boost/math/ccmath/isinf.hpp
// (C) Copyright Matt Borland 2021.
// 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_ISINF
#define BOOST_MATH_CCMATH_ISINF
#include <boost/math/special_functions/fpclassify.hpp>
#include <boost/math/ccmath/detail/config.hpp>
#ifdef BOOST_MATH_NO_CCMATH
#error "The header <boost/math/isinf.hpp> can only be used in C++17 and later."
#endif
namespace boost::math::ccmath {
template <typename T>
constexpr bool isinf BOOST_MATH_PREVENT_MACRO_SUBSTITUTION(T x) noexcept
{
if(BOOST_MATH_IS_CONSTANT_EVALUATED(x))
{
if constexpr (std::numeric_limits<T>::is_signed)
{
#if defined(__clang_major__) && __clang_major__ >= 6
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wtautological-constant-compare"
#endif
return x == std::numeric_limits<T>::infinity() || -x == std::numeric_limits<T>::infinity();
#if defined(__clang_major__) && __clang_major__ >= 6
#pragma clang diagnostic pop
#endif
}
else
{
return x == std::numeric_limits<T>::infinity();
}
}
else
{
using boost::math::isinf;
if constexpr (!std::is_integral_v<T>)
{
return (isinf)(x);
}
else
{
return (isinf)(static_cast<double>(x));
}
}
}
}
#endif // BOOST_MATH_CCMATH_ISINF