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Sprout/sprout/math/greater_equal.hpp

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/*=============================================================================
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Copyright (c) 2011-2016 Bolero MURAKAMI
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https://github.com/bolero-MURAKAMI/Sprout
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
=============================================================================*/
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#ifndef SPROUT_MATH_GREATER_EQUAL_HPP
#define SPROUT_MATH_GREATER_EQUAL_HPP
#include <type_traits>
#include <sprout/config.hpp>
#include <sprout/math/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>
#include <sprout/type_traits/is_unsigned.hpp>
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namespace sprout {
namespace math {
namespace detail {
template<
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typename FloatType1, typename FloatType2,
typename sprout::enabler_if<
std::is_floating_point<typename sprout::arithmetic_promote<FloatType1, FloatType2>::type>::value
>::type = sprout::enabler
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>
inline SPROUT_CONSTEXPR bool
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greater_equal(FloatType1 x, FloatType2 y) {
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return sprout::math::equal_to(x, y) || x > y;
}
template<
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typename IntType1, typename IntType2,
typename sprout::enabler_if<
std::is_integral<typename sprout::arithmetic_promote<IntType1, IntType2>::type>::value
&& (sprout::is_unsigned<IntType1>::value == sprout::is_unsigned<IntType2>::value)
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>::type = sprout::enabler
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>
inline SPROUT_CONSTEXPR bool
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greater_equal(IntType1 x, IntType2 y) {
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return x >= y;
}
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template<
typename IntType1, typename IntType2,
typename sprout::enabler_if<
std::is_integral<typename sprout::arithmetic_promote<IntType1, IntType2>::type>::value
&& sprout::is_signed<IntType1>::value && sprout::is_unsigned<IntType2>::value
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>::type = sprout::enabler
>
inline SPROUT_CONSTEXPR bool
greater_equal(IntType1 x, IntType2 y) {
typedef typename std::make_unsigned<typename sprout::arithmetic_promote<IntType1, IntType2>::type>::type type;
return x < 0 ? false
: static_cast<type>(x) >= static_cast<type>(y)
;
}
template<
typename IntType1, typename IntType2,
typename sprout::enabler_if<
std::is_integral<typename sprout::arithmetic_promote<IntType1, IntType2>::type>::value
&& sprout::is_unsigned<IntType1>::value && sprout::is_signed<IntType2>::value
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>::type = sprout::enabler
>
inline SPROUT_CONSTEXPR bool
greater_equal(IntType1 x, IntType2 y) {
typedef typename std::make_unsigned<typename sprout::arithmetic_promote<IntType1, IntType2>::type>::type type;
return y < 0 ? true
: static_cast<type>(x) >= static_cast<type>(y)
;
}
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} // namespace detail
//
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// greater_equal
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//
template<
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typename T, typename U,
typename sprout::enabler_if<std::is_arithmetic<T>::value && std::is_arithmetic<U>::value>::type = sprout::enabler
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>
inline SPROUT_CONSTEXPR bool
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greater_equal(T x, U y) {
return sprout::math::detail::greater_equal(x, y);
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}
} // namespace math
} // namespace sprout
#endif // #ifndef SPROUT_MATH_GREATER_EQUAL_HPP