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Sprout/sprout/math/less.hpp
2012-07-06 23:10:49 +09:00

47 lines
1.3 KiB
C++

#ifndef SPROUT_MATH_LESS_HPP
#define SPROUT_MATH_LESS_HPP
#include <type_traits>
#include <sprout/config.hpp>
#include <sprout/math/not_equal_to.hpp>
#include <sprout/math/float_promote.hpp>
#include <sprout/type_traits/enabler_if.hpp>
namespace sprout {
namespace math {
namespace detail {
template<
typename FloatType,
typename sprout::enabler_if<std::is_floating_point<FloatType>::value>::type = sprout::enabler
>
inline SPROUT_CONSTEXPR bool
less(FloatType x, FloatType y) {
return sprout::math::not_equal_to(x, y) && x < y;
}
template<
typename IntType,
typename sprout::enabler_if<std::is_integral<IntType>::value>::type = sprout::enabler
>
inline SPROUT_CONSTEXPR bool
less(IntType x, IntType y) {
return x < y;
}
} // namespace detail
//
// less
//
template<
typename T1,
typename T2,
typename sprout::enabler_if<std::is_arithmetic<T1>::value && std::is_arithmetic<T2>::value>::type = sprout::enabler
>
inline SPROUT_CONSTEXPR bool
less(T1 x, T2 y) {
typedef typename sprout::math::float_promote<T1, T2>::type promoted;
return sprout::math::detail::less<promoted>(x, y);
}
} // namespace math
} // namespace sprout
#endif // #ifndef SPROUT_MATH_LESS_HPP