1 | |
2 | #ifndef BOOST_MPL_STRING_HPP_INCLUDED |
3 | #define BOOST_MPL_STRING_HPP_INCLUDED |
4 | |
5 | // Copyright Eric Niebler 2009 |
6 | // |
7 | // Distributed under the Boost Software License, Version 1.0. |
8 | // (See accompanying file LICENSE_1_0.txt or copy at |
9 | // http://www.boost.org/LICENSE_1_0.txt) |
10 | // |
11 | // See http://www.boost.org/libs/mpl for documentation. |
12 | |
13 | // $Id: string.hpp 49239 2009-04-01 09:10:26Z eric_niebler $ |
14 | // $Date: 2009-04-01 02:10:26 -0700 (Wed, 1 Apr 2009) $ |
15 | // $Revision: 49239 $ |
16 | // |
17 | // Thanks to: |
18 | // Dmitry Goncharov for porting this to the Sun compiler |
19 | |
20 | #include <boost/config.hpp> |
21 | #include <boost/detail/workaround.hpp> |
22 | #include <boost/predef/other/endian.h> |
23 | #include <boost/mpl/limits/string.hpp> |
24 | #include <boost/mpl/if.hpp> |
25 | #include <boost/mpl/char.hpp> |
26 | #include <boost/mpl/copy.hpp> |
27 | #include <boost/mpl/size.hpp> |
28 | #include <boost/mpl/empty.hpp> |
29 | #include <boost/mpl/assert.hpp> |
30 | #include <boost/mpl/size_t.hpp> |
31 | #include <boost/mpl/begin_end.hpp> |
32 | #include <boost/mpl/joint_view.hpp> |
33 | #include <boost/mpl/insert_range.hpp> |
34 | #include <boost/mpl/back_inserter.hpp> |
35 | #include <boost/mpl/front_inserter.hpp> |
36 | #include <boost/mpl/iterator_range.hpp> |
37 | #include <boost/preprocessor/arithmetic/dec.hpp> |
38 | #include <boost/preprocessor/arithmetic/add.hpp> |
39 | #include <boost/preprocessor/arithmetic/div.hpp> |
40 | #include <boost/preprocessor/punctuation/comma_if.hpp> |
41 | #include <boost/preprocessor/repetition/repeat.hpp> |
42 | #include <boost/preprocessor/repetition/enum_params.hpp> |
43 | #include <boost/preprocessor/repetition/repeat_from_to.hpp> |
44 | #include <boost/preprocessor/repetition/enum_shifted_params.hpp> |
45 | #include <boost/preprocessor/repetition/enum_trailing_params.hpp> |
46 | #include <boost/preprocessor/repetition/enum_params_with_a_default.hpp> |
47 | |
48 | #include <iterator> // for bidirectional_iterator_tag |
49 | #include <climits> |
50 | |
51 | namespace boost { namespace mpl |
52 | { |
53 | #define BOOST_MPL_STRING_MAX_PARAMS \ |
54 | BOOST_PP_DIV(BOOST_PP_ADD(BOOST_MPL_LIMIT_STRING_SIZE, 3), 4) |
55 | |
56 | // Low-level bit-twiddling is done by macros. Any implementation-defined behavior of |
57 | // multi-character literals should be localized to these macros. |
58 | |
59 | #define BOOST_MPL_MULTICHAR_LENGTH(c) \ |
60 | (std::size_t)((c<CHAR_MIN) ? 4 : ((c>0xffffff)+(c>0xffff)+(c>0xff)+1)) |
61 | |
62 | #if BOOST_ENDIAN_LITTLE_BYTE && defined(__SUNPRO_CC) |
63 | |
64 | #define BOOST_MPL_MULTICHAR_AT(c,i) \ |
65 | (char)(0xff&((unsigned)(c)>>(8*(std::size_t)(i)))) |
