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// (C) Copyright Matt Borland 2022.
// Use, modification and distribution are subject to 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)
#ifndef BOOST_MATH_CCMATH_ISLESS_HPP
#define BOOST_MATH_CCMATH_ISLESS_HPP
#include <boost/math/ccmath/detail/config.hpp>
#ifdef BOOST_MATH_NO_CCMATH
#error "The header <boost/math/isless.hpp> can only be used in C++17 and later."
#endif
#include <boost/math/ccmath/isnan.hpp>
namespace boost::math::ccmath {
template <typename T1, typename T2 = T1>
inline constexpr bool isless(T1 x, T2 y) noexcept
{
if (BOOST_MATH_IS_CONSTANT_EVALUATED(x))
{
if (boost::math::ccmath::isnan(x) || boost::math::ccmath::isnan(y))
{
return false;
}
else
{
return x < y;
}
}
else
{
using std::isless;
return isless(x, y);
}
}
} // Namespaces
#endif // BOOST_MATH_CCMATH_ISLESS_HPP
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