ceph/src/boost/boost/math/ccmath/isinf.hpp

   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_ISINF
   7 #define BOOST_MATH_CCMATH_ISINF
   8
   9 #include <cmath>
  10 #include <limits>
  11 #include <type_traits>
  12 #include <boost/math/tools/is_constant_evaluated.hpp>
  13
  14 namespace boost::math::ccmath {
  15
  16 template <typename T>
  17 inline constexpr bool isinf(T x)
  18 {
  19     if(BOOST_MATH_IS_CONSTANT_EVALUATED(x))
  20     {
  21         return x == std::numeric_limits<T>::infinity() || -x == std::numeric_limits<T>::infinity();
  22     }
  23     else
  24     {
  25         using std::isinf;
  26
  27         if constexpr (!std::is_integral_v<T>)
  28         {
  29             return isinf(x);
  30         }
  31         else
  32         {
  33             return isinf(static_cast<double>(x));
  34         }
  35     }
  36 }
  37
  38 }
  39
  40 #endif // BOOST_MATH_CCMATH_ISINF