66 | |
67 | #define BOOST_MPL_MULTICHAR_PUSH_BACK(c,i) \ |
68 | ((((unsigned char)(i))<<(BOOST_MPL_MULTICHAR_LENGTH(c)*8))|(unsigned)(c)) |
69 | |
70 | #define BOOST_MPL_MULTICHAR_PUSH_FRONT(c,i) \ |
71 | (((unsigned)(c)<<8)|(unsigned char)(i)) |
72 | |
73 | #define BOOST_MPL_MULTICHAR_POP_BACK(c) \ |
74 | (((1<<((BOOST_MPL_MULTICHAR_LENGTH(c)-1)*8))-1)&(unsigned)(c)) |
75 | |
76 | #define BOOST_MPL_MULTICHAR_POP_FRONT(c) \ |
77 | ((unsigned)(c)>>8) |
78 | |
79 | #else |
80 | |
81 | #define BOOST_MPL_MULTICHAR_AT(c,i) \ |
82 | (char)(0xff&((unsigned)(c)>>(8*(BOOST_MPL_MULTICHAR_LENGTH(c)-(std::size_t)(i)-1)))) |
83 | |
84 | #define BOOST_MPL_MULTICHAR_PUSH_BACK(c,i) \ |
85 | (((unsigned)(c)<<8)|(unsigned char)(i)) |
86 | |
87 | #define BOOST_MPL_MULTICHAR_PUSH_FRONT(c,i) \ |
88 | ((((unsigned char)(i))<<(BOOST_MPL_MULTICHAR_LENGTH(c)*8))|(unsigned)(c)) |
89 | |
90 | #define BOOST_MPL_MULTICHAR_POP_BACK(c) \ |
91 | ((unsigned)(c)>>8) |
92 | |
93 | #define BOOST_MPL_MULTICHAR_POP_FRONT(c) \ |
94 | (((1<<((BOOST_MPL_MULTICHAR_LENGTH(c)-1)*8))-1)&(unsigned)(c)) |
95 | |
96 | #endif |
97 | |
98 | struct string_tag; |
99 | struct string_iterator_tag; |
100 | |
101 | template<BOOST_PP_ENUM_PARAMS_WITH_A_DEFAULT(BOOST_MPL_STRING_MAX_PARAMS, int C, 0)> |
102 | struct string; |
103 | |
104 | template<typename Sequence, int I, int J> |
105 | struct string_iterator; |
106 | |
107 | template<typename Sequence> |
108 | struct sequence_tag; |
109 | |
110 | template<typename Tag> |
111 | struct size_impl; |
112 | |
113 | template<> |
114 | struct size_impl<mpl::string_tag> |
115 | { |
116 | template<typename Sequence> |
117 | struct apply; |
118 | |
119 | #define M0(z, n, data) \ |
120 | + BOOST_MPL_MULTICHAR_LENGTH(BOOST_PP_CAT(C,n)) |
121 | |
122 | #define M1(z, n, data) \ |
123 | template<BOOST_PP_ENUM_PARAMS_Z(z, n, int C)> \ |
124 | struct apply<mpl::string<BOOST_PP_ENUM_PARAMS_Z(z, n, C)> > \ |
125 | : mpl::size_t<(0 BOOST_PP_REPEAT_ ## z(n, M0, ~))> \ |
126 | {}; |
127 | |
128 | BOOST_PP_REPEAT_FROM_TO(1, BOOST_PP_INC(BOOST_MPL_STRING_MAX_PARAMS), M1, ~) |
129 | #undef M0 |
130 | #undef M1 |
131 | }; |
132 | |
133 | template<> |
134 | struct size_impl<mpl::string_tag>::apply<mpl::string<> > |
135 | : mpl::size_t<0> |
136 | {}; |
137 | |
138 | template<typename Tag> |
139 | struct begin_impl; |
140 | |
141 | template<> |
142 | struct begin_impl<mpl::string_tag> |
143 | { |
144 | template<typename Sequence> |
145 | struct apply |
146 | { |
147 | typedef mpl::string_iterator<Sequence, 0, 0> type; |
148 | }; |
149 | }; |
150 | |
151 | template<typename Tag> |
152 | struct end_impl; |
153 | |
154 | template<> |
155 | struct end_impl<mpl::string_tag> |
156 | { |
157 | template<typename Sequence> |
