1 | #ifndef BOOST_LEXICAL_CAST_INCLUDED |
---|
2 | #define BOOST_LEXICAL_CAST_INCLUDED |
---|
3 | |
---|
4 | // Boost lexical_cast.hpp header -------------------------------------------// |
---|
5 | // |
---|
6 | // See http://www.boost.org/libs/conversion for documentation. |
---|
7 | // See end of this header for rights and permissions. |
---|
8 | // |
---|
9 | // what: lexical_cast custom keyword cast |
---|
10 | // who: contributed by Kevlin Henney, |
---|
11 | // enhanced with contributions from Terje Slettebo, |
---|
12 | // with additional fixes and suggestions from Gennaro Prota, |
---|
13 | // Beman Dawes, Dave Abrahams, Daryle Walker, Peter Dimov, |
---|
14 | // Alexander Nasonov and other Boosters |
---|
15 | // when: November 2000, March 2003, June 2005, June 2006 |
---|
16 | |
---|
17 | #include <climits> |
---|
18 | #include <cstddef> |
---|
19 | #include <istream> |
---|
20 | #include <string> |
---|
21 | #include <typeinfo> |
---|
22 | #include <exception> |
---|
23 | #include <boost/config.hpp> |
---|
24 | #include <boost/limits.hpp> |
---|
25 | #include <boost/mpl/if.hpp> |
---|
26 | #include <boost/throw_exception.hpp> |
---|
27 | #include <boost/type_traits/is_pointer.hpp> |
---|
28 | #include <boost/type_traits/make_unsigned.hpp> |
---|
29 | #include <boost/call_traits.hpp> |
---|
30 | #include <boost/static_assert.hpp> |
---|
31 | #include <boost/detail/lcast_precision.hpp> |
---|
32 | #include <boost/detail/workaround.hpp> |
---|
33 | |
---|
34 | #ifndef BOOST_NO_STD_LOCALE |
---|
35 | #include <locale> |
---|
36 | #endif |
---|
37 | |
---|
38 | #ifdef BOOST_NO_STRINGSTREAM |
---|
39 | #include <strstream> |
---|
40 | #else |
---|
41 | #include <sstream> |
---|
42 | #endif |
---|
43 | |
---|
44 | #if defined(BOOST_NO_STRINGSTREAM) || defined(BOOST_NO_STD_WSTRING) |
---|
45 | #define BOOST_LCAST_NO_WCHAR_T |
---|
46 | #endif |
---|
47 | |
---|
48 | #ifdef BOOST_NO_TYPEID |
---|
49 | #define BOOST_LCAST_THROW_BAD_CAST(S, T) throw_exception(bad_lexical_cast()) |
---|
50 | #else |
---|
51 | #define BOOST_LCAST_THROW_BAD_CAST(Source, Target) \ |
---|
52 | throw_exception(bad_lexical_cast(typeid(Source), typeid(Target))) |
---|
53 | #endif |
---|
54 | |
---|
55 | namespace boost |
---|
56 | { |
---|
57 | // exception used to indicate runtime lexical_cast failure |
---|
58 | class bad_lexical_cast : public std::bad_cast |
---|
59 | |
---|
60 | #if defined(__BORLANDC__) && BOOST_WORKAROUND( __BORLANDC__, < 0x560 ) |
---|
61 | // under bcc32 5.5.1 bad_cast doesn't derive from exception |
---|
62 | , public std::exception |
---|
63 | #endif |
---|
64 | |
---|
65 | { |
---|
66 | public: |
---|
67 | bad_lexical_cast() : |
---|
68 | #ifndef BOOST_NO_TYPEID |
---|
69 | source(&typeid(void)), target(&typeid(void)) |
---|
70 | #else |
---|
71 | source(0), target(0) // this breaks getters |
---|
72 | #endif |
---|
73 | { |
---|
74 | } |
---|
75 | |
---|
76 | bad_lexical_cast( |
---|
77 | const std::type_info &source_type_arg, |
---|
78 | const std::type_info &target_type_arg) : |
---|
79 | source(&source_type_arg), target(&target_type_arg) |
---|
80 | { |
---|
81 | } |
---|
82 | |
---|
83 | const std::type_info &source_type() const |
---|
84 | { |
---|
85 | return *source; |
---|
86 | } |
---|
87 | const std::type_info &target_type() const |
---|
88 | { |
---|
89 | return *target; |
---|
90 | } |
---|
91 | |
---|
92 | virtual const char *what() const throw() |
---|
93 | { |
---|
94 | return "bad lexical cast: " |
---|
95 | "source type value could not be interpreted as target"; |
---|
96 | } |
---|
97 | virtual ~bad_lexical_cast() throw() |
---|
98 | { |
---|
99 | } |
---|
100 | private: |
---|
101 | const std::type_info *source; |
---|
102 | const std::type_info *target; |
---|
103 | }; |
---|
104 | |
---|
105 | namespace detail // selectors for choosing stream character type |
---|
106 | { |
---|
107 | template<typename Type> |
---|
108 | struct stream_char |
---|
109 | { |
---|
110 | typedef char type; |
---|
111 | }; |
---|
112 | |
---|
113 | #ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION |
---|
114 | template<class CharT, class Traits, class Alloc> |
---|
115 | struct stream_char< std::basic_string<CharT,Traits,Alloc> > |
---|
116 | { |
---|
117 | typedef CharT type; |
---|
118 | }; |
---|
119 | #endif |
---|
120 | |
---|
121 | #ifndef BOOST_LCAST_NO_WCHAR_T |
---|
122 | #ifndef BOOST_NO_INTRINSIC_WCHAR_T |
---|
123 | template<> |
---|
124 | struct stream_char<wchar_t> |
---|
125 | { |
---|
126 | typedef wchar_t type; |
---|
127 | }; |
---|
128 | #endif |
---|
129 | |
---|
130 | template<> |
---|
131 | struct stream_char<wchar_t *> |
---|
132 | { |
---|
133 | typedef wchar_t type; |
---|
134 | }; |
---|
135 | |
---|
136 | template<> |
---|
137 | struct stream_char<const wchar_t *> |
---|
138 | { |
---|
139 | typedef wchar_t type; |
---|
140 | }; |
---|
141 | |
---|
142 | #ifdef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION |
---|
143 | template<> |
---|
144 | struct stream_char<std::wstring> |
---|
145 | { |
---|
146 | typedef wchar_t type; |
---|
147 | }; |
---|
148 | #endif |
---|
149 | #endif |
---|
150 | |
---|
151 | template<typename TargetChar, typename SourceChar> |
---|
152 | struct widest_char |
---|
153 | { |
---|
154 | typedef TargetChar type; |
---|
155 | }; |
---|
156 | |
---|
157 | template<> |
---|
158 | struct widest_char<char, wchar_t> |
---|
159 | { |
---|
160 | typedef wchar_t type; |
---|
161 | }; |
---|
162 | } |
---|
163 | |
---|
164 | namespace detail // deduce_char_traits template |
---|
165 | { |
---|
