| /*============================================================================= |
| Copyright (c) 2001-2014 Joel de Guzman |
| Copyright (c) 2001-2011 Hartmut Kaiser |
| http://spirit.sourceforge.net/ |
| |
| Distributed under 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) |
| =============================================================================*/ |
| #if !defined(SPIRIT_SIGN_MAR_11_2009_0734PM) |
| #define SPIRIT_SIGN_MAR_11_2009_0734PM |
| |
| #if defined(_MSC_VER) |
| #pragma once |
| #endif |
| |
| #include <boost/config/no_tr1/cmath.hpp> |
| #include <boost/math/special_functions/fpclassify.hpp> |
| #include <boost/math/special_functions/sign.hpp> |
| |
| namespace boost { namespace spirit { namespace x3 |
| { |
| template<typename T> |
| inline bool (signbit)(T x) |
| { |
| return (boost::math::signbit)(x) ? true : false; |
| } |
| |
| // This routine has been taken and adapted from Johan Rade's fp_traits |
| // library |
| template<typename T> |
| inline T (changesign)(T x) |
| { |
| #if defined(BOOST_MATH_USE_STD_FPCLASSIFY) && !defined(BOOST_MATH_DISABLE_STD_FPCLASSIFY) |
| return -x; |
| #else |
| typedef typename math::detail::fp_traits<T>::type traits_type; |
| |
| typename traits_type::bits a; |
| traits_type::get_bits(x, a); |
| a ^= traits_type::sign; |
| traits_type::set_bits(x, a); |
| return x; |
| #endif |
| } |
| |
| }}} |
| |
| #endif |
