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
|
// Components for compile-time parsing of numbers -*- C++ -*-
// Copyright (C) 2013-2016 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.
// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
// <http://www.gnu.org/licenses/>.
/** @file bits/parse_numbers.h
* This is an internal header file, included by other library headers.
* Do not attempt to use it directly. @headername{chrono}
*/
#ifndef _GLIBCXX_PARSE_NUMBERS_H
#define _GLIBCXX_PARSE_NUMBERS_H 1
#pragma GCC system_header
// From n3642.pdf except I added binary literals and digit separator '\''.
#if __cplusplus > 201103L
#include <limits>
namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
namespace __parse_int
{
template<unsigned _Base, char _Dig>
struct _Digit;
template<unsigned _Base>
struct _Digit<_Base, '0'> : integral_constant<unsigned, 0>
{
using __valid = true_type;
};
template<unsigned _Base>
struct _Digit<_Base, '1'> : integral_constant<unsigned, 1>
{
using __valid = true_type;
};
template<unsigned _Base, unsigned _Val>
struct _Digit_impl : integral_constant<unsigned, _Val>
{
static_assert(_Base > _Val, "invalid digit");
using __valid = true_type;
};
template<unsigned _Base>
struct _Digit<_Base, '2'> : _Digit_impl<_Base, 2>
{ };
template<unsigned _Base>
struct _Digit<_Base, '3'> : _Digit_impl<_Base, 3>
{ };
template<unsigned _Base>
struct _Digit<_Base, '4'> : _Digit_impl<_Base, 4>
{ };
template<unsigned _Base>
struct _Digit<_Base, '5'> : _Digit_impl<_Base, 5>
{ };
template<unsigned _Base>
struct _Digit<_Base, '6'> : _Digit_impl<_Base, 6>
{ };
template<unsigned _Base>
struct _Digit<_Base, '7'> : _Digit_impl<_Base, 7>
{ };
template<unsigned _Base>
struct _Digit<_Base, '8'> : _Digit_impl<_Base, 8>
{ };
template<unsigned _Base>
struct _Digit<_Base, '9'> : _Digit_impl<_Base, 9>
{ };
template<unsigned _Base>
struct _Digit<_Base, 'a'> : _Digit_impl<_Base, 0xa>
{ };
template<unsigned _Base>
struct _Digit<_Base, 'A'> : _Digit_impl<_Base, 0xa>
{ };
template<unsigned _Base>
struct _Digit<_Base, 'b'> : _Digit_impl<_Base, 0xb>
{ };
template<unsigned _Base>
struct _Digit<_Base, 'B'> : _Digit_impl<_Base, 0xb>
{ };
template<unsigned _Base>
struct _Digit<_Base, 'c'> : _Digit_impl<_Base, 0xc>
{ };
template<unsigned _Base>
struct _Digit<_Base, 'C'> : _Digit_impl<_Base, 0xc>
{ };
template<unsigned _Base>
struct _Digit<_Base, 'd'> : _Digit_impl<_Base, 0xd>
{ };
template<unsigned _Base>
struct _Digit<_Base, 'D'> : _Digit_impl<_Base, 0xd>
{ };
template<unsigned _Base>
struct _Digit<_Base, 'e'> : _Digit_impl<_Base, 0xe>
{ };
template<unsigned _Base>
struct _Digit<_Base, 'E'> : _Digit_impl<_Base, 0xe>
{ };
template<unsigned _Base>
struct _Digit<_Base, 'f'> : _Digit_impl<_Base, 0xf>
{ };
template<unsigned _Base>
struct _Digit<_Base, 'F'> : _Digit_impl<_Base, 0xf>
{ };
// Digit separator
template<unsigned _Base>
struct _Digit<_Base, '\''> : integral_constant<unsigned, 0>
{
using __valid = false_type;
};
//------------------------------------------------------------------------------
template<unsigned long long _Val>
using __ull_constant = integral_constant<unsigned long long, _Val>;
template<unsigned _Base, char _Dig, char... _Digs>
struct _Power_help
{
using __next = typename _Power_help<_Base, _Digs...>::type;
using __valid_digit = typename _Digit<_Base, _Dig>::__valid;
using type
= __ull_constant<__next::value * (__valid_digit{} ? _Base : 1ULL)>;
};
template<unsigned _Base, char _Dig>
struct _Power_help<_Base, _Dig>
{
using __valid_digit = typename _Digit<_Base, _Dig>::__valid;
using type = __ull_constant<__valid_digit::value>;
};
template<unsigned _Base, char... _Digs>
struct _Power : _Power_help<_Base, _Digs...>::type
{ };
template<unsigned _Base>
struct _Power<_Base> : __ull_constant<0>
{ };
//------------------------------------------------------------------------------
template<unsigned _Base, unsigned long long _Pow, char _Dig, char... _Digs>
struct _Number_help
{
using __digit = _Digit<_Base, _Dig>;
using __valid_digit = typename __digit::__valid;
using __next = _Number_help<_Base,
__valid_digit::value ? _Pow / _Base : _Pow,
_Digs...>;
using type = __ull_constant<_Pow * __digit::value + __next::type::value>;
static_assert((type::value / _Pow) == __digit::value,
"integer literal does not fit in unsigned long long");
};
template<unsigned _Base, unsigned long long _Pow, char _Dig>
struct _Number_help<_Base, _Pow, _Dig>
{
//static_assert(_Pow == 1U, "power should be one");
using type = __ull_constant<_Digit<_Base, _Dig>::value>;
};
template<unsigned _Base, char... _Digs>
struct _Number
: _Number_help<_Base, _Power<_Base, _Digs...>::value, _Digs...>::type
{ };
template<unsigned _Base>
struct _Number<_Base>
: __ull_constant<0>
{ };
//------------------------------------------------------------------------------
template<char... _Digs>
struct _Parse_int;
template<char... _Digs>
struct _Parse_int<'0', 'b', _Digs...>
: _Number<2U, _Digs...>::type
{ };
template<char... _Digs>
struct _Parse_int<'0', 'B', _Digs...>
: _Number<2U, _Digs...>::type
{ };
template<char... _Digs>
struct _Parse_int<'0', 'x', _Digs...>
: _Number<16U, _Digs...>::type
{ };
template<char... _Digs>
struct _Parse_int<'0', 'X', _Digs...>
: _Number<16U, _Digs...>::type
{ };
template<char... _Digs>
struct _Parse_int<'0', _Digs...>
: _Number<8U, _Digs...>::type
{ };
template<char... _Digs>
struct _Parse_int
: _Number<10U, _Digs...>::type
{ };
} // namespace __parse_int
namespace __select_int
{
template<unsigned long long _Val, typename... _Ints>
struct _Select_int_base;
template<unsigned long long _Val, typename _IntType, typename... _Ints>
struct _Select_int_base<_Val, _IntType, _Ints...>
: conditional_t<(_Val <= std::numeric_limits<_IntType>::max()),
integral_constant<_IntType, _Val>,
_Select_int_base<_Val, _Ints...>>
{ };
template<unsigned long long _Val>
struct _Select_int_base<_Val>
{ };
template<char... _Digs>
using _Select_int = typename _Select_int_base<
__parse_int::_Parse_int<_Digs...>::value,
unsigned char,
unsigned short,
unsigned int,
unsigned long,
unsigned long long
>::type;
} // namespace __select_int
_GLIBCXX_END_NAMESPACE_VERSION
} // namespace std
#endif // __cplusplus > 201103L
#endif // _GLIBCXX_PARSE_NUMBERS_H
|