166 | #ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION |
---|
167 | template<class CharT, class Target, class Source> |
---|
168 | struct deduce_char_traits |
---|
169 | { |
---|
170 | typedef std::char_traits<CharT> type; |
---|
171 | }; |
---|
172 | |
---|
173 | template<class CharT, class Traits, class Alloc, class Source> |
---|
174 | struct deduce_char_traits< CharT |
---|
175 | , std::basic_string<CharT,Traits,Alloc> |
---|
176 | , Source |
---|
177 | > |
---|
178 | { |
---|
179 | typedef Traits type; |
---|
180 | }; |
---|
181 | |
---|
182 | template<class CharT, class Target, class Traits, class Alloc> |
---|
183 | struct deduce_char_traits< CharT |
---|
184 | , Target |
---|
185 | , std::basic_string<CharT,Traits,Alloc> |
---|
186 | > |
---|
187 | { |
---|
188 | typedef Traits type; |
---|
189 | }; |
---|
190 | |
---|
191 | template<class CharT, class Traits, class Alloc1, class Alloc2> |
---|
192 | struct deduce_char_traits< CharT |
---|
193 | , std::basic_string<CharT,Traits,Alloc1> |
---|
194 | , std::basic_string<CharT,Traits,Alloc2> |
---|
195 | > |
---|
196 | { |
---|
197 | typedef Traits type; |
---|
198 | }; |
---|
199 | #endif |
---|
200 | } |
---|
201 | |
---|
202 | namespace detail // lcast_src_length |
---|
203 | { |
---|
204 | // Return max. length of string representation of Source; |
---|
205 | // 0 if unlimited (with exceptions for some types, see below). |
---|
206 | // Values with limited string representation are placed to |
---|
207 | // the buffer locally defined in lexical_cast function. |
---|
208 | // 1 is returned for few types such as CharT const* or |
---|
209 | // std::basic_string<CharT> that already have an internal |
---|
210 | // buffer ready to be reused by lexical_stream_limited_src. |
---|
211 | // Each specialization should have a correspondent operator<< |
---|
212 | // defined in lexical_stream_limited_src. |
---|
213 | template< class CharT // A result of widest_char transformation. |
---|
214 | , class Source // Source type of lexical_cast. |
---|
215 | > |
---|
216 | struct lcast_src_length |
---|
217 | { |
---|
218 | BOOST_STATIC_CONSTANT(std::size_t, value = 0); |
---|
219 | // To check coverage, build the test with |
---|
220 | // bjam --v2 profile optimization=off |
---|
221 | static void check_coverage() {} |
---|
222 | }; |
---|
223 | |
---|
224 | template<> |
---|
225 | struct lcast_src_length<char, bool> |
---|
226 | { |
---|
227 | BOOST_STATIC_CONSTANT(std::size_t, value = 1); |
---|
228 | static void check_coverage() {} |
---|
229 | }; |
---|
230 | |
---|
231 | template<> |
---|
232 | struct lcast_src_length<char, char> |
---|
233 | { |
---|
234 | BOOST_STATIC_CONSTANT(std::size_t, value = 1); |
---|
235 | static void check_coverage() {} |
---|
236 | }; |
---|
237 | |
---|
238 | // No specializations for: |
---|
239 | // lcast_src_length<char, signed char> |
---|
240 | // lcast_src_length<char, unsigned char> |
---|
241 | // lcast_src_length<char, signed char*> |
---|
242 | // lcast_src_length<char, unsigned char*> |
---|
243 | // lcast_src_length<char, signed char const*> |
---|
244 | // lcast_src_length<char, unsigned char const*> |
---|
245 | |
---|
246 | #ifndef BOOST_LCAST_NO_WCHAR_T |
---|
247 | template<> |
---|
248 | struct lcast_src_length<wchar_t, bool> |
---|
249 | { |
---|
250 | BOOST_STATIC_CONSTANT(std::size_t, value = 1); |
---|
251 | static void check_coverage() {} |
---|
252 | }; |
---|
253 | |
---|
254 | template<> |
---|
255 | struct lcast_src_length<wchar_t, char> |
---|
256 | { |
---|
257 | BOOST_STATIC_CONSTANT(std::size_t, value = 1); |
---|
258 | static void check_coverage() {} |
---|
259 | }; |
---|
260 | |
---|
261 | #ifndef BOOST_NO_INTRINSIC_WCHAR_T |
---|
262 | template<> |
---|
263 | struct lcast_src_length<wchar_t, wchar_t> |
---|
264 | { |
---|
265 | BOOST_STATIC_CONSTANT(std::size_t, value = 1); |
---|
266 | static void check_coverage() {} |
---|
267 | }; |
---|
268 | #endif |
---|
269 | #endif |
---|
270 | |
---|
271 | template<> |
---|
272 | struct lcast_src_length<char, char const*> |
---|
273 | { |
---|
274 | BOOST_STATIC_CONSTANT(std::size_t, value = 1); |
---|
275 | static void check_coverage() {} |
---|
276 | }; |
---|
277 | |
---|
278 | template<> |
---|
279 | struct lcast_src_length<char, char*> |
---|
280 | { |
---|
281 | BOOST_STATIC_CONSTANT(std::size_t, value = 1); |
---|
282 | static void check_coverage() {} |
---|
283 | }; |
---|
284 | |
---|
285 | #ifndef BOOST_LCAST_NO_WCHAR_T |
---|
286 | template<> |
---|
287 | struct lcast_src_length<wchar_t, wchar_t const*> |
---|
288 | { |
---|
289 | BOOST_STATIC_CONSTANT(std::size_t, value = 1); |
---|
290 | static void check_coverage() {} |
---|
291 | }; |
---|
292 | |
---|
293 | template<> |
---|
294 | struct lcast_src_length<wchar_t, wchar_t*> |
---|
295 | { |
---|
296 | BOOST_STATIC_CONSTANT(std::size_t, value = 1); |
---|
297 | static void check_coverage() {} |
---|
298 | }; |
---|
299 | #endif |
---|
300 | |
---|
301 | #ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION |
---|
302 | template<class CharT, class Traits, class Alloc> |
---|
303 | struct lcast_src_length< CharT, std::basic_string<CharT,Traits,Alloc> > |
---|
304 | { |
---|
305 | BOOST_STATIC_CONSTANT(std::size_t, value = 1); |
---|
306 | static void check_coverage() {} |
---|
307 | }; |
---|
308 | #else |
---|
309 | template<> |
---|
310 | struct lcast_src_length< char, std::basic_string<char> > |
---|
311 | { |
---|
312 | BOOST_STATIC_CONSTANT(std::size_t, value = 1); |
---|
313 | static void check_coverage() {} |
---|
314 | }; |
---|
315 | |
---|
