-
-
Notifications
You must be signed in to change notification settings - Fork 585
/
conversion_impl.hpp
353 lines (306 loc) · 11.2 KB
/
conversion_impl.hpp
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
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
/*********************************************************************
* Software License Agreement (BSD License)
*
* Copyright 2016-2017 Davide Faconti
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
* * Neither the name of Willow Garage, Inc. nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
* *******************************************************************/
#ifndef VARIANT_IMPL_H
#define VARIANT_IMPL_H
#include <type_traits>
#include <limits>
#include <iostream>
#include <cmath>
#include "rosx_introspection/builtin_types.hpp"
#include "rosx_introspection/details/exceptions.hpp"
namespace RosMsgParser
{
namespace details
{
template <typename T>
using Invoke = typename T::type;
template <typename BoolCondition>
using EnableIf = Invoke<std::enable_if<BoolCondition::value>>;
template <typename T>
struct is_integer : std::integral_constant<bool, std::is_integral<T>::value &&
!std::is_same<T, bool>::value &&
!std::is_same<T, char>::value>
{
};
template <typename From, typename To>
struct is_same_real : std::integral_constant<bool, std::is_same<From, To>::value &&
std::is_floating_point<To>::value>
{
};
template <typename From, typename To>
struct is_safe_integer_conversion
: std::integral_constant<bool,
is_integer<From>::value && is_integer<To>::value &&
sizeof(From) <= sizeof(To) &&
std::is_signed<From>::value == std::is_signed<To>::value>
{
};
template <typename From, typename To>
struct float_conversion
: std::integral_constant<bool, std::is_floating_point<From>::value &&
std::is_floating_point<To>::value &&
!std::is_same<From, To>::value>
{
};
template <typename From, typename To>
struct unsigned_to_smaller_conversion
: std::integral_constant<bool, is_integer<From>::value && is_integer<To>::value &&
(sizeof(From) > sizeof(To)) &&
!std::is_signed<From>::value &&
!std::is_signed<To>::value>
{
};
template <typename From, typename To>
struct signed_to_smaller_conversion
: std::integral_constant<bool, is_integer<From>::value && is_integer<To>::value &&
(sizeof(From) > sizeof(To)) &&
std::is_signed<From>::value &&
std::is_signed<To>::value>
{
};
//---------------------------
template <typename From, typename To>
struct signed_to_smaller_unsigned_conversion
: std::integral_constant<bool, is_integer<From>::value && is_integer<To>::value &&
sizeof(From) >= sizeof(To) &&
std::is_signed<From>::value &&
!std::is_signed<To>::value>
{
};
template <typename From, typename To>
struct signed_to_larger_unsigned_conversion
: std::integral_constant<bool, is_integer<From>::value && is_integer<To>::value &&
sizeof(From) < sizeof(To) &&
std::is_signed<From>::value &&
!std::is_signed<To>::value>
{
};
template <typename From, typename To>
struct unsigned_to_smaller_signed_conversion
: std::integral_constant<bool, is_integer<From>::value && is_integer<To>::value &&
(sizeof(From) >= sizeof(To)) &&
!std::is_signed<From>::value &&
std::is_signed<To>::value>
{
};
template <typename From, typename To>
struct unsigned_to_larger_signed_conversion
: std::integral_constant<bool, is_integer<From>::value && is_integer<To>::value &&
sizeof(From) < sizeof(To) &&
!std::is_signed<From>::value &&
std::is_signed<To>::value>
{
};
template <typename From, typename To>
struct floating_to_signed_conversion
: std::integral_constant<bool, std::is_floating_point<From>::value &&
is_integer<To>::value && std::is_signed<To>::value>
{
};
template <typename From, typename To>
struct floating_to_unsigned_conversion
: std::integral_constant<bool, std::is_floating_point<From>::value &&
is_integer<To>::value && !std::is_signed<To>::value>
{
};
template <typename From, typename To>
struct integer_to_floating_conversion
: std::integral_constant<bool,
is_integer<From>::value && std::is_floating_point<To>::value>
{
};
template <typename From, typename To>
inline void checkUpperLimit(const From& from)
{
if ((sizeof(To) < sizeof(From)) &&
(from > static_cast<From>(std::numeric_limits<To>::max())))
{
throw RangeException("Value too large.");
}
else if (static_cast<To>(from) > std::numeric_limits<To>::max())
{
throw RangeException("Value too large.");
}
}
template <typename From, typename To>
