Added luminance

src/include/units/physical/dimensions.h

@@ -137,6 +137,9 @@ struct dim_current_density : derived_dimension<Child, U, exp<I, 1>, exp<L, -2>>
 template<typename Child, Unit U, DimensionOf<dim_substance> M, DimensionOf<dim_length> L>
 struct dim_concentration : derived_dimension<Child, U, exp<M, 1>, exp<L, -3>> {};
 
+template<typename Child, Unit U, DimensionOf<dim_luminous_intensity> I, DimensionOf<dim_length> L>
+struct dim_luminance : derived_dimension<Child, U, exp<I, 1>, exp<L, -2>> {};
+
 }  // namespace physical
 
 template<typename T>
@@ -229,4 +232,7 @@ concept CurrentDensity = physical::QuantityOf<T, physical::dim_current_density>;
 template<typename T>
 concept Concentration = physical::QuantityOf<T, physical::dim_concentration>;
 
+template<typename T>
+concept Luminance = physical::QuantityOf<T, physical::dim_luminance>;
+
 }  // namespace units

src/include/units/physical/si.h

@@ -33,6 +33,7 @@
 #include "si/density.h"
 #include "si/frequency.h"
 #include "si/inductance.h"
+#include "si/luminance.h"
 #include "si/magnetic_flux.h"
 #include "si/magnetic_induction.h"
 #include "si/momentum.h"

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

@@ -0,0 +1,47 @@
+// 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/length.h>
+#include <units/physical/si/luminous_intensity.h>
+#include <units/quantity.h>
+
+namespace units::si {
+
+struct candela_per_metre_sq : unit<candela_per_metre_sq> {};
+struct dim_luminance : physical::dim_luminance<dim_luminance, candela_per_metre_sq, dim_luminous_intensity, dim_length> {};
+
+template<Unit U, Scalar Rep = double>
+using luminance = quantity<dim_luminance, U, Rep>;
+
+inline namespace literals {
+
+// cd/m²
+constexpr auto operator"" q_cd_per_m2(unsigned long long l) { return luminance<candela_per_metre_sq, std::int64_t>(l); }
+constexpr auto operator"" q_cd_per_m2(long double l) { return luminance<candela_per_metre_sq, long double>(l); }
+
+}  // namespace literals
+
+}  // namespace units::si
+

test/unit_test/runtime/fmt_units_test.cpp

@@ -245,6 +245,12 @@ TEST_CASE("fmt::format on synthesized unit symbols", "[text][fmt]")
     CHECK(fmt::format("{:%Q %Aq}", 1q_mol_per_m3) == "1 mol/m^3");
   }
 
+  SECTION("luminance")
+  {
+    CHECK(fmt::format("{}", 1q_cd_per_m2) == "1 cd/m²");
+    CHECK(fmt::format("{:%Q %Aq}", 1q_cd_per_m2) == "1 cd/m^2");
+  }
+
   SECTION("incoherent units with powers")
   {
     CHECK(fmt::format("{}", 1q_mi * 1q_mi * 1q_mi) == "1 [15900351812136/3814697265625 × 10⁹] m³");

test/unit_test/static/si_test.cpp

@@ -304,4 +304,9 @@ static_assert(detail::unit_text<dim_current_density, ampere_per_metre_sq>() == b
 static_assert(1q_mol_per_m3 == 1q_kg_per_m3 * 1q_mol / 1q_kg);
 static_assert(detail::unit_text<dim_concentration, ampere_per_metre_sq>() == basic_symbol_text("mol/m³", "mol/m^2"));
 
+// luminance
+
+static_assert(1q_cd_per_m2 == 1q_cd / 1q_m2);
+static_assert(detail::unit_text<dim_luminance, candela_per_metre_sq>() == basic_symbol_text("cd/m²", "cd/m^2"));
+
 }  // namespace