316 | #ifndef BOOST_LCAST_NO_WCHAR_T |
---|
317 | template<> |
---|
318 | struct lcast_src_length< wchar_t, std::basic_string<wchar_t> > |
---|
319 | { |
---|
320 | BOOST_STATIC_CONSTANT(std::size_t, value = 1); |
---|
321 | static void check_coverage() {} |
---|
322 | }; |
---|
323 | #endif |
---|
324 | #endif |
---|
325 | |
---|
326 | // Helper for integral types. |
---|
327 | // Notes on length calculation: |
---|
328 | // Max length for 32bit int with grouping "\1" and thousands_sep ',': |
---|
329 | // "-2,1,4,7,4,8,3,6,4,7" |
---|
330 | // ^ - is_signed |
---|
331 | // ^ - 1 digit not counted by digits10 |
---|
332 | // ^^^^^^^^^^^^^^^^^^ - digits10 * 2 |
---|
333 | // |
---|
334 | // Constant is_specialized is used instead of constant 1 |
---|
335 | // to prevent buffer overflow in a rare case when |
---|
336 | // <boost/limits.hpp> doesn't add missing specialization for |
---|
337 | // numeric_limits<T> for some integral type T. |
---|
338 | // When is_specialized is false, the whole expression is 0. |
---|
339 | template<class Source> |
---|
340 | struct lcast_src_length_integral |
---|
341 | { |
---|
342 | #ifndef BOOST_NO_LIMITS_COMPILE_TIME_CONSTANTS |
---|
343 | BOOST_STATIC_CONSTANT(std::size_t, value = |
---|
344 | std::numeric_limits<Source>::is_signed + |
---|
345 | std::numeric_limits<Source>::is_specialized + // == 1 |
---|
346 | std::numeric_limits<Source>::digits10 * 2 |
---|
347 | ); |
---|
348 | #else |
---|
349 | BOOST_STATIC_CONSTANT(std::size_t, value = 156); |
---|
350 | BOOST_STATIC_ASSERT(sizeof(Source) * CHAR_BIT <= 256); |
---|
351 | #endif |
---|
352 | }; |
---|
353 | |
---|
354 | #define BOOST_LCAST_DEF1(CharT, T) \ |
---|
355 | template<> struct lcast_src_length<CharT, T> \ |
---|
356 | : lcast_src_length_integral<T> \ |
---|
357 | { static void check_coverage() {} }; |
---|
358 | |
---|
359 | #ifdef BOOST_LCAST_NO_WCHAR_T |
---|
360 | #define BOOST_LCAST_DEF(T) BOOST_LCAST_DEF1(char, T) |
---|
361 | #else |
---|
362 | #define BOOST_LCAST_DEF(T) \ |
---|
363 | BOOST_LCAST_DEF1(char, T) \ |
---|
364 | BOOST_LCAST_DEF1(wchar_t, T) |
---|
365 | #endif |
---|
366 | |
---|
367 | BOOST_LCAST_DEF(short) |
---|
368 | BOOST_LCAST_DEF(unsigned short) |
---|
369 | BOOST_LCAST_DEF(int) |
---|
370 | BOOST_LCAST_DEF(unsigned int) |
---|
371 | BOOST_LCAST_DEF(long) |
---|
372 | BOOST_LCAST_DEF(unsigned long) |
---|
373 | #if defined(BOOST_HAS_LONG_LONG) |
---|
374 | BOOST_LCAST_DEF(boost::ulong_long_type) |
---|
375 | BOOST_LCAST_DEF(boost::long_long_type ) |
---|
376 | #elif defined(BOOST_HAS_MS_INT64) |
---|
377 | BOOST_LCAST_DEF(unsigned __int64) |
---|
378 | BOOST_LCAST_DEF( __int64) |
---|
379 | #endif |
---|
380 | |
---|
381 | #undef BOOST_LCAST_DEF |
---|
382 | #undef BOOST_LCAST_DEF1 |
---|
383 | |
---|
384 | #ifndef BOOST_LCAST_NO_COMPILE_TIME_PRECISION |
---|
385 | // Helper for floating point types. |
---|
386 | // -1.23456789e-123456 |
---|
387 | // ^ sign |
---|
388 | // ^ leading digit |
---|
389 | // ^ decimal point |
---|
390 | // ^^^^^^^^ lcast_precision<Source>::value |
---|
391 | // ^ "e" |
---|
392 | // ^ exponent sign |
---|
393 | // ^^^^^^ exponent (assumed 6 or less digits) |
---|
394 | // sign + leading digit + decimal point + "e" + exponent sign == 5 |
---|
395 | template<class Source> |
---|
396 | struct lcast_src_length_floating |
---|
397 | { |
---|
398 | BOOST_STATIC_ASSERT( |
---|
399 | std::numeric_limits<Source>::max_exponent10 <= 999999L && |
---|
400 | std::numeric_limits<Source>::min_exponent10 >= -999999L |
---|
401 | ); |
---|
402 | BOOST_STATIC_CONSTANT(std::size_t, value = |
---|
403 | 5 + lcast_precision<Source>::value + 6 |
---|
404 | ); |
---|
405 | }; |
---|
406 | |
---|
407 | template<> |
---|
408 | struct lcast_src_length<char,float> |
---|
409 | : lcast_src_length_floating<float> |
---|
410 | { |
---|
411 | static void check_coverage() {} |
---|
412 | }; |
---|
413 | |
---|
414 | template<> |
---|
415 | struct lcast_src_length<char,double> |
---|
416 | : lcast_src_length_floating<double> |
---|
417 | { |
---|
418 | static void check_coverage() {} |
---|
419 | }; |
---|
420 | |
---|
421 | template<> |
---|
422 | struct lcast_src_length<char,long double> |
---|
423 | : lcast_src_length_floating<long double> |
---|
424 | { |
---|
425 | static void check_coverage() {} |
---|
426 | }; |
---|
427 | |
---|
428 | #ifndef BOOST_LCAST_NO_WCHAR_T |
---|
429 | template<> |
---|
430 | struct lcast_src_length<wchar_t,float> |
---|
431 | : lcast_src_length_floating<float> |
---|
432 | { |
---|
433 | static void check_coverage() {} |
---|
434 | }; |
---|
435 | |
---|
436 | template<> |
---|
437 | struct lcast_src_length<wchar_t,double> |
---|
438 | : lcast_src_length_floating<double> |
---|
439 | { |
---|
440 | static void check_coverage() {} |
---|
441 | }; |
---|
442 | |
---|
443 | template<> |
---|
444 | struct lcast_src_length<wchar_t,long double> |
---|
445 | : lcast_src_length_floating<long double> |
---|
446 | { |
---|
447 | static void check_coverage() {} |
---|
448 | }; |
---|
449 | |
---|
450 | #endif // #ifndef BOOST_LCAST_NO_WCHAR_T |
---|
451 | #endif // #ifndef BOOST_LCAST_NO_COMPILE_TIME_PRECISION |
---|
452 | } |
---|
453 | |
---|
454 | namespace detail // '0' and '-' constants |
---|
455 | { |
---|
456 | template<typename CharT> struct lcast_char_constants; |
---|
457 | |
---|
458 | template<> |
---|
459 | struct lcast_char_constants<char> |
---|
460 | { |
---|
461 | BOOST_STATIC_CONSTANT(char, zero = '0'); |
---|
462 | BOOST_STATIC_CONSTANT(char, minus = '-'); |
---|
463 | }; |
---|
464 | |
---|
465 | #ifndef BOOST_LCAST_NO_WCHAR_T |
