mp-units/src/include/units/generic/angle.h

// 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
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// SOFTWARE.

#pragma once

#include <units/physical/si/prefixes.h>
#include <units/quantity.h>

namespace units {

struct radian : named_unit<radian, "rad", physical::si::prefix> {};

template<Unit U = radian>
struct dim_angle : base_dimension<"A", U> {};

template<typename T>
concept Angle = QuantityOfT<T, dim_angle>;

template<UnitOf<dim_angle<>> U, QuantityValue Rep = double>
using angle = quantity<dim_angle<>, U, Rep>;

inline namespace literals {

// rad
constexpr auto operator"" _q_rad(unsigned long long l) { gsl_Expects(std::in_range<std::int64_t>(l)); return angle<radian, std::int64_t>(static_cast<std::int64_t>(l)); }
constexpr auto operator"" _q_rad(long double l) { return angle<radian, long double>(l); }


}  // namespace literals

}  // namespace units