ceph/src/boost/boost/math/ccmath/trunc.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_TRUNC_HPP
   7 #define BOOST_MATH_CCMATH_TRUNC_HPP
   8
   9 #include <cmath>
  10 #include <type_traits>
  11 #include <boost/math/tools/is_constant_evaluated.hpp>
  12 #include <boost/math/ccmath/abs.hpp>
  13 #include <boost/math/ccmath/isinf.hpp>
  14 #include <boost/math/ccmath/isnan.hpp>
  15 #include <boost/math/ccmath/floor.hpp>
  16 #include <boost/math/ccmath/ceil.hpp>
  17
  18 namespace boost::math::ccmath {
  19
  20 namespace detail {
  21
  22 template <typename T>
  23 inline constexpr T trunc_impl(T arg) noexcept
  24 {
  25     return (arg > 0) ? boost::math::ccmath::floor(arg) : boost::math::ccmath::ceil(arg);
  26 }
  27
  28 } // Namespace detail
  29
  30 template <typename Real, std::enable_if_t<!std::is_integral_v<Real>, bool> = true>
  31 inline constexpr Real trunc(Real arg) noexcept
  32 {
  33     if(BOOST_MATH_IS_CONSTANT_EVALUATED(arg))
  34     {
  35         return boost::math::ccmath::abs(arg) == Real(0) ? arg :
  36                boost::math::ccmath::isinf(arg) ? arg :
  37                boost::math::ccmath::isnan(arg) ? arg :
  38                boost::math::ccmath::detail::trunc_impl(arg);
  39     }
  40     else
  41     {
  42         using std::trunc;
  43         return trunc(arg);
  44     }
  45 }
  46
  47 template <typename Z, std::enable_if_t<std::is_integral_v<Z>, bool> = true>
  48 inline constexpr double trunc(Z arg) noexcept
  49 {
  50     return boost::math::ccmath::trunc(static_cast<double>(arg));
  51 }
  52
  53 inline constexpr float truncf(float arg) noexcept
  54 {
  55     return boost::math::ccmath::trunc(arg);
  56 }
  57
  58 #ifndef BOOST_MATH_NO_LONG_DOUBLE_MATH_FUNCTIONS
  59 inline constexpr long double truncl(long double arg) noexcept
  60 {
  61     return boost::math::ccmath::trunc(arg);
  62 }
  63 #endif
  64
  65 } // Namespaces
  66
  67 #endif // BOOST_MATH_CCMATH_TRUNC_HPP