---|
466 | template<> |
---|
467 | struct lcast_char_constants<wchar_t> |
---|
468 | { |
---|
469 | BOOST_STATIC_CONSTANT(wchar_t, zero = L'0'); |
---|
470 | BOOST_STATIC_CONSTANT(wchar_t, minus = L'-'); |
---|
471 | }; |
---|
472 | #endif |
---|
473 | } |
---|
474 | |
---|
475 | namespace detail // lexical_streambuf_fake |
---|
476 | { |
---|
477 | struct lexical_streambuf_fake |
---|
478 | { |
---|
479 | }; |
---|
480 | } |
---|
481 | |
---|
482 | namespace detail // lcast_to_unsigned |
---|
483 | { |
---|
484 | #if (defined _MSC_VER) |
---|
485 | # pragma warning( push ) |
---|
486 | // C4146: unary minus operator applied to unsigned type, result still unsigned |
---|
487 | # pragma warning( disable : 4146 ) |
---|
488 | #elif defined( __BORLANDC__ ) |
---|
489 | # pragma option push -w-8041 |
---|
490 | #endif |
---|
491 | template<class T> |
---|
492 | inline |
---|
493 | BOOST_DEDUCED_TYPENAME make_unsigned<T>::type lcast_to_unsigned(T value) |
---|
494 | { |
---|
495 | typedef BOOST_DEDUCED_TYPENAME make_unsigned<T>::type result_type; |
---|
496 | result_type uvalue = static_cast<result_type>(value); |
---|
497 | return value < 0 ? -uvalue : uvalue; |
---|
498 | } |
---|
499 | #if (defined _MSC_VER) |
---|
500 | # pragma warning( pop ) |
---|
501 | #elif defined( __BORLANDC__ ) |
---|
502 | # pragma option pop |
---|
503 | #endif |
---|
504 | } |
---|
505 | |
---|
506 | namespace detail // lcast_put_unsigned |
---|
507 | { |
---|
508 | template<class Traits, class T, class CharT> |
---|
509 | CharT* lcast_put_unsigned(T n, CharT* finish) |
---|
510 | { |
---|
511 | #ifndef BOOST_NO_LIMITS_COMPILE_TIME_CONSTANTS |
---|
512 | BOOST_STATIC_ASSERT(!std::numeric_limits<T>::is_signed); |
---|
513 | #endif |
---|
514 | |
---|
515 | #ifndef BOOST_LEXICAL_CAST_ASSUME_C_LOCALE |
---|
516 | // TODO: use BOOST_NO_STD_LOCALE |
---|
517 | std::locale loc; |
---|
518 | typedef std::numpunct<CharT> numpunct; |
---|
519 | numpunct const& np = BOOST_USE_FACET(numpunct, loc); |
---|
520 | std::string const& grouping = np.grouping(); |
---|
521 | std::string::size_type const grouping_size = grouping.size(); |
---|
522 | CharT thousands_sep = grouping_size ? np.thousands_sep() : 0; |
---|
523 | std::string::size_type group = 0; // current group number |
---|
524 | char last_grp_size = grouping[0] <= 0 ? CHAR_MAX : grouping[0]; |
---|
525 | // a) Since grouping is const, grouping[grouping.size()] returns 0. |
---|
526 | // b) It's safe to assume here and below that CHAR_MAX |
---|
527 | // is equivalent to unlimited grouping: |
---|
528 | #ifndef BOOST_NO_LIMITS_COMPILE_TIME_CONSTANTS |
---|
529 | BOOST_STATIC_ASSERT(std::numeric_limits<T>::digits10 < CHAR_MAX); |
---|
530 | #endif |
---|
531 | |
---|
532 | char left = last_grp_size; |
---|
533 | #endif |
---|
534 | |
---|
535 | typedef typename Traits::int_type int_type; |
---|
536 | CharT const czero = lcast_char_constants<CharT>::zero; |
---|
537 | int_type const zero = Traits::to_int_type(czero); |
---|
538 | |
---|
539 | do |
---|
540 | { |
---|
541 | #ifndef BOOST_LEXICAL_CAST_ASSUME_C_LOCALE |
---|
542 | if(left == 0) |
---|
543 | { |
---|
544 | ++group; |
---|
545 | if(group < grouping_size) |
---|
546 | { |
---|
547 | char const grp_size = grouping[group]; |
---|
548 | last_grp_size = grp_size <= 0 ? CHAR_MAX : grp_size; |
---|
549 | } |
---|
550 | |
---|
551 | left = last_grp_size; |
---|
552 | --finish; |
---|
553 | Traits::assign(*finish, thousands_sep); |
---|
554 | } |
---|
555 | |
---|
556 | --left; |
---|
557 | #endif |
---|
558 | |
---|
559 | --finish; |
---|
560 | int_type const digit = static_cast<int_type>(n % 10U); |
---|
561 | Traits::assign(*finish, Traits::to_char_type(zero + digit)); |
---|
562 | n /= 10; |
---|
563 | } while(n); |
---|
564 | |
---|
565 | return finish; |
---|
566 | } |
---|
567 | } |
---|
568 | |
---|
569 | namespace detail // stream wrapper for handling lexical conversions |
---|
570 | { |
---|
571 | template<typename Target, typename Source, typename Traits> |
---|
572 | class lexical_stream |
---|
573 | { |
---|
574 | private: |
---|
575 | typedef typename widest_char< |
---|
576 | typename stream_char<Target>::type, |
---|
577 | typename stream_char<Source>::type>::type char_type; |
---|
578 | |
---|
579 | typedef Traits traits_type; |
---|
580 | |
---|
581 | public: |
---|
582 | lexical_stream(char_type* = 0, char_type* = 0) |
---|
583 | { |
---|
584 | stream.unsetf(std::ios::skipws); |
---|
585 | lcast_set_precision(stream, static_cast<Source*>(0), static_cast<Target*>(0) ); |
---|
586 | } |
---|
587 | ~lexical_stream() |
---|
588 | { |
---|
589 | #if defined(BOOST_NO_STRINGSTREAM) |
---|
590 | stream.freeze(false); |
---|
591 | #endif |
---|
592 | } |
---|
593 | bool operator<<(const Source &input) |
---|
594 | { |
---|
595 | return !(stream << input).fail(); |
---|
596 | } |
---|
597 | template<typename InputStreamable> |
---|
598 | bool operator>>(InputStreamable &output) |
---|
599 | { |
---|
600 | return !is_pointer<InputStreamable>::value && |
---|
601 | stream >> output && |
---|
602 | stream.get() == |
---|
603 | #if defined(__GNUC__) && (__GNUC__<3) && defined(BOOST_NO_STD_WSTRING) |
---|
604 | // GCC 2.9x lacks std::char_traits<>::eof(). |
---|
605 | // We use BOOST_NO_STD_WSTRING to filter out STLport and libstdc++-v3 |
---|
606 | // configurations, which do provide std::char_traits<>::eof(). |
---|
607 | |
---|
608 | EOF; |
---|
609 | #else |
---|
610 | traits_type::eof(); |
---|
611 | #endif |
---|
612 | } |
---|
613 | |
---|
614 | #ifdef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION |
