1/*=============================================================================
2 Copyright (c) 2001-2011 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=============================================================================*/
9#if !defined(SPIRIT_SIGN_MAR_11_2009_0734PM)
10#define SPIRIT_SIGN_MAR_11_2009_0734PM
11
12#if defined(_MSC_VER)
13#pragma once
14#endif
15
16#include <boost/config/no_tr1/cmath.hpp>
17#include <boost/version.hpp>
18#if BOOST_VERSION < 104000
19#include <boost/spirit/home/support/detail/math/fpclassify.hpp>
20#include <boost/spirit/home/support/detail/math/signbit.hpp>
21#else
22#include <boost/math/special_functions/fpclassify.hpp>
23#include <boost/math/special_functions/sign.hpp>
24#endif
25
26namespace boost { namespace spirit { namespace detail
27{
28#if BOOST_VERSION < 104000
29 // signbit(-NAN) is broken for versions of Boost earlier than 1.40.0
30 // This routine has been taken and adapted from Johan Rade's fp_traits
31 // library
32 template<typename T>
33 inline bool (signbit)(T x)
34 {
35 return (boost::spirit::math::signbit)(x);
36 }
37
38 template<typename T>
39 inline T (changesign)(T x)
40 {
41 return (boost::spirit::math::changesign)(x);
42 }
43#else
44 template<typename T>
45 inline bool (signbit)(T x)
46 {
47 return (boost::math::signbit)(x) ? true : false;
48 }
49
50 // This routine has been taken and adapted from Johan Rade's fp_traits
51 // library
52 template<typename T>
53 inline T (changesign)(T x)
54 {
55#if defined(BOOST_MATH_USE_STD_FPCLASSIFY) && !defined(BOOST_MATH_DISABLE_STD_FPCLASSIFY)
56 return -x;
57#else
58 typedef typename math::detail::fp_traits<T>::type traits_type;
59
60 typename traits_type::bits a;
61 traits_type::get_bits(x, a);
62 a ^= traits_type::sign;
63 traits_type::set_bits(x, a);
64 return x;
65#endif
66 }
67#endif
68
69}}}
70
71#endif
72

source code of qtlocation/src/3rdparty/mapbox-gl-native/deps/boost/1.65.1/include/boost/spirit/home/support/detail/sign.hpp