158 | struct apply; |
159 | |
160 | #define M0(z,n,data) \ |
161 | template<BOOST_PP_ENUM_PARAMS_Z(z, n, int C)> \ |
162 | struct apply<mpl::string<BOOST_PP_ENUM_PARAMS_Z(z, n, C)> > \ |
163 | { \ |
164 | typedef mpl::string_iterator<mpl::string<BOOST_PP_ENUM_PARAMS_Z(z, n, C)>, n, 0> type; \ |
165 | }; |
166 | |
167 | BOOST_PP_REPEAT_FROM_TO(1, BOOST_PP_INC(BOOST_MPL_STRING_MAX_PARAMS), M0, ~) |
168 | #undef M0 |
169 | }; |
170 | |
171 | template<> |
172 | struct end_impl<mpl::string_tag>::apply<mpl::string<> > |
173 | { |
174 | typedef mpl::string_iterator<mpl::string<>, 0, 0> type; |
175 | }; |
176 | |
177 | template<typename Tag> |
178 | struct push_back_impl; |
179 | |
180 | template<> |
181 | struct push_back_impl<mpl::string_tag> |
182 | { |
183 | template<typename Sequence, typename Value, bool B = (4==BOOST_MPL_MULTICHAR_LENGTH(Sequence::back_))> |
184 | struct apply |
185 | { |
186 | BOOST_MPL_ASSERT_MSG( |
187 | (BOOST_MPL_LIMIT_STRING_SIZE != mpl::size<Sequence>::type::value) |
188 | , PUSH_BACK_FAILED_MPL_STRING_IS_FULL |
189 | , (Sequence) |
190 | ); |
191 | // If the above assertion didn't fire, then the string is sparse. |
192 | // Repack the string and retry the push_back |
193 | typedef |
194 | typename mpl::push_back< |
195 | typename mpl::copy< |
196 | Sequence |
197 | , mpl::back_inserter<mpl::string<> > |
198 | >::type |
199 | , Value |
200 | >::type |
201 | type; |
202 | }; |
203 | |
204 | template<typename Value> |
205 | struct apply<mpl::string<>, Value, false> |
206 | { |
207 | typedef mpl::string<(char)Value::value> type; |
208 | }; |
209 | |
210 | #define M0(z,n,data) \ |
211 | template<BOOST_PP_ENUM_PARAMS_Z(z, n, int C), typename Value> \ |
212 | struct apply<mpl::string<BOOST_PP_ENUM_PARAMS_Z(z, n, C)>, Value, false> \ |
213 | { \ |
214 | typedef \ |
215 | mpl::string< \ |
216 | BOOST_PP_ENUM_PARAMS_Z(z, BOOST_PP_DEC(n), C) \ |
217 | BOOST_PP_COMMA_IF(BOOST_PP_DEC(n)) \ |
218 | ((unsigned)BOOST_PP_CAT(C,BOOST_PP_DEC(n))>0xffffff) \ |
219 | ?BOOST_PP_CAT(C,BOOST_PP_DEC(n)) \ |
220 | :BOOST_MPL_MULTICHAR_PUSH_BACK(BOOST_PP_CAT(C,BOOST_PP_DEC(n)), Value::value) \ |
221 | , ((unsigned)BOOST_PP_CAT(C,BOOST_PP_DEC(n))>0xffffff) \ |
222 | ?(char)Value::value \ |
223 | :0 \ |
224 | > \ |
225 | type; \ |
226 | }; |
227 | |
228 | BOOST_PP_REPEAT_FROM_TO(1, BOOST_MPL_STRING_MAX_PARAMS, M0, ~) |
229 | #undef M0 |
230 | |
231 | template<BOOST_PP_ENUM_PARAMS(BOOST_MPL_STRING_MAX_PARAMS, int C), typename Value> |
232 | struct apply<mpl::string<BOOST_PP_ENUM_PARAMS(BOOST_MPL_STRING_MAX_PARAMS, C)>, Value, false> |
233 | { |
234 | typedef |
235 | mpl::string< |
236 | BOOST_PP_ENUM_PARAMS(BOOST_PP_DEC(BOOST_MPL_STRING_MAX_PARAMS), C) |
