mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
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87 lines
3.1 KiB
C++
87 lines
3.1 KiB
C++
/*=============================================================================
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Copyright (c) 2011-2015 Bolero MURAKAMI
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https://github.com/bolero-MURAKAMI/Sprout
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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=============================================================================*/
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#ifndef SPROUT_MATH_LESS_HPP
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#define SPROUT_MATH_LESS_HPP
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#include <type_traits>
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#include <sprout/config.hpp>
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#include <sprout/math/not_equal_to.hpp>
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#include <sprout/type_traits/arithmetic_promote.hpp>
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#include <sprout/type_traits/enabler_if.hpp>
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#include <sprout/type_traits/is_signed.hpp>
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#include <sprout/type_traits/is_unsigned.hpp>
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namespace sprout {
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namespace math {
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namespace detail {
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template<
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typename FloatType1, typename FloatType2,
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typename sprout::enabler_if<
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std::is_floating_point<typename sprout::arithmetic_promote<FloatType1, FloatType2>::type>::value
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>::type = sprout::enabler
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>
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inline SPROUT_CONSTEXPR bool
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less(FloatType1 x, FloatType2 y) {
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return sprout::math::not_equal_to(x, y) && x < y;
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}
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template<
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typename IntType1, typename IntType2,
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typename sprout::enabler_if<
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std::is_integral<typename sprout::arithmetic_promote<IntType1, IntType2>::type>::value
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&& (sprout::is_unsigned<IntType1>::value == sprout::is_unsigned<IntType2>::value)
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>::type = sprout::enabler
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>
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inline SPROUT_CONSTEXPR bool
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less(IntType1 x, IntType2 y) {
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return x < y;
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}
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template<
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typename IntType1, typename IntType2,
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typename sprout::enabler_if<
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std::is_integral<typename sprout::arithmetic_promote<IntType1, IntType2>::type>::value
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&& sprout::is_signed<IntType1>::value && sprout::is_unsigned<IntType2>::value
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>::type = sprout::enabler
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>
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inline SPROUT_CONSTEXPR bool
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less(IntType1 x, IntType2 y) {
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typedef typename std::make_unsigned<typename sprout::arithmetic_promote<IntType1, IntType2>::type>::type type;
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return x < 0 ? true
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: static_cast<type>(x) < static_cast<type>(y)
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;
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}
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template<
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typename IntType1, typename IntType2,
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typename sprout::enabler_if<
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std::is_integral<typename sprout::arithmetic_promote<IntType1, IntType2>::type>::value
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&& sprout::is_unsigned<IntType1>::value && sprout::is_signed<IntType2>::value
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>::type = sprout::enabler
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>
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inline SPROUT_CONSTEXPR bool
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less(IntType1 x, IntType2 y) {
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typedef typename std::make_unsigned<typename sprout::arithmetic_promote<IntType1, IntType2>::type>::type type;
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return y < 0 ? false
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: static_cast<type>(x) < static_cast<type>(y)
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;
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}
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} // namespace detail
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//
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// less
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//
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template<
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typename T, typename U,
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typename sprout::enabler_if<std::is_arithmetic<T>::value && std::is_arithmetic<U>::value>::type = sprout::enabler
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>
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inline SPROUT_CONSTEXPR bool
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less(T x, U y) {
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return sprout::math::detail::less(x, y);
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}
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} // namespace math
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} // namespace sprout
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#endif // #ifndef SPROUT_MATH_LESS_HPP
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