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1 | // Copyright John Maddock 2007. |
2 | // Use, modification and distribution are subject to the | |
3 | // Boost Software License, Version 1.0. (See accompanying file | |
4 | // LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | |
5 | ||
6 | #ifndef BOOST_MATH_TRUNC_HPP | |
7 | #define BOOST_MATH_TRUNC_HPP | |
8 | ||
9 | #ifdef _MSC_VER | |
10 | #pragma once | |
11 | #endif | |
12 | ||
13 | #include <boost/math/special_functions/math_fwd.hpp> | |
14 | #include <boost/math/tools/config.hpp> | |
15 | #include <boost/math/policies/error_handling.hpp> | |
16 | #include <boost/math/special_functions/fpclassify.hpp> | |
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17 | #include <boost/type_traits/is_constructible.hpp> |
18 | #include <boost/core/enable_if.hpp> | |
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19 | |
20 | namespace boost{ namespace math{ namespace detail{ | |
21 | ||
22 | template <class T, class Policy> | |
23 | inline typename tools::promote_args<T>::type trunc(const T& v, const Policy& pol, const mpl::false_&) | |
24 | { | |
25 | BOOST_MATH_STD_USING | |
26 | typedef typename tools::promote_args<T>::type result_type; | |
27 | if(!(boost::math::isfinite)(v)) | |
28 | return policies::raise_rounding_error("boost::math::trunc<%1%>(%1%)", 0, static_cast<result_type>(v), static_cast<result_type>(v), pol); | |
29 | return (v >= 0) ? static_cast<result_type>(floor(v)) : static_cast<result_type>(ceil(v)); | |
30 | } | |
31 | ||
32 | template <class T, class Policy> | |
33 | inline typename tools::promote_args<T>::type trunc(const T& v, const Policy&, const mpl::true_&) | |
34 | { | |
35 | return v; | |
36 | } | |
37 | ||
38 | } | |
39 | ||
40 | template <class T, class Policy> | |
41 | inline typename tools::promote_args<T>::type trunc(const T& v, const Policy& pol) | |
42 | { | |
43 | return detail::trunc(v, pol, mpl::bool_<detail::is_integer_for_rounding<T>::value>()); | |
44 | } | |
45 | template <class T> | |
46 | inline typename tools::promote_args<T>::type trunc(const T& v) | |
47 | { | |
48 | return trunc(v, policies::policy<>()); | |
49 | } | |
50 | // | |
51 | // The following functions will not compile unless T has an | |
52 | // implicit convertion to the integer types. For user-defined | |
53 | // number types this will likely not be the case. In that case | |
54 | // these functions should either be specialized for the UDT in | |
92f5a8d4 | 55 | // question, or else overloads should be placed in the same |
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56 | // namespace as the UDT: these will then be found via argument |
57 | // dependent lookup. See our concept archetypes for examples. | |
58 | // | |
59 | template <class T, class Policy> | |
60 | inline int itrunc(const T& v, const Policy& pol) | |
61 | { | |
62 | BOOST_MATH_STD_USING | |
63 | typedef typename tools::promote_args<T>::type result_type; | |
64 | result_type r = boost::math::trunc(v, pol); | |
65 | if((r > (std::numeric_limits<int>::max)()) || (r < (std::numeric_limits<int>::min)())) | |
66 | return static_cast<int>(policies::raise_rounding_error("boost::math::itrunc<%1%>(%1%)", 0, static_cast<result_type>(v), 0, pol)); | |
67 | return static_cast<int>(r); | |
68 | } | |
69 | template <class T> | |
70 | inline int itrunc(const T& v) | |
71 | { | |
72 | return itrunc(v, policies::policy<>()); | |
73 | } | |
74 | ||
75 | template <class T, class Policy> | |