---|
615 | |
---|
616 | bool operator>>(std::string &output) |
---|
617 | { |
---|
618 | #if defined(BOOST_NO_STRINGSTREAM) |
---|
619 | stream << '\0'; |
---|
620 | #endif |
---|
621 | stream.str().swap(output); |
---|
622 | return true; |
---|
623 | } |
---|
624 | #ifndef BOOST_LCAST_NO_WCHAR_T |
---|
625 | bool operator>>(std::wstring &output) |
---|
626 | { |
---|
627 | stream.str().swap(output); |
---|
628 | return true; |
---|
629 | } |
---|
630 | #endif |
---|
631 | |
---|
632 | #else |
---|
633 | bool operator>>(std::basic_string<char_type,traits_type>& output) |
---|
634 | { |
---|
635 | stream.str().swap(output); |
---|
636 | return true; |
---|
637 | } |
---|
638 | |
---|
639 | template<class Alloc> |
---|
640 | bool operator>>(std::basic_string<char_type,traits_type,Alloc>& out) |
---|
641 | { |
---|
642 | std::basic_string<char_type,traits_type> str(stream.str()); |
---|
643 | out.assign(str.begin(), str.end()); |
---|
644 | return true; |
---|
645 | } |
---|
646 | #endif |
---|
647 | private: |
---|
648 | #if defined(BOOST_NO_STRINGSTREAM) |
---|
649 | std::strstream stream; |
---|
650 | #elif defined(BOOST_NO_STD_LOCALE) |
---|
651 | std::stringstream stream; |
---|
652 | #else |
---|
653 | std::basic_stringstream<char_type,traits_type> stream; |
---|
654 | #endif |
---|
655 | }; |
---|
656 | } |
---|
657 | |
---|
658 | namespace detail // optimized stream wrapper |
---|
659 | { |
---|
660 | // String representation of Source has an upper limit. |
---|
661 | template< class CharT // a result of widest_char transformation |
---|
662 | , class Base // lexical_streambuf_fake or basic_streambuf<CharT> |
---|
663 | , class Traits // usually char_traits<CharT> |
---|
664 | > |
---|
665 | class lexical_stream_limited_src : public Base |
---|
666 | { |
---|
667 | // A string representation of Source is written to [start, finish). |
---|
668 | // Currently, it is assumed that [start, finish) is big enough |
---|
669 | // to hold a string representation of any Source value. |
---|
670 | CharT* start; |
---|
671 | CharT* finish; |
---|
672 | |
---|
673 | private: |
---|
674 | |
---|
675 | static void widen_and_assign(char*p, char ch) |
---|
676 | { |
---|
677 | Traits::assign(*p, ch); |
---|
678 | } |
---|
679 | |
---|
680 | #ifndef BOOST_LCAST_NO_WCHAR_T |
---|
681 | static void widen_and_assign(wchar_t* p, char ch) |
---|
682 | { |
---|
683 | // TODO: use BOOST_NO_STD_LOCALE |
---|
684 | std::locale loc; |
---|
685 | wchar_t w = BOOST_USE_FACET(std::ctype<wchar_t>, loc).widen(ch); |
---|
686 | Traits::assign(*p, w); |
---|
687 | } |
---|
688 | |
---|
689 | static void widen_and_assign(wchar_t* p, wchar_t ch) |
---|
690 | { |
---|
691 | Traits::assign(*p, ch); |
---|
692 | } |
---|
693 | |
---|
694 | static void widen_and_assign(char*, wchar_t ch); // undefined |
---|
695 | #endif |
---|
696 | |
---|
697 | template<class OutputStreamable> |
---|
698 | bool lcast_put(const OutputStreamable& input) |
---|
699 | { |
---|
700 | this->setp(start, finish); |
---|
701 | std::basic_ostream<CharT> stream(static_cast<Base*>(this)); |
---|
702 | lcast_set_precision(stream, static_cast<OutputStreamable*>(0)); |
---|
703 | bool const result = !(stream << input).fail(); |
---|
704 | finish = this->pptr(); |
---|
705 | return result; |
---|
706 | } |
---|
707 | |
---|
708 | // Undefined: |
---|
709 | lexical_stream_limited_src(lexical_stream_limited_src const&); |
---|
710 | void operator=(lexical_stream_limited_src const&); |
---|
711 | |
---|
712 | public: |
---|
713 | |
---|
714 | lexical_stream_limited_src(CharT* sta, CharT* fin) |
---|
715 | : start(sta) |
---|
716 | , finish(fin) |
---|
717 | {} |
---|
718 | |
---|
719 | public: // output |
---|
720 | |
---|
721 | template<class Alloc> |
---|
722 | bool operator<<(std::basic_string<CharT,Traits,Alloc> const& str) |
---|
723 | { |
---|
724 | start = const_cast<CharT*>(str.data()); |
---|
725 | finish = start + str.length(); |
---|
726 | return true; |
---|
727 | } |
---|
728 | |
---|
729 | bool operator<<(bool); |
---|
730 | bool operator<<(char); |
---|
731 | #if !defined(BOOST_LCAST_NO_WCHAR_T) && !defined(BOOST_NO_INTRINSIC_WCHAR_T) |
---|
732 | bool operator<<(wchar_t); |
---|
733 | #endif |
---|
734 | bool operator<<(CharT const*); |
---|
735 | bool operator<<(short); |
---|
736 | bool operator<<(int); |
---|
737 | bool operator<<(long); |
---|
738 | bool operator<<(unsigned short); |
---|
739 | bool operator<<(unsigned int); |
---|
740 | bool operator<<(unsigned long); |
---|
741 | #if defined(BOOST_HAS_LONG_LONG) |
---|
742 | bool operator<<(boost::ulong_long_type); |
---|
743 | bool operator<<(boost::long_long_type ); |
---|
744 | #elif defined(BOOST_HAS_MS_INT64) |
---|
745 | bool operator<<(unsigned __int64); |
---|
746 | bool operator<<( __int64); |
---|
747 | #endif |
---|
748 | // These three operators use ostream and streambuf. |
---|
749 | // lcast_streambuf_for_source<T>::value is true. |
---|
750 | bool operator<<(float); |
---|
751 | bool operator<<(double); |
---|
752 | bool operator<<(long double); |
---|
753 | |
---|
754 | public: // input |
---|
755 | |
---|
756 | // Generic istream-based algorithm. |
---|
757 | // lcast_streambuf_for_target<InputStreamable>::value is true. |
---|
758 | template<typename InputStreamable> |
---|
759 | bool operator>>(InputStreamable& output) |
---|
760 | { |
---|
761 | #if (defined _MSC_VER) |
---|
762 | # pragma warning( push ) |
---|
763 | // conditional expression is constant |
---|
764 | # pragma warning( disable : 4127 ) |
---|
765 | #endif |
---|
