ceph/src/boost/boost/math/cstdfloat/cstdfloat_limits.hpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Copyright Christopher Kormanyos 2014.
   3 // Copyright John Maddock 2014.
   4 // Copyright Paul Bristow 2014.
   5 // Distributed under the Boost Software License,
   6 // Version 1.0. (See accompanying file LICENSE_1_0.txt
   7 // or copy at http://www.boost.org/LICENSE_1_0.txt)
   8 //
   9
  10 // Implement quadruple-precision std::numeric_limits<> support.
  11
  12 #ifndef BOOST_MATH_CSTDFLOAT_LIMITS_2014_01_09_HPP_
  13   #define BOOST_MATH_CSTDFLOAT_LIMITS_2014_01_09_HPP_
  14
  15   #include <boost/math/cstdfloat/cstdfloat_types.hpp>
  16
  17 #if defined(__GNUC__) && defined(BOOST_MATH_USE_FLOAT128)
  18 //
  19 // This is the only way we can avoid
  20 // warning: non-standard suffix on floating constant [-Wpedantic]
  21 // when building with -Wall -pedantic.  Neither __extension__
  22 // nor #pragma diagnostic ignored work :(
  23 //
  24 #pragma GCC system_header
  25 #endif
  26
  27   #if defined(BOOST_CSTDFLOAT_HAS_INTERNAL_FLOAT128_T) && defined(BOOST_MATH_USE_FLOAT128) && !defined(BOOST_CSTDFLOAT_NO_LIBQUADMATH_SUPPORT)
  28
  29     #include <limits>
  30
  31     // Define the name of the global quadruple-precision function to be used for
  32     // calculating quiet_NaN() in the specialization of std::numeric_limits<>.
  33     #if defined(__INTEL_COMPILER)
  34       #define BOOST_CSTDFLOAT_FLOAT128_SQRT   __sqrtq
  35     #elif defined(__GNUC__)
  36       #define BOOST_CSTDFLOAT_FLOAT128_SQRT   sqrtq
  37     #endif
  38
  39     // Forward declaration of the quadruple-precision square root function.
  40     extern "C" boost::math::cstdfloat::detail::float_internal128_t BOOST_CSTDFLOAT_FLOAT128_SQRT(boost::math::cstdfloat::detail::float_internal128_t) throw();
  41
  42     namespace std
  43     {
  44       template<>
  45       class numeric_limits<boost::math::cstdfloat::detail::float_internal128_t>
  46       {
  47       public:
  48         static constexpr bool                                                 is_specialized           = true;
  49         static                 boost::math::cstdfloat::detail::float_internal128_t  (min) () noexcept  { return BOOST_CSTDFLOAT_FLOAT128_MIN; }
  50         static                 boost::math::cstdfloat::detail::float_internal128_t  (max) () noexcept  { return BOOST_CSTDFLOAT_FLOAT128_MAX; }
  51         static                 boost::math::cstdfloat::detail::float_internal128_t  lowest() noexcept  { return -(max)(); }
  52         static constexpr int                                                  digits                   = 113;
  53         static constexpr int                                                  digits10                 = 33;
  54         static constexpr int                                                  max_digits10             = 36;
  55         static constexpr bool                                                 is_signed                = true;
  56         static constexpr bool                                                 is_integer               = false;
  57         static constexpr bool                                                 is_exact                 = false;
  58         static constexpr int                                                  radix                    = 2;
  59         static                 boost::math::cstdfloat::detail::float_internal128_t  epsilon    ()            { return BOOST_CSTDFLOAT_FLOAT128_EPS; }
  60         static                 boost::math::cstdfloat::detail::float_internal128_t  round_error()            { return BOOST_FLOAT128_C(0.5); }
  61         static constexpr int                                                  min_exponent             = -16381;
  62         static constexpr int                                                  min_exponent10           = static_cast<int>((min_exponent * 301L) / 1000L);
  63         static constexpr int                                                  max_exponent             = +16384;
  64         static constexpr int                                                  max_exponent10           = static_cast<int>((max_exponent * 301L) / 1000L);
  65         static constexpr bool                                                 has_infinity             = true;
  66         static constexpr bool                                                 has_quiet_NaN            = true;
  67         static constexpr bool                                                 has_signaling_NaN        = false;
  68         static constexpr float_denorm_style                                   has_denorm               = denorm_present;
  69         static constexpr bool                                                 has_denorm_loss          = false;
  70         static                 boost::math::cstdfloat::detail::float_internal128_t  infinity     ()          { return BOOST_FLOAT128_C(1.0) / BOOST_FLOAT128_C(0.0); }
  71         static                 boost::math::cstdfloat::detail::float_internal128_t  quiet_NaN    ()          { return -(::BOOST_CSTDFLOAT_FLOAT128_SQRT(BOOST_FLOAT128_C(-1.0))); }
  72         static                 boost::math::cstdfloat::detail::float_internal128_t  signaling_NaN()          { return BOOST_FLOAT128_C(0.0); }
  73         static                 boost::math::cstdfloat::detail::float_internal128_t  denorm_min   ()          { return BOOST_CSTDFLOAT_FLOAT128_DENORM_MIN; }
  74         static constexpr bool                                                 is_iec559                = true;
  75         static constexpr bool                                                 is_bounded               = true;
  76         static constexpr bool                                                 is_modulo                = false;
  77         static constexpr bool                                                 traps                    = false;
  78         static constexpr bool                                                 tinyness_before          = false;
  79         static constexpr float_round_style                                    round_style              = round_to_nearest;
  80       };
  81     } // namespace std
  82
  83   #endif // Not BOOST_CSTDFLOAT_NO_LIBQUADMATH_SUPPORT (i.e., the user would like to have libquadmath support)
  84
  85 #endif // BOOST_MATH_CSTDFLOAT_LIMITS_2014_01_09_HPP_
  86