237 | , BOOST_MPL_MULTICHAR_PUSH_BACK(BOOST_PP_CAT(C,BOOST_PP_DEC(BOOST_MPL_STRING_MAX_PARAMS)), Value::value) |
238 | > |
239 | type; |
240 | }; |
241 | }; |
242 | |
243 | template<typename Tag> |
244 | struct has_push_back_impl; |
245 | |
246 | template<> |
247 | struct has_push_back_impl<mpl::string_tag> |
248 | { |
249 | template<typename Sequence> |
250 | struct apply |
251 | : mpl::true_ |
252 | {}; |
253 | }; |
254 | |
255 | template<typename Tag> |
256 | struct pop_back_impl; |
257 | |
258 | template<> |
259 | struct pop_back_impl<mpl::string_tag> |
260 | { |
261 | template<typename Sequence> |
262 | struct apply; |
263 | |
264 | #define M0(z,n,data) \ |
265 | template<BOOST_PP_ENUM_PARAMS_Z(z, n, int C)> \ |
266 | struct apply<mpl::string<BOOST_PP_ENUM_PARAMS_Z(z, n, C)> > \ |
267 | { \ |
268 | BOOST_MPL_ASSERT_MSG((C0 != 0), POP_BACK_FAILED_MPL_STRING_IS_EMPTY, (mpl::string<>)); \ |
269 | typedef \ |
270 | mpl::string< \ |
271 | BOOST_PP_ENUM_PARAMS_Z(z, BOOST_PP_DEC(n), C) \ |
272 | BOOST_PP_COMMA_IF(BOOST_PP_DEC(n)) \ |
273 | BOOST_MPL_MULTICHAR_POP_BACK(BOOST_PP_CAT(C,BOOST_PP_DEC(n))) \ |
274 | > \ |
275 | type; \ |
276 | }; |
277 | |
278 | BOOST_PP_REPEAT_FROM_TO(1, BOOST_PP_INC(BOOST_MPL_STRING_MAX_PARAMS), M0, ~) |
279 | #undef M0 |
280 | }; |
281 | |
282 | template<typename Tag> |
283 | struct has_pop_back_impl; |
284 | |
285 | template<> |
286 | struct has_pop_back_impl<mpl::string_tag> |
287 | { |
288 | template<typename Sequence> |
289 | struct apply |
290 | : mpl::true_ |
291 | {}; |
292 | }; |
293 | |
294 | template<typename Tag> |
295 | struct push_front_impl; |
296 | |
297 | template<> |
298 | struct push_front_impl<mpl::string_tag> |
299 | { |
300 | template<typename Sequence, typename Value, bool B = (4==BOOST_MPL_MULTICHAR_LENGTH(Sequence::front_))> |
301 | struct apply |
302 | { |
303 | BOOST_MPL_ASSERT_MSG( |
304 | (BOOST_MPL_LIMIT_STRING_SIZE != mpl::size<Sequence>::type::value) |
305 | , PUSH_FRONT_FAILED_MPL_STRING_IS_FULL |
306 | , (Sequence) |
307 | ); |
308 | // If the above assertion didn't fire, then the string is sparse. |
309 | // Repack the string and retry the push_front. |
310 | typedef |
311 | typename mpl::push_front< |
312 | typename mpl::reverse_copy< |
313 | Sequence |
314 | , mpl::front_inserter<string<> > |
315 | >::type |
316 | , Value |
317 | >::type |
318 | type; |
319 | }; |
320 | |
321 | #if !BOOST_WORKAROUND(__SUNPRO_CC, BOOST_TESTED_AT(0x590)) |
322 | template<typename Value> |
323 | struct apply<mpl::string<>, Value, false> |
324 | { |
325 | typedef mpl::string<(char)Value::value> type; |
326 | }; |
327 | #endif |
328 | |
329 | #define M0(z,n,data) \ |
330 | template<BOOST_PP_ENUM_PARAMS_Z(z, n, int C), typename Value> \ |
