| 1 | // (C) Copyright Matt Borland 2021. |
|---|
| 2 | // Use, modification and distribution are subject to the |
|---|
| 3 | // Boost Software License, Version 1.0. (See accompanying file |
|---|
| 4 | // LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
|---|
| 5 | |
|---|
| 6 | #ifndef BOOST_MATH_CCMATH_ISNAN |
|---|
| 7 | #define BOOST_MATH_CCMATH_ISNAN |
|---|
| 8 | |
|---|
| 9 | #include <boost/math/special_functions/fpclassify.hpp> |
|---|
| 10 | #include <boost/math/ccmath/detail/config.hpp> |
|---|
| 11 | |
|---|
| 12 | #ifdef BOOST_MATH_NO_CCMATH |
|---|
| 13 | #error "The header <boost/math/isnan.hpp> can only be used in C++17 and later." |
|---|
| 14 | #endif |
|---|
| 15 | |
|---|
| 16 | namespace boost::math::ccmath { |
|---|
| 17 | |
|---|
| 18 | template <typename T> |
|---|
| 19 | inline constexpr bool isnan BOOST_MATH_PREVENT_MACRO_SUBSTITUTION(T x) |
|---|
| 20 | { |
|---|
| 21 | if(BOOST_MATH_IS_CONSTANT_EVALUATED(x)) |
|---|
| 22 | { |
|---|
| 23 | return x != x; |
|---|
| 24 | } |
|---|
| 25 | else |
|---|
| 26 | { |
|---|
| 27 | using boost::math::isnan; |
|---|
| 28 | |
|---|
| 29 | if constexpr (!std::is_integral_v<T>) |
|---|
| 30 | { |
|---|
| 31 | return (isnan)(x); |
|---|
| 32 | } |
|---|
| 33 | else |
|---|
| 34 | { |
|---|
| 35 | return (isnan)(static_cast<double>(x)); |
|---|
| 36 | } |
|---|
| 37 | } |
|---|
| 38 | } |
|---|
| 39 | |
|---|
| 40 | } |
|---|
| 41 | |
|---|
| 42 | #endif // BOOST_MATH_CCMATH_ISNAN |
|---|
| 43 | |
|---|
