path.hpp 54.1 KB
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502
//  filesystem path.hpp  ---------------------------------------------------------------//

//  Copyright Vladimir Prus 2002
//  Copyright Beman Dawes 2002-2005, 2009
//  Copyright Andrey Semashev 2021

//  Distributed under the Boost Software License, Version 1.0.
//  See http://www.boost.org/LICENSE_1_0.txt

//  Library home page: http://www.boost.org/libs/filesystem

//  path::stem(), extension(), and replace_extension() are based on
//  basename(), extension(), and change_extension() from the original
//  filesystem/convenience.hpp header by Vladimir Prus.

#ifndef BOOST_FILESYSTEM_PATH_HPP
#define BOOST_FILESYSTEM_PATH_HPP

#include <boost/assert.hpp>
#include <boost/filesystem/config.hpp>
#include <boost/filesystem/detail/path_traits.hpp>
#include <boost/iterator/iterator_facade.hpp>
#include <boost/iterator/iterator_categories.hpp>
#include <boost/core/enable_if.hpp>
#include <boost/io/quoted.hpp>
#include <boost/functional/hash_fwd.hpp>
#include <boost/type_traits/negation.hpp>
#include <boost/type_traits/conjunction.hpp>
#include <boost/type_traits/disjunction.hpp>
#include <boost/type_traits/is_same.hpp>
#include <boost/type_traits/remove_cv.hpp>
#include <cstddef>
#include <iosfwd>
#include <locale>
#include <string>
#include <iterator>
#if !defined(BOOST_NO_CXX17_HDR_STRING_VIEW)
#include <string_view>
#endif

#include <boost/filesystem/detail/header.hpp> // must be the last #include

namespace boost {
namespace filesystem {

namespace path_detail { // intentionally don't use filesystem::detail to not bring internal Boost.Filesystem functions into ADL via path_constants

template< typename Char, Char Separator, Char PreferredSeparator, Char Dot >
struct path_constants
{
    typedef path_constants< Char, Separator, PreferredSeparator, Dot > path_constants_base;
    typedef Char value_type;
    static BOOST_CONSTEXPR_OR_CONST value_type separator = Separator;
    static BOOST_CONSTEXPR_OR_CONST value_type preferred_separator = PreferredSeparator;
    static BOOST_CONSTEXPR_OR_CONST value_type dot = Dot;
};

#if defined(BOOST_NO_CXX17_INLINE_VARIABLES)
