/*============================================================================= | |
Copyright (c) 2001-2011 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/version.hpp> | |
#if BOOST_VERSION < 104000 | |
#include <boost/spirit/home/support/detail/math/fpclassify.hpp> | |
#include <boost/spirit/home/support/detail/math/signbit.hpp> | |
#else | |
#include <boost/math/special_functions/fpclassify.hpp> | |
#include <boost/math/special_functions/sign.hpp> | |
#endif | |
namespace boost { namespace spirit { namespace detail | |
{ | |
#if BOOST_VERSION < 104000 | |
// signbit(-NAN) is broken for versions of Boost earlier than 1.40.0 | |
// This routine has been taken and adapted from Johan Rade's fp_traits | |
// library | |
template<typename T> | |
inline bool (signbit)(T x) | |
{ | |
return (boost::spirit::math::signbit)(x); | |
} | |
template<typename T> | |
inline T (changesign)(T x) | |
{ | |
return (boost::spirit::math::changesign)(x); | |
} | |
#else | |
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 | |
}}} | |
#endif |