766 | if(is_pointer<InputStreamable>::value) |
---|
767 | return false; |
---|
768 | |
---|
769 | this->setg(start, start, finish); |
---|
770 | std::basic_istream<CharT> stream(static_cast<Base*>(this)); |
---|
771 | stream.unsetf(std::ios::skipws); |
---|
772 | lcast_set_precision(stream, static_cast<InputStreamable*>(0)); |
---|
773 | #if (defined _MSC_VER) |
---|
774 | # pragma warning( pop ) |
---|
775 | #endif |
---|
776 | return stream >> output && |
---|
777 | stream.get() == |
---|
778 | #if defined(__GNUC__) && (__GNUC__<3) && defined(BOOST_NO_STD_WSTRING) |
---|
779 | // GCC 2.9x lacks std::char_traits<>::eof(). |
---|
780 | // We use BOOST_NO_STD_WSTRING to filter out STLport and libstdc++-v3 |
---|
781 | // configurations, which do provide std::char_traits<>::eof(). |
---|
782 | |
---|
783 | EOF; |
---|
784 | #else |
---|
785 | Traits::eof(); |
---|
786 | #endif |
---|
787 | } |
---|
788 | |
---|
789 | bool operator>>(CharT&); |
---|
790 | |
---|
791 | #ifdef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION |
---|
792 | // This #if is in sync with lcast_streambuf_for_target |
---|
793 | |
---|
794 | bool operator>>(std::string&); |
---|
795 | |
---|
796 | #ifndef BOOST_LCAST_NO_WCHAR_T |
---|
797 | bool operator>>(std::wstring&); |
---|
798 | #endif |
---|
799 | |
---|
800 | #else |
---|
801 | template<class Alloc> |
---|
802 | bool operator>>(std::basic_string<CharT,Traits,Alloc>& str) |
---|
803 | { |
---|
804 | str.assign(start, finish); |
---|
805 | return true; |
---|
806 | } |
---|
807 | #endif |
---|
808 | }; |
---|
809 | |
---|
810 | template<typename CharT, class Base, class Traits> |
---|
811 | inline bool lexical_stream_limited_src<CharT,Base,Traits>::operator<<( |
---|
812 | bool value) |
---|
813 | { |
---|
814 | typedef typename Traits::int_type int_type; |
---|
815 | CharT const czero = lcast_char_constants<CharT>::zero; |
---|
816 | int_type const zero = Traits::to_int_type(czero); |
---|
817 | Traits::assign(*start, Traits::to_char_type(zero + value)); |
---|
818 | finish = start + 1; |
---|
819 | return true; |
---|
820 | } |
---|
821 | |
---|
822 | template<typename CharT, class Base, class Traits> |
---|
823 | inline bool lexical_stream_limited_src<CharT,Base,Traits>::operator<<( |
---|
824 | char ch) |
---|
825 | { |
---|
826 | widen_and_assign(start, ch); |
---|
827 | finish = start + 1; |
---|
828 | return true; |
---|
829 | } |
---|
830 | |
---|
831 | #if !defined(BOOST_LCAST_NO_WCHAR_T) && !defined(BOOST_NO_INTRINSIC_WCHAR_T) |
---|
832 | template<typename CharT, class Base, class Traits> |
---|
833 | inline bool lexical_stream_limited_src<CharT,Base,Traits>::operator<<( |
---|
834 | wchar_t ch) |
---|
835 | { |
---|
836 | widen_and_assign(start, ch); |
---|
837 | finish = start + 1; |
---|
838 | return true; |
---|
839 | } |
---|
840 | #endif |
---|
841 | |
---|
842 | template<typename CharT, class Base, class Traits> |
---|
843 | inline bool lexical_stream_limited_src<CharT,Base,Traits>::operator<<( |
---|
844 | short n) |
---|
845 | { |
---|
846 | start = lcast_put_unsigned<Traits>(lcast_to_unsigned(n), finish); |
---|
847 | if(n < 0) |
---|
848 | { |
---|
849 | --start; |
---|
850 | CharT const minus = lcast_char_constants<CharT>::minus; |
---|
851 | Traits::assign(*start, minus); |
---|
852 | } |
---|
853 | return true; |
---|
854 | } |
---|
855 | |
---|
856 | template<typename CharT, class Base, class Traits> |
---|
857 | inline bool lexical_stream_limited_src<CharT,Base,Traits>::operator<<( |
---|
858 | int n) |
---|
859 | { |
---|
860 | start = lcast_put_unsigned<Traits>(lcast_to_unsigned(n), finish); |
---|
861 | if(n < 0) |
---|
862 | { |
---|
863 | --start; |
---|
864 | CharT const minus = lcast_char_constants<CharT>::minus; |
---|
865 | Traits::assign(*start, minus); |
---|
866 | } |
---|
867 | return true; |
---|
868 | } |
---|
869 | |
---|
870 | template<typename CharT, class Base, class Traits> |
---|
871 | inline bool lexical_stream_limited_src<CharT,Base,Traits>::operator<<( |
---|
872 | long n) |
---|
873 | { |
---|
874 | start = lcast_put_unsigned<Traits>(lcast_to_unsigned(n), finish); |
---|
875 | if(n < 0) |
---|
876 | { |
---|
877 | --start; |
---|
878 | CharT const minus = lcast_char_constants<CharT>::minus; |
---|
879 | Traits::assign(*start, minus); |
---|
880 | } |
---|
881 | return true; |
---|
882 | } |
---|
883 | |
---|
884 | #if defined(BOOST_HAS_LONG_LONG) |
---|
885 | template<typename CharT, class Base, class Traits> |
---|
886 | inline bool lexical_stream_limited_src<CharT,Base,Traits>::operator<<( |
---|
887 | boost::long_long_type n) |
---|
888 | { |
---|
889 | start = lcast_put_unsigned<Traits>(lcast_to_unsigned(n), finish); |
---|
890 | if(n < 0) |
---|
891 | { |
---|
892 | --start; |
---|
893 | CharT const minus = lcast_char_constants<CharT>::minus; |
---|
894 | Traits::assign(*start, minus); |
---|
895 | } |
---|
896 | return true; |
---|
897 | } |
---|
898 | #elif defined(BOOST_HAS_MS_INT64) |
---|
899 | template<typename CharT, class Base, class Traits> |
---|
900 | inline bool lexical_stream_limited_src<CharT,Base,Traits>::operator<<( |
---|
901 | __int64 n) |
---|
902 | { |
---|
903 | start = lcast_put_unsigned<Traits>(lcast_to_unsigned(n), finish); |
---|
904 | if(n < 0) |
---|
905 | { |
---|
906 | --start; |
---|
907 | CharT const minus = lcast_char_constants<CharT>::minus; |
---|
908 | Traits::assign(*start, minus); |
---|
909 | } |
---|
910 | return true; |
---|
911 | } |
---|
912 | #endif |
---|
913 | |
---|
914 | template<typename CharT, class Base, class Traits> |
---|