331 | struct apply<mpl::string<BOOST_PP_ENUM_PARAMS_Z(z, n, C)>, Value, true> \ |
332 | { \ |
333 | typedef \ |
334 | mpl::string< \ |
335 | (char)Value::value \ |
336 | BOOST_PP_ENUM_TRAILING_PARAMS_Z(z, n, C) \ |
337 | > \ |
338 | type; \ |
339 | }; |
340 | |
341 | BOOST_PP_REPEAT_FROM_TO(1, BOOST_MPL_STRING_MAX_PARAMS, M0, ~) |
342 | #undef M0 |
343 | |
344 | template<BOOST_PP_ENUM_PARAMS(BOOST_MPL_STRING_MAX_PARAMS, int C), typename Value> |
345 | struct apply<mpl::string<BOOST_PP_ENUM_PARAMS(BOOST_MPL_STRING_MAX_PARAMS, C)>, Value, false> |
346 | { |
347 | typedef |
348 | mpl::string< |
349 | BOOST_MPL_MULTICHAR_PUSH_FRONT(C0, Value::value) |
350 | , BOOST_PP_ENUM_SHIFTED_PARAMS(BOOST_MPL_STRING_MAX_PARAMS, C) |
351 | > |
352 | type0; |
353 | |
354 | #if BOOST_WORKAROUND(__SUNPRO_CC, BOOST_TESTED_AT(0x590)) |
355 | typedef |
356 | typename mpl::if_< |
357 | mpl::empty<mpl::string<BOOST_PP_ENUM_PARAMS(BOOST_MPL_STRING_MAX_PARAMS, C)> > |
358 | , mpl::string<(char)Value::value> |
359 | , type0 |
360 | >::type |
361 | type; |
362 | #else |
363 | typedef type0 type; |
364 | #endif |
365 | }; |
366 | }; |
367 | |
368 | template<typename Tag> |
369 | struct has_push_front_impl; |
370 | |
371 | template<> |
372 | struct has_push_front_impl<mpl::string_tag> |
373 | { |
374 | template<typename Sequence> |
375 | struct apply |
376 | : mpl::true_ |
377 | {}; |
378 | }; |
379 | |
380 | template<typename Tag> |
381 | struct pop_front_impl; |
382 | |
383 | template<> |
384 | struct pop_front_impl<mpl::string_tag> |
385 | { |
386 | template<typename Sequence, bool B = (1==BOOST_MPL_MULTICHAR_LENGTH(Sequence::front_))> |
387 | struct apply; |
388 | |
389 | #define M0(z,n,data) \ |
390 | template<BOOST_PP_ENUM_PARAMS_Z(z, n, int C)> \ |
391 | struct apply<mpl::string<BOOST_PP_ENUM_PARAMS_Z(z, n, C)>, true> \ |
392 | { \ |
393 | BOOST_MPL_ASSERT_MSG((C0 != 0), POP_FRONT_FAILED_MPL_STRING_IS_EMPTY, (mpl::string<>)); \ |
394 | typedef \ |
395 | mpl::string<BOOST_PP_ENUM_SHIFTED_PARAMS_Z(z, n, C)> \ |
396 | type; \ |
397 | }; |
398 | |
399 | BOOST_PP_REPEAT_FROM_TO(1, BOOST_MPL_STRING_MAX_PARAMS, M0, ~) |
400 | #undef M0 |
401 | |
402 | template<BOOST_PP_ENUM_PARAMS(BOOST_MPL_STRING_MAX_PARAMS, int C)> |
403 | struct apply<mpl::string<BOOST_PP_ENUM_PARAMS(BOOST_MPL_STRING_MAX_PARAMS, C)>, false> |
404 | { |
405 | typedef |
406 | mpl::string< |
407 | BOOST_MPL_MULTICHAR_POP_FRONT(C0) |
408 | , BOOST_PP_ENUM_SHIFTED_PARAMS(BOOST_MPL_STRING_MAX_PARAMS, C) |
409 | > |
410 | type; |
411 | }; |
412 | }; |
413 | |
414 | template<typename Tag> |
415 | struct has_pop_front_impl; |
416 | |
417 | template<> |
418 | struct has_pop_front_impl<mpl::string_tag> |
419 | { |
420 | template<typename Sequence> |
421 | struct apply |
422 | : mpl::true_ |
