luminance.h

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//--------------------------------------------------------------------------------------------------
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//  UnitConversion: A compile-time c++23 unit conversion library with no dependencies
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// Copyright (c) 2016 Nic Holthaus
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// ATTRIBUTION:
// Parts of this work have been adapted from:
// http://stackoverflow.com/questions/35069778/create-comparison-trait-for-template-classes-whose-parameters-are-in-a-different
// http://stackoverflow.com/questions/28253399/check-traits-for-all-variadic-template-arguments/28253503
// http://stackoverflow.com/questions/36321295/rational-approximation-of-square-root-of-stdratio-at-compile-time?noredirect=1#comment60266601_36321295
// https://en.wikipedia.org/wiki/Luminance
// https://github.com/swatanabe/cppnow17-units
//
//--------------------------------------------------------------------------------------------------
//
//
//--------------------------------------------------------------------------------------------------
 
#pragma once
 
#ifndef units_luminance_h_
#define units_luminance_h__
 
#include <units/length.h>
#include <units/luminous_intensity.h>
 
namespace units
{
    UNIT_ADD_WITH_METRIC_PREFIXES(luminance, candelas_per_square_meter, cd_per_m2, conversion_factor<std::ratio<1>, dimension::luminance>)
    UNIT_ADD(luminance, stilbs, sb, conversion_factor<std::ratio<10'000>, candelas_per_square_meter_>)
    UNIT_ADD(luminance, apostilbs, asb, conversion_factor<std::ratio<1>, candelas_per_square_meter_, std::ratio<-1>>)
    UNIT_ADD(luminance, brils, bril, conversion_factor<std::ratio<1, 10'000'000>, candelas_per_square_meter<>, std::ratio<-1>>)
    UNIT_ADD(luminance, skots, sk, conversion_factor<std::ratio<1, 1'000>, candelas_per_square_meter<>, std::ratio<-1>>)
    UNIT_ADD(luminance, lamberts, la, conversion_factor<std::ratio<1>, stilbs<>, std::ratio<-1>>)
    UNIT_ADD(luminance, millilamberts, mla, conversion_factor<std::ratio<1, 1'000>, lamberts<>>)
    UNIT_ADD(luminance, foot_lamberts, ftL, compound_conversion_factor<conversion_factor<std::ratio<1>, dimension::dimensionless, std::ratio<-1>>, candelas<>, inverse<squared<feet<>>>>)
 
    // Aliases
    template<class T>
    using nits = candelas_per_square_meter<T>;
 
    template<class T>
    using blondels = apostilbs<T>;
 
    UNIT_ADD_DIMENSION_TRAIT(luminance, Luminance)
} // namespace units
 
#endif // units_luminance_h__