915 | inline bool lexical_stream_limited_src<CharT,Base,Traits>::operator<<( |
---|
916 | unsigned short n) |
---|
917 | { |
---|
918 | start = lcast_put_unsigned<Traits>(n, finish); |
---|
919 | return true; |
---|
920 | } |
---|
921 | |
---|
922 | template<typename CharT, class Base, class Traits> |
---|
923 | inline bool lexical_stream_limited_src<CharT,Base,Traits>::operator<<( |
---|
924 | unsigned int n) |
---|
925 | { |
---|
926 | start = lcast_put_unsigned<Traits>(n, finish); |
---|
927 | return true; |
---|
928 | } |
---|
929 | |
---|
930 | template<typename CharT, class Base, class Traits> |
---|
931 | inline bool lexical_stream_limited_src<CharT,Base,Traits>::operator<<( |
---|
932 | unsigned long n) |
---|
933 | { |
---|
934 | start = lcast_put_unsigned<Traits>(n, finish); |
---|
935 | return true; |
---|
936 | } |
---|
937 | |
---|
938 | #if defined(BOOST_HAS_LONG_LONG) |
---|
939 | template<typename CharT, class Base, class Traits> |
---|
940 | inline bool lexical_stream_limited_src<CharT,Base,Traits>::operator<<( |
---|
941 | boost::ulong_long_type n) |
---|
942 | { |
---|
943 | start = lcast_put_unsigned<Traits>(n, finish); |
---|
944 | return true; |
---|
945 | } |
---|
946 | #elif defined(BOOST_HAS_MS_INT64) |
---|
947 | template<typename CharT, class Base, class Traits> |
---|
948 | inline bool lexical_stream_limited_src<CharT,Base,Traits>::operator<<( |
---|
949 | unsigned __int64 n) |
---|
950 | { |
---|
951 | start = lcast_put_unsigned<Traits>(n, finish); |
---|
952 | return true; |
---|
953 | } |
---|
954 | #endif |
---|
955 | |
---|
956 | template<typename CharT, class Base, class Traits> |
---|
957 | inline bool lexical_stream_limited_src<CharT,Base,Traits>::operator<<( |
---|
958 | float val) |
---|
959 | { |
---|
960 | return this->lcast_put(val); |
---|
961 | } |
---|
962 | |
---|
963 | template<typename CharT, class Base, class Traits> |
---|
964 | inline bool lexical_stream_limited_src<CharT,Base,Traits>::operator<<( |
---|
965 | double val) |
---|
966 | { |
---|
967 | return this->lcast_put(val); |
---|
968 | } |
---|
969 | |
---|
970 | template<typename CharT, class Base, class Traits> |
---|
971 | inline bool lexical_stream_limited_src<CharT,Base,Traits>::operator<<( |
---|
972 | long double val) |
---|
973 | { |
---|
974 | return this->lcast_put(val); |
---|
975 | } |
---|
976 | |
---|
977 | template<typename CharT, class Base, class Traits> |
---|
978 | inline bool lexical_stream_limited_src<CharT,Base,Traits>::operator<<( |
---|
979 | CharT const* str) |
---|
980 | { |
---|
981 | start = const_cast<CharT*>(str); |
---|
982 | finish = start + Traits::length(str); |
---|
983 | return true; |
---|
984 | } |
---|
985 | |
---|
986 | template<typename CharT, class Base, class Traits> |
---|
987 | inline bool lexical_stream_limited_src<CharT,Base,Traits>::operator>>( |
---|
988 | CharT& output) |
---|
989 | { |
---|
990 | bool const ok = (finish - start == 1); |
---|
991 | if(ok) |
---|
992 | Traits::assign(output, *start); |
---|
993 | return ok; |
---|
994 | } |
---|
995 | |
---|
996 | #ifdef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION |
---|
997 | template<typename CharT, class Base, class Traits> |
---|
998 | inline bool lexical_stream_limited_src<CharT,Base,Traits>::operator>>( |
---|
999 | std::string& str) |
---|
1000 | { |
---|
1001 | str.assign(start, finish); |
---|
1002 | return true; |
---|
1003 | } |
---|
1004 | |
---|
1005 | #ifndef BOOST_LCAST_NO_WCHAR_T |
---|
1006 | template<typename CharT, class Base, class Traits> |
---|
1007 | inline bool lexical_stream_limited_src<CharT,Base,Traits>::operator>>( |
---|
1008 | std::wstring& str) |
---|
1009 | { |
---|
1010 | str.assign(start, finish); |
---|
1011 | return true; |
---|
1012 | } |
---|
1013 | #endif |
---|
1014 | #endif |
---|
1015 | } |
---|
1016 | |
---|
1017 | namespace detail // lcast_streambuf_for_source |
---|
1018 | { |
---|
1019 | // Returns true if optimized stream wrapper needs ostream for writing. |
---|
1020 | template<class Source> |
---|
1021 | struct lcast_streambuf_for_source |
---|
1022 | { |
---|
1023 | BOOST_STATIC_CONSTANT(bool, value = false); |
---|
1024 | }; |
---|
1025 | |
---|
1026 | template<> |
---|
1027 | struct lcast_streambuf_for_source<float> |
---|
1028 | { |
---|
1029 | BOOST_STATIC_CONSTANT(bool, value = true); |
---|
1030 | }; |
---|
1031 | |
---|
1032 | template<> |
---|
1033 | struct lcast_streambuf_for_source<double> |
---|
1034 | { |
---|
1035 | BOOST_STATIC_CONSTANT(bool, value = true); |
---|
1036 | }; |
---|
1037 | |
---|
1038 | template<> |
---|
1039 | struct lcast_streambuf_for_source<long double> |
---|
1040 | { |
---|
1041 | BOOST_STATIC_CONSTANT(bool, value = true); |
---|
1042 | }; |
---|
1043 | } |
---|
1044 | |
---|
1045 | namespace detail // lcast_streambuf_for_target |
---|
1046 | { |
---|
1047 | // Returns true if optimized stream wrapper needs istream for reading. |
---|
1048 | template<class Target> |
---|
1049 | struct lcast_streambuf_for_target |
---|
1050 | { |
---|
1051 | BOOST_STATIC_CONSTANT(bool, value = true); |
---|
1052 | }; |
---|
1053 | |
---|
1054 | template<> |
---|
1055 | struct lcast_streambuf_for_target<char> |
---|
1056 | { |
---|
1057 | BOOST_STATIC_CONSTANT(bool, value = false); |
---|
1058 | }; |
---|
1059 | |
---|
1060 | #if !defined(BOOST_LCAST_NO_WCHAR_T) && !defined(BOOST_NO_INTRINSIC_WCHAR_T) |
---|
1061 | template<> |
---|
1062 | struct lcast_streambuf_for_target<wchar_t> |
---|
1063 | { |
---|
1064 | BOOST_STATIC_CONSTANT(bool, value = false); |
---|
1065 | }; |
---|
1066 | #endif |
---|
1067 | |
---|
