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
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
|
/*
* Copyright Andrey Semashev 2007 - 2015.
* 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)
*/
/*!
* \file logical.hpp
* \author Andrey Semashev
* \date 30.03.2008
*
* This header contains logical predicates for value comparison, analogous to \c std::less, \c std::greater
* and others. The main difference from the standard equivalents is that the predicates defined in this
* header are not templates and therefore do not require a fixed argument type. Furthermore, both arguments
* may have different types, in which case the comparison is performed without type conversion.
*
* \note In case if arguments are integral, the conversion is performed according to the standard C++ rules
* in order to avoid warnings from the compiler.
*/
#ifndef BOOST_LOG_UTILITY_FUNCTIONAL_LOGICAL_HPP_INCLUDED_
#define BOOST_LOG_UTILITY_FUNCTIONAL_LOGICAL_HPP_INCLUDED_
#include <boost/mpl/if.hpp>
#include <boost/mpl/bool.hpp>
#include <boost/mpl/and.hpp>
#include <boost/type_traits/is_integral.hpp>
#include <boost/type_traits/is_unsigned.hpp>
#include <boost/log/detail/config.hpp>
#include <boost/log/detail/header.hpp>
#ifdef BOOST_HAS_PRAGMA_ONCE
#pragma once
#endif
namespace boost {
BOOST_LOG_OPEN_NAMESPACE
namespace aux {
//! The trait creates a common integral type suitable for comparison. This is mostly to silence compiler warnings like 'signed/unsigned mismatch'.
template< typename T, typename U, unsigned int TSizeV = sizeof(T), unsigned int USizeV = sizeof(U), bool TSmallerThanU = (sizeof(T) < sizeof(U)) >
struct make_common_integral_type
{
typedef T type;
};
//! Specialization for case when \c T is smaller than \c U
template< typename T, typename U, unsigned int TSizeV, unsigned int USizeV >
struct make_common_integral_type< T, U, TSizeV, USizeV, true >
{
typedef U type;
};
//! Specialization for the case when both types have the same size
template< typename T, typename U, unsigned int SizeV >
struct make_common_integral_type< T, U, SizeV, SizeV, false > :
public mpl::if_<
is_unsigned< T >,
T,
U
>
{
};
} // namespace aux
//! Equality predicate
struct equal_to
{
typedef bool result_type;
template< typename T, typename U >
bool operator() (T const& left, U const& right) const
{
return op(left, right, typename mpl::and_< is_integral< T >, is_integral< U > >::type());
}
private:
template< typename T, typename U >
static bool op(T const& left, U const& right, mpl::false_ const&)
{
return (left == right);
}
template< typename T, typename U >
static bool op(T const& left, U const& right, mpl::true_ const&)
{
typedef typename aux::make_common_integral_type< T, U >::type common_integral_type;
return static_cast< common_integral_type >(left) == static_cast< common_integral_type >(right);
}
};
//! Inequality predicate
struct not_equal_to
{
typedef bool result_type;
template< typename T, typename U >
bool operator() (T const& left, U const& right) const
{
return op(left, right, typename mpl::and_< is_integral< T >, is_integral< U > >::type());
}
private:
template< typename T, typename U >
static bool op(T const& left, U const& right, mpl::false_ const&)
{
return (left != right);
}
template< typename T, typename U >
static bool op(T const& left, U const& right, mpl::true_ const&)
{
typedef typename aux::make_common_integral_type< T, U >::type common_integral_type;
return static_cast< common_integral_type >(left) != static_cast< common_integral_type >(right);
}
};
//! Less predicate
struct less
{
typedef bool result_type;
template< typename T, typename U >
bool operator() (T const& left, U const& right) const
{
return op(left, right, typename mpl::and_< is_integral< T >, is_integral< U > >::type());
}
private:
template< typename T, typename U >
static bool op(T const& left, U const& right, mpl::false_ const&)
{
return (left < right);
}
template< typename T, typename U >
static bool op(T const& left, U const& right, mpl::true_ const&)
{
typedef typename aux::make_common_integral_type< T, U >::type common_integral_type;
return static_cast< common_integral_type >(left) < static_cast< common_integral_type >(right);
}
};
//! Greater predicate
struct greater
{
typedef bool result_type;
template< typename T, typename U >
bool operator() (T const& left, U const& right) const
{
return op(left, right, typename mpl::and_< is_integral< T >, is_integral< U > >::type());
}
private:
template< typename T, typename U >
static bool op(T const& left, U const& right, mpl::false_ const&)
{
return (left > right);
}
template< typename T, typename U >
static bool op(T const& left, U const& right, mpl::true_ const&)
{
typedef typename aux::make_common_integral_type< T, U >::type common_integral_type;
return static_cast< common_integral_type >(left) > static_cast< common_integral_type >(right);
}
};
//! Less or equal predicate
struct less_equal
{
typedef bool result_type;
template< typename T, typename U >
bool operator() (T const& left, U const& right) const
{
return op(left, right, typename mpl::and_< is_integral< T >, is_integral< U > >::type());
}
private:
template< typename T, typename U >
static bool op(T const& left, U const& right, mpl::false_ const&)
{
return (left <= right);
}
template< typename T, typename U >
static bool op(T const& left, U const& right, mpl::true_ const&)
{
typedef typename aux::make_common_integral_type< T, U >::type common_integral_type;
return static_cast< common_integral_type >(left) <= static_cast< common_integral_type >(right);
}
};
//! Greater or equal predicate
struct greater_equal
{
typedef bool result_type;
template< typename T, typename U >
bool operator() (T const& left, U const& right) const
{
return op(left, right, typename mpl::and_< is_integral< T >, is_integral< U > >::type());
}
private:
template< typename T, typename U >
static bool op(T const& left, U const& right, mpl::false_ const&)
{
return (left >= right);
}
template< typename T, typename U >
static bool op(T const& left, U const& right, mpl::true_ const&)
{
typedef typename aux::make_common_integral_type< T, U >::type common_integral_type;
return static_cast< common_integral_type >(left) >= static_cast< common_integral_type >(right);
}
};
BOOST_LOG_CLOSE_NAMESPACE // namespace log
} // namespace boost
#include <boost/log/detail/footer.hpp>
#endif // BOOST_LOG_UTILITY_FUNCTIONAL_LOGICAL_HPP_INCLUDED_
|
