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7c673cae FG |
1 | /*============================================================================= |
2 | Copyright (c) 2001-2014 Joel de Guzman | |
3 | Copyright (c) 2001-2011 Hartmut Kaiser | |
4 | http://spirit.sourceforge.net/ | |
5 | ||
6 | Distributed under the Boost Software License, Version 1.0. (See accompanying | |
7 | file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | |
8 | =============================================================================*/ | |
11fdf7f2 TL |
9 | #if !defined(BOOST_SPIRIT_X3_SIGN_MAR_11_2009_0734PM) |
10 | #define BOOST_SPIRIT_X3_SIGN_MAR_11_2009_0734PM | |
7c673cae FG |
11 | |
12 | #include <boost/config/no_tr1/cmath.hpp> | |
13 | #include <boost/math/special_functions/fpclassify.hpp> | |
14 | #include <boost/math/special_functions/sign.hpp> | |
15 | ||
16 | namespace boost { namespace spirit { namespace x3 | |
17 | { | |
18 | template<typename T> | |
19 | inline bool (signbit)(T x) | |
20 | { | |
21 | return (boost::math::signbit)(x) ? true : false; | |
22 | } | |
23 | ||
24 | // This routine has been taken and adapted from Johan Rade's fp_traits | |
25 | // library | |
26 | template<typename T> | |
27 | inline T (changesign)(T x) | |
28 | { | |
29 | #if defined(BOOST_MATH_USE_STD_FPCLASSIFY) && !defined(BOOST_MATH_DISABLE_STD_FPCLASSIFY) | |
30 | return -x; | |
31 | #else | |
32 | typedef typename math::detail::fp_traits<T>::type traits_type; | |
33 | ||
34 | typename traits_type::bits a; | |
35 | traits_type::get_bits(x, a); | |
36 | a ^= traits_type::sign; | |
37 | traits_type::set_bits(x, a); | |
38 | return x; | |
39 | #endif | |
40 | } | |
41 | ||
42 | }}} | |
43 | ||
44 | #endif |