inline void checkUpperLimitFloat(const From& from)
{
if (from > std::numeric_limits<To>::max())
{
throw RangeException("Value too large.");
}
}
template <typename From, typename To>
inline void checkLowerLimitFloat(const From& from)
{
if (from < -std::numeric_limits<To>::max())
{
throw RangeException("Value too small.");
}
}
template <typename From, typename To>
inline void checkLowerLimit(const From& from)
{
if (from < std::numeric_limits<To>::min())
{
throw RangeException("Value too small.");
}
}
template <typename From, typename To>
inline void checkTruncation(const From& from)
{
if (from != static_cast<From>(static_cast<To>(from)))
{
throw RangeException("Floating point truncated");
}
}
//----------------------- Implementation ----------------------------------------------
template <typename SRC, typename DST,
typename details::EnableIf<details::is_same_real<SRC, DST>>* = nullptr>
inline void convert_impl(const SRC& from, DST& target)
{
target = from;
}
template <
typename SRC, typename DST,
typename details::EnableIf<details::is_safe_integer_conversion<SRC, DST>>* = nullptr>
inline void convert_impl(const SRC& from, DST& target)
{
target = static_cast<DST>(from);
}
template <typename SRC, typename DST,
typename details::EnableIf<details::float_conversion<SRC, DST>>* = nullptr>
inline void convert_impl(const SRC& from, DST& target)
{
if (!std::isnan(from))
{
checkTruncation<SRC, DST>(from);
}
target = static_cast<DST>(from);
}
template <typename SRC, typename DST,
typename details::EnableIf<details::unsigned_to_smaller_conversion<SRC, DST>>* =
nullptr>
inline void convert_impl(const SRC& from, DST& target)
{
checkUpperLimit<SRC, DST>(from);
target = static_cast<DST>(from);
}
template <typename SRC, typename DST,
typename details::EnableIf<details::signed_to_smaller_conversion<SRC, DST>>* =
nullptr>
inline void convert_impl(const SRC& from, DST& target)
{
checkLowerLimit<SRC, DST>(from);
checkUpperLimit<SRC, DST>(from);
target = static_cast<DST>(from);
}
template <typename SRC, typename DST,
typename details::EnableIf<
details::signed_to_smaller_unsigned_conversion<SRC, DST>>* = nullptr>
inline void convert_impl(const SRC& from, DST& target)
{
if (from < 0)
{
throw RangeException("Value is negative and can't be converted to signed");
}
checkUpperLimit<SRC, DST>(from);
target = static_cast<DST>(from);
}
template <typename SRC, typename DST,
typename details::EnableIf<
details::signed_to_larger_unsigned_conversion<SRC, DST>>* = nullptr>
inline void convert_impl(const SRC& from, DST& target)
{
if (from < 0)
{
throw RangeException("Value is negative and can't be converted to signed");
}
target = static_cast<DST>(from);
}
template <typename SRC, typename DST,
typename details::EnableIf<
details::unsigned_to_larger_signed_conversion<SRC, DST>>* = nullptr>
inline void convert_impl(const SRC& from, DST& target)
{
target = static_cast<DST>(from);
}
template <typename SRC, typename DST,
typename details::EnableIf<
details::unsigned_to_smaller_signed_conversion<SRC, DST>>* = nullptr>
inline void convert_impl(const SRC& from, DST& target)
{
checkUpperLimit<SRC, DST>(from);
target = static_cast<DST>(from);
}
template <typename SRC, typename DST,
typename details::EnableIf<details::floating_to_signed_conversion<SRC, DST>>* =
nullptr>
inline void convert_impl(const SRC& from, DST& target)
{
checkLowerLimitFloat<SRC, DST>(from);
checkUpperLimitFloat<SRC, DST>(from);
if (from != static_cast<SRC>(static_cast<DST>(from)))
{
throw RangeException("Floating point truncated");
}
target = static_cast<DST>(from);
}
template <typename SRC, typename DST,
typename details::EnableIf<
details::floating_to_unsigned_conversion<SRC, DST>>* = nullptr>
inline void convert_impl(const SRC& from, DST& target)
{
if (from < 0)
{
throw RangeException("Value is negative and can't be converted to signed");
}
checkLowerLimitFloat<SRC, DST>(from);
if (from != static_cast<SRC>(static_cast<DST>(from)))
{
throw RangeException("Floating point truncated");
}
target = static_cast<DST>(from);
}
template <typename SRC, typename DST,
typename details::EnableIf<details::integer_to_floating_conversion<SRC, DST>>* =
nullptr>
inline void convert_impl(const SRC& from, DST& target)
{
checkTruncation<SRC, DST>(from);
target = static_cast<DST>(from);
}
} // end namespace details
} // namespace RosMsgParser
#endif // VARIANT_H