423 | {}; |
424 | }; |
425 | |
426 | template<typename Tag> |
427 | struct insert_range_impl; |
428 | |
429 | template<> |
430 | struct insert_range_impl<mpl::string_tag> |
431 | { |
432 | template<typename Sequence, typename Pos, typename Range> |
433 | struct apply |
434 | : mpl::copy< |
435 | mpl::joint_view< |
436 | mpl::iterator_range< |
437 | mpl::string_iterator<Sequence, 0, 0> |
438 | , Pos |
439 | > |
440 | , mpl::joint_view< |
441 | Range |
442 | , mpl::iterator_range< |
443 | Pos |
444 | , typename mpl::end<Sequence>::type |
445 | > |
446 | > |
447 | > |
448 | , mpl::back_inserter<mpl::string<> > |
449 | > |
450 | {}; |
451 | }; |
452 | |
453 | template<typename Tag> |
454 | struct insert_impl; |
455 | |
456 | template<> |
457 | struct insert_impl<mpl::string_tag> |
458 | { |
459 | template<typename Sequence, typename Pos, typename Value> |
460 | struct apply |
461 | : mpl::insert_range<Sequence, Pos, mpl::string<(char)Value::value> > |
462 | {}; |
463 | }; |
464 | |
465 | template<typename Tag> |
466 | struct erase_impl; |
467 | |
468 | template<> |
469 | struct erase_impl<mpl::string_tag> |
470 | { |
471 | template<typename Sequence, typename First, typename Last> |
472 | struct apply |
473 | : mpl::copy< |
474 | mpl::joint_view< |
475 | mpl::iterator_range< |
476 | mpl::string_iterator<Sequence, 0, 0> |
477 | , First |
478 | > |
479 | , mpl::iterator_range< |
480 | typename mpl::if_na<Last, typename mpl::next<First>::type>::type |
481 | , typename mpl::end<Sequence>::type |
482 | > |
483 | > |
484 | , mpl::back_inserter<mpl::string<> > |
485 | > |
486 | {}; |
487 | }; |
488 | |
489 | template<typename Tag> |
490 | struct clear_impl; |
491 | |
492 | template<> |
493 | struct clear_impl<mpl::string_tag> |
494 | { |
495 | template<typename> |
496 | struct apply |
497 | { |
498 | typedef mpl::string<> type; |
499 | }; |
500 | }; |
501 | |
502 | #define M0(z, n, data) \ |
503 | template<BOOST_PP_ENUM_PARAMS(BOOST_MPL_STRING_MAX_PARAMS, int C), int J> \ |
504 | struct string_iterator<mpl::string<BOOST_PP_ENUM_PARAMS(BOOST_MPL_STRING_MAX_PARAMS, C)>, n, J> \ |
505 | { \ |
506 | enum { eomc_ = (BOOST_MPL_MULTICHAR_LENGTH(BOOST_PP_CAT(C, n)) == J + 1) }; \ |
507 | typedef mpl::string<BOOST_PP_ENUM_PARAMS(BOOST_MPL_STRING_MAX_PARAMS, C)> string; \ |
508 | typedef std::bidirectional_iterator_tag category; \ |
509 | typedef \ |
510 | mpl::string_iterator<string, n + eomc_, eomc_ ? 0 : J + 1> \ |
511 | next; \ |
512 | typedef \ |
513 | mpl::string_iterator<string, n, J - 1> \ |
514 | prior; \ |
515 | typedef mpl::char_<BOOST_MPL_MULTICHAR_AT(BOOST_PP_CAT(C, n), J)> type; \ |
516 | }; \ |
517 | template<BOOST_PP_ENUM_PARAMS(BOOST_MPL_STRING_MAX_PARAMS, int C)> \ |
