struct joule_per_kilogram_kelvin : unit<joule_per_kilogram_kelvin> {};
+
+struct dim_heat_capacity : physical::dim_heat_capacity<dim_heat_capacity, joule_per_kelvin, dim_energy, dim_thermodynamic_temperature> {};
+struct dim_specific_heat_capacity : physical::dim_specific_heat_capacity<dim_specific_heat_capacity, joule_per_kilogram_kelvin, dim_heat_capacity, dim_mass> {};
+
+template<Unit U, Scalar Rep = double>
+using heat_capacity = quantity<dim_heat_capacity, U, Rep>;
+
+template<Unit U, Scalar Rep = double>
+using specific_heat_capacity = quantity<dim_specific_heat_capacity, U, Rep>;
+
+inline namespace literals {
+
+// J/K
+constexpr auto operator"" q_J_per_K(unsigned long long l) { return heat_capacity<joule_per_kelvin, std::int64_t>(l); }
+constexpr auto operator"" q_J_per_K(long double l) { return heat_capacity<joule_per_kelvin, long double>(l); }
+
+// J/(kg·K)
+constexpr auto operator"" q_J_per_kg_K(unsigned long long l) { return specific_heat_capacity<joule_per_kilogram_kelvin, std::int64_t>(l); }
+constexpr auto operator"" q_J_per_kg_K(long double l) { return specific_heat_capacity<joule_per_kilogram_kelvin, long double>(l); }
+
+}  // namespace literals
+
+}  // namespace units::si
+