1068 | #ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION |
---|
1069 | template<class Traits, class Alloc> |
---|
1070 | struct lcast_streambuf_for_target< |
---|
1071 | std::basic_string<char,Traits,Alloc> > |
---|
1072 | { |
---|
1073 | BOOST_STATIC_CONSTANT(bool, value = false); |
---|
1074 | }; |
---|
1075 | |
---|
1076 | #ifndef BOOST_LCAST_NO_WCHAR_T |
---|
1077 | template<class Traits, class Alloc> |
---|
1078 | struct lcast_streambuf_for_target< |
---|
1079 | std::basic_string<wchar_t,Traits,Alloc> > |
---|
1080 | { |
---|
1081 | BOOST_STATIC_CONSTANT(bool, value = false); |
---|
1082 | }; |
---|
1083 | #endif |
---|
1084 | #else |
---|
1085 | template<> |
---|
1086 | struct lcast_streambuf_for_target<std::string> |
---|
1087 | { |
---|
1088 | BOOST_STATIC_CONSTANT(bool, value = false); |
---|
1089 | }; |
---|
1090 | |
---|
1091 | #ifndef BOOST_LCAST_NO_WCHAR_T |
---|
1092 | template<> |
---|
1093 | struct lcast_streambuf_for_target<std::wstring> |
---|
1094 | { |
---|
1095 | BOOST_STATIC_CONSTANT(bool, value = false); |
---|
1096 | }; |
---|
1097 | #endif |
---|
1098 | #endif |
---|
1099 | } |
---|
1100 | |
---|
1101 | #ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION |
---|
1102 | |
---|
1103 | // call-by-const reference version |
---|
1104 | |
---|
1105 | namespace detail |
---|
1106 | { |
---|
1107 | template<class T> |
---|
1108 | struct array_to_pointer_decay |
---|
1109 | { |
---|
1110 | typedef T type; |
---|
1111 | }; |
---|
1112 | |
---|
1113 | template<class T, std::size_t N> |
---|
1114 | struct array_to_pointer_decay<T[N]> |
---|
1115 | { |
---|
1116 | typedef const T * type; |
---|
1117 | }; |
---|
1118 | |
---|
1119 | #if (defined _MSC_VER) |
---|
1120 | # pragma warning( push ) |
---|
1121 | # pragma warning( disable : 4701 ) // possible use of ... before initialization |
---|
1122 | # pragma warning( disable : 4702 ) // unreachable code |
---|
1123 | #endif |
---|
1124 | |
---|
1125 | template< typename Target |
---|
1126 | , typename Source |
---|
1127 | , bool Unlimited // string representation of Source is unlimited |
---|
1128 | , typename CharT |
---|
1129 | > |
---|
1130 | Target lexical_cast( |
---|
1131 | BOOST_DEDUCED_TYPENAME boost::call_traits<Source>::param_type arg, |
---|
1132 | CharT* buf, std::size_t src_len) |
---|
1133 | { |
---|
1134 | typedef BOOST_DEDUCED_TYPENAME |
---|
1135 | deduce_char_traits<CharT,Target,Source>::type traits; |
---|
1136 | |
---|
1137 | typedef BOOST_DEDUCED_TYPENAME boost::mpl::if_c< |
---|
1138 | lcast_streambuf_for_target<Target>::value || |
---|
1139 | lcast_streambuf_for_source<Source>::value |
---|
1140 | , std::basic_streambuf<CharT> |
---|
1141 | , lexical_streambuf_fake |
---|
1142 | >::type base; |
---|
1143 | |
---|
1144 | BOOST_DEDUCED_TYPENAME boost::mpl::if_c< |
---|
1145 | Unlimited |
---|
1146 | , detail::lexical_stream<Target,Source,traits> |
---|
1147 | , detail::lexical_stream_limited_src<CharT,base,traits> |
---|
1148 | >::type interpreter(buf, buf + src_len); |
---|
1149 | |
---|
1150 | Target result; |
---|
1151 | if(!(interpreter << arg && interpreter >> result)) |
---|
1152 | BOOST_LCAST_THROW_BAD_CAST(Source, Target); |
---|
1153 | return result; |
---|
1154 | } |
---|
1155 | #if (defined _MSC_VER) |
---|
1156 | # pragma warning( pop ) |
---|
1157 | #endif |
---|
1158 | } |
---|
1159 | |
---|
1160 | template<typename Target, typename Source> |
---|
1161 | inline Target lexical_cast(const Source &arg) |
---|
1162 | { |
---|
1163 | typedef typename detail::array_to_pointer_decay<Source>::type src; |
---|
1164 | |
---|
1165 | typedef typename detail::widest_char< |
---|
1166 | typename detail::stream_char<Target>::type |
---|
1167 | , typename detail::stream_char<src>::type |
---|
1168 | >::type char_type; |
---|
1169 | |
---|
1170 | typedef detail::lcast_src_length<char_type, src> lcast_src_length; |
---|
1171 | std::size_t const src_len = lcast_src_length::value; |
---|
1172 | char_type buf[src_len + 1]; |
---|
1173 | lcast_src_length::check_coverage(); |
---|
1174 | return detail::lexical_cast<Target, src, !src_len>(arg, buf, src_len); |
---|
1175 | } |
---|
1176 | |
---|
1177 | #else |
---|
1178 | |
---|
1179 | // call-by-value fallback version (deprecated) |
---|
1180 | |
---|
1181 | template<typename Target, typename Source> |
---|
1182 | Target lexical_cast(Source arg) |
---|
1183 | { |
---|
1184 | typedef typename detail::widest_char< |
---|
1185 | BOOST_DEDUCED_TYPENAME detail::stream_char<Target>::type |
---|
1186 | , BOOST_DEDUCED_TYPENAME detail::stream_char<Source>::type |
---|
1187 | >::type char_type; |
---|
1188 | |
---|
1189 | typedef std::char_traits<char_type> traits; |
---|
1190 | detail::lexical_stream<Target, Source, traits> interpreter; |
---|
1191 | Target result; |
---|
1192 | |
---|
1193 | if(!(interpreter << arg && interpreter >> result)) |
---|
1194 | #ifndef BOOST_NO_TYPEID |
---|
1195 | throw_exception(bad_lexical_cast(typeid(Source), typeid(Target))); |
---|
1196 | #else |
---|
1197 | throw_exception(bad_lexical_cast()); |
---|
1198 | #endif |
---|
1199 | return result; |
---|
1200 | } |
---|
1201 | |
---|
1202 | #endif |
---|
1203 | } |
---|
1204 | |
---|
1205 | // Copyright Kevlin Henney, 2000-2005. |
---|
1206 | // Copyright Alexander Nasonov, 2006-2007. |
---|
1207 | // |
---|
1208 | // Distributed under the Boost Software License, Version 1.0. (See |
---|
1209 | // accompanying file LICENSE_1_0.txt or copy at |
---|
1210 | // http://www.boost.org/LICENSE_1_0.txt) |
---|
1211 | |
---|
1212 | #undef BOOST_LCAST_NO_WCHAR_T |
---|
1213 | #endif |
---|