Added electric field strength

src/include/units/physical/dimensions.h

@@ -152,6 +152,12 @@ struct dim_specific_heat_capacity : derived_dimension<Child, U, exp<C, 1>, exp<M
 template<typename Child, Unit U, DimensionOf<dim_power> P, DimensionOf<dim_length> L, DimensionOf<dim_thermodynamic_temperature> T>
 struct dim_thermal_conductivity : derived_dimension<Child, U, exp<P, 1>, exp<L, -1>, exp<T, -1>> {};
 
+template<typename Child, Unit U, DimensionOf<dim_energy> E, DimensionOf<dim_length> L>
+struct dim_energy_density : derived_dimension<Child, U, exp<E, 1>, exp<L, -3>> {};
+
+template<typename Child, Unit U, DimensionOf<dim_voltage> V, DimensionOf<dim_length> L>
+struct dim_electric_field_strength : derived_dimension<Child, U, exp<V, 1>, exp<L, -1>> {};
+
 }  // namespace physical
 
 template<typename T>
@@ -199,6 +205,9 @@ concept Momentum = physical::QuantityOf<T, physical::dim_momentum>;
 template<typename T>
 concept Energy = physical::QuantityOf<T, physical::dim_energy>;
 
+template<typename T>
+concept Density = physical::QuantityOf<T, physical::dim_density>;
+
 template<typename T>
 concept Power = physical::QuantityOf<T, physical::dim_power>;
 
@@ -259,4 +268,10 @@ concept SpecificHeatCapacity = physical::QuantityOf<T, physical::dim_specific_he
 template<typename T>
 concept ThermalConductivity = physical::QuantityOf<T, physical::dim_thermal_conductivity>;
 
+// template<typename T>
+// concept EnergyDensity = physical::QuantityOf<T, physical::dim_energy_density>;
+
+template<typename T>
+concept ElectricFieldStrength = physical::QuantityOf<T, physical::dim_electric_field_strength>;
+
 }  // namespace units

src/include/units/physical/si.h

@@ -32,6 +32,7 @@
 #include "si/current_density.h"
 #include "si/density.h"
 #include "si/dynamic_viscosity.h"
+#include "si/electric_field_strength.h"
 #include "si/frequency.h"
 #include "si/heat_capacity.h"
 #include "si/inductance.h"

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

@@ -0,0 +1,45 @@
+// 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/voltage.h>
+#include <units/quantity.h>
+
+namespace units::si {
+
+struct volt_per_metre : unit<volt_per_metre> {};
+struct dim_electric_field_strength : physical::dim_electric_field_strength<dim_electric_field_strength, volt_per_metre, dim_voltage, dim_length> {};
+
+template<Unit U, Scalar Rep = double>
+using electric_field_strength = quantity<dim_electric_field_strength, U, Rep>;
+
+inline namespace literals {
+
+// V/m
+constexpr auto operator"" q_V_per_m(unsigned long long l) { return electric_field_strength<volt_per_metre, std::int64_t>(l); }
+constexpr auto operator"" q_V_per_m(long double l) { return electric_field_strength<volt_per_metre, long double>(l); }
+
+}  // namespace literals
+
+}  // namespace units::si