1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
|
// (c) Copyright Fernando Luis Cacciola Carballal 2000-2004
// Use, modification, and distribution is subject to 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)
// See library home page at http://www.boost.org/libs/numeric/conversion
//
// Contact the author at: fernando_cacciola@hotmail.com
//
#ifndef BOOST_NUMERIC_CONVERSION_CONVERTER_POLICIES_FLC_12NOV2002_HPP
#define BOOST_NUMERIC_CONVERSION_CONVERTER_POLICIES_FLC_12NOV2002_HPP
#include <typeinfo> // for std::bad_cast
#include <boost/config/no_tr1/cmath.hpp> // for std::floor and std::ceil
#include <boost/throw_exception.hpp>
#include <functional>
#include "boost/type_traits/is_arithmetic.hpp"
#include "boost/mpl/if.hpp"
#include "boost/mpl/integral_c.hpp"
namespace boost { namespace numeric
{
template<class S>
struct Trunc
{
typedef S source_type ;
typedef typename mpl::if_< is_arithmetic<S>,S,S const&>::type argument_type ;
static source_type nearbyint ( argument_type s )
{
#if !defined(BOOST_NO_STDC_NAMESPACE)
using std::floor ;
using std::ceil ;
#endif
return s < static_cast<S>(0) ? ceil(s) : floor(s) ;
}
typedef mpl::integral_c< std::float_round_style, std::round_toward_zero> round_style ;
} ;
template<class S>
struct Floor
{
typedef S source_type ;
typedef typename mpl::if_< is_arithmetic<S>,S,S const&>::type argument_type ;
static source_type nearbyint ( argument_type s )
{
#if !defined(BOOST_NO_STDC_NAMESPACE)
using std::floor ;
#endif
return floor(s) ;
}
typedef mpl::integral_c< std::float_round_style, std::round_toward_neg_infinity> round_style ;
} ;
template<class S>
struct Ceil
{
typedef S source_type ;
typedef typename mpl::if_< is_arithmetic<S>,S,S const&>::type argument_type ;
static source_type nearbyint ( argument_type s )
{
#if !defined(BOOST_NO_STDC_NAMESPACE)
using std::ceil ;
#endif
return ceil(s) ;
}
typedef mpl::integral_c< std::float_round_style, std::round_toward_infinity> round_style ;
} ;
template<class S>
struct RoundEven
{
typedef S source_type ;
typedef typename mpl::if_< is_arithmetic<S>,S,S const&>::type argument_type ;
static source_type nearbyint ( argument_type s )
{
// Algorithm contributed by Guillaume Melquiond
#if !defined(BOOST_NO_STDC_NAMESPACE)
using std::floor ;
using std::ceil ;
#endif
// only works inside the range not at the boundaries
S prev = floor(s);
S next = ceil(s);
S rt = (s - prev) - (next - s); // remainder type
S const zero(0.0);
S const two(2.0);
if ( rt < zero )
return prev;
else if ( rt > zero )
return next;
else
{
bool is_prev_even = two * floor(prev / two) == prev ;
return ( is_prev_even ? prev : next ) ;
}
}
typedef mpl::integral_c< std::float_round_style, std::round_to_nearest> round_style ;
} ;
enum range_check_result
{
cInRange = 0 ,
cNegOverflow = 1 ,
cPosOverflow = 2
} ;
class bad_numeric_cast : public std::bad_cast
{
public:
virtual const char * what() const throw()
{ return "bad numeric conversion: overflow"; }
};
class negative_overflow : public bad_numeric_cast
{
public:
virtual const char * what() const throw()
{ return "bad numeric conversion: negative overflow"; }
};
class positive_overflow : public bad_numeric_cast
{
public:
virtual const char * what() const throw()
{ return "bad numeric conversion: positive overflow"; }
};
struct def_overflow_handler
{
void operator() ( range_check_result r ) // throw(negative_overflow,positive_overflow)
{
#ifndef BOOST_NO_EXCEPTIONS
if ( r == cNegOverflow )
throw negative_overflow() ;
else if ( r == cPosOverflow )
throw positive_overflow() ;
#else
if ( r == cNegOverflow )
::boost::throw_exception(negative_overflow()) ;
else if ( r == cPosOverflow )
::boost::throw_exception(positive_overflow()) ;
#endif
}
} ;
struct silent_overflow_handler
{
void operator() ( range_check_result ) {} // throw()
} ;
template<class Traits>
struct raw_converter
{
typedef typename Traits::result_type result_type ;
typedef typename Traits::argument_type argument_type ;
static result_type low_level_convert ( argument_type s ) { return static_cast<result_type>(s) ; }
} ;
struct UseInternalRangeChecker {} ;
} } // namespace boost::numeric
#endif
|
Swift