76 | inline long ltrunc(const T& v, const Policy& pol) | |
77 | { | |
78 | BOOST_MATH_STD_USING | |
79 | typedef typename tools::promote_args<T>::type result_type; | |
80 | result_type r = boost::math::trunc(v, pol); | |
81 | if((r > (std::numeric_limits<long>::max)()) || (r < (std::numeric_limits<long>::min)())) | |
82 | return static_cast<long>(policies::raise_rounding_error("boost::math::ltrunc<%1%>(%1%)", 0, static_cast<result_type>(v), 0L, pol)); | |
83 | return static_cast<long>(r); | |
84 | } | |
85 | template <class T> | |
86 | inline long ltrunc(const T& v) | |
87 | { | |
88 | return ltrunc(v, policies::policy<>()); | |
89 | } | |
90 | ||
91 | #ifdef BOOST_HAS_LONG_LONG | |
92 | ||
93 | template <class T, class Policy> | |
94 | inline boost::long_long_type lltrunc(const T& v, const Policy& pol) | |
95 | { | |
96 | BOOST_MATH_STD_USING | |
97 | typedef typename tools::promote_args<T>::type result_type; | |
98 | result_type r = boost::math::trunc(v, pol); | |
99 | if((r > (std::numeric_limits<boost::long_long_type>::max)()) || (r < (std::numeric_limits<boost::long_long_type>::min)())) | |
100 | return static_cast<boost::long_long_type>(policies::raise_rounding_error("boost::math::lltrunc<%1%>(%1%)", 0, v, static_cast<boost::long_long_type>(0), pol)); | |
101 | return static_cast<boost::long_long_type>(r); | |
102 | } | |
103 | template <class T> | |
104 | inline boost::long_long_type lltrunc(const T& v) | |
105 | { | |
106 | return lltrunc(v, policies::policy<>()); | |
107 | } | |
108 | ||
109 | #endif | |
110 | ||
92f5a8d4 TL |
111 | template <class T, class Policy> |
112 | inline typename boost::enable_if_c<boost::is_constructible<int, T>::value, int>::type | |
113 | iconvert(const T& v, const Policy&) | |
114 | { | |
115 | return static_cast<int>(v); | |
116 | } | |
117 | ||
118 | template <class T, class Policy> | |
119 | inline typename boost::disable_if_c<boost::is_constructible<int, T>::value, int>::type | |
120 | iconvert(const T& v, const Policy& pol) | |
121 | { | |
122 | using boost::math::itrunc; | |
123 | return itrunc(v, pol); | |
124 | } | |
125 | ||
126 | template <class T, class Policy> | |
127 | inline typename boost::enable_if_c<boost::is_constructible<long, T>::value, long>::type | |
128 | lconvert(const T& v, const Policy&) | |
129 | { | |
130 | return static_cast<long>(v); | |
131 | } | |
132 | ||
133 | template <class T, class Policy> | |
134 | inline typename boost::disable_if_c<boost::is_constructible<long, T>::value, long>::type | |
135 | lconvert(const T& v, const Policy& pol) | |
136 | { | |
137 | using boost::math::ltrunc; | |
138 | return ltrunc(v, pol); | |
139 | } | |
140 | ||
141 | #ifdef BOOST_HAS_LONG_LONG | |
142 | ||
143 | template <class T, class Policy> | |
144 | inline typename boost::enable_if_c<boost::is_constructible<boost::long_long_type, T>::value, boost::long_long_type>::type | |
145 | llconvertert(const T& v, const Policy&) | |
146 | { | |
147 | return static_cast<boost::long_long_type>(v); | |
148 | } | |
149 | ||
150 | template <class T, class Policy> | |
151 | inline typename boost::disable_if_c<boost::is_constructible<boost::long_long_type, T>::value, boost::long_long_type>::type | |
152 | llconvertert(const T& v, const Policy& pol) | |
153 | { | |
154 | using boost::math::lltrunc; | |
155 | return lltrunc(v, pol); | |
156 | } | |
157 | ||
158 | #endif | |
159 | ||
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160 | }} // namespaces |
161 | ||
162 | #endif // BOOST_MATH_TRUNC_HPP |