518 | struct string_iterator<mpl::string<BOOST_PP_ENUM_PARAMS(BOOST_MPL_STRING_MAX_PARAMS, C)>, n, 0> \ |
519 | { \ |
520 | enum { eomc_ = (BOOST_MPL_MULTICHAR_LENGTH(BOOST_PP_CAT(C, n)) == 1) }; \ |
521 | typedef mpl::string<BOOST_PP_ENUM_PARAMS(BOOST_MPL_STRING_MAX_PARAMS, C)> string; \ |
522 | typedef std::bidirectional_iterator_tag category; \ |
523 | typedef \ |
524 | mpl::string_iterator<string, n + eomc_, !eomc_> \ |
525 | next; \ |
526 | typedef \ |
527 | mpl::string_iterator< \ |
528 | string \ |
529 | , n - 1 \ |
530 | , BOOST_MPL_MULTICHAR_LENGTH(BOOST_PP_CAT(C, BOOST_PP_DEC(n))) - 1 \ |
531 | > \ |
532 | prior; \ |
533 | typedef mpl::char_<BOOST_MPL_MULTICHAR_AT(BOOST_PP_CAT(C, n), 0)> type; \ |
534 | }; |
535 | |
536 | BOOST_PP_REPEAT(BOOST_MPL_STRING_MAX_PARAMS, M0, ~) |
537 | #undef M0 |
538 | |
539 | template<BOOST_PP_ENUM_PARAMS(BOOST_MPL_STRING_MAX_PARAMS, int C)> |
540 | struct string |
541 | { |
542 | /// INTERNAL ONLY |
543 | enum |
544 | { |
545 | front_ = C0 |
546 | , back_ = BOOST_PP_CAT(C, BOOST_PP_DEC(BOOST_MPL_STRING_MAX_PARAMS)) |
547 | }; |
548 | |
549 | typedef char value_type; |
550 | typedef string type; |
551 | typedef string_tag tag; |
552 | }; |
553 | |
554 | namespace aux_ |
555 | { |
556 | template<typename It, typename End> |
557 | struct next_unless |
558 | : mpl::next<It> |
559 | {}; |
560 | |
561 | template<typename End> |
562 | struct next_unless<End, End> |
563 | { |
564 | typedef End type; |
565 | }; |
566 | |
567 | template<typename It, typename End> |
568 | struct deref_unless |
569 | : mpl::deref<It> |
570 | {}; |
571 | |
572 | template<typename End> |
573 | struct deref_unless<End, End> |
574 | { |
575 | typedef mpl::char_<'\0'> type; |
576 | }; |
577 | } |
578 | |
579 | template<typename Sequence> |
580 | struct c_str |
581 | { |
582 | typedef typename mpl::end<Sequence>::type iend; |
583 | typedef typename mpl::begin<Sequence>::type i0; |
584 | #define M0(z, n, data) \ |
585 | typedef \ |
586 | typename mpl::aux_::next_unless<BOOST_PP_CAT(i, n), iend>::type \ |
587 | BOOST_PP_CAT(i, BOOST_PP_INC(n)); |
588 | BOOST_PP_REPEAT(BOOST_MPL_LIMIT_STRING_SIZE, M0, ~) |
589 | #undef M0 |
590 | |
591 | typedef c_str type; |
592 | static typename Sequence::value_type const value[BOOST_MPL_LIMIT_STRING_SIZE+1]; |
593 | }; |
594 | |
595 | template<typename Sequence> |
596 | typename Sequence::value_type const c_str<Sequence>::value[BOOST_MPL_LIMIT_STRING_SIZE+1] = |
597 | { |
598 | #define M0(z, n, data) \ |
599 | mpl::aux_::deref_unless<BOOST_PP_CAT(i, n), iend>::type::value, |
600 | BOOST_PP_REPEAT(BOOST_MPL_LIMIT_STRING_SIZE, M0, ~) |
601 | #undef M0 |
602 | '\0' |
603 | }; |
604 | |
605 | }} // namespace boost |
606 | |
607 | #endif // BOOST_MPL_STRING_HPP_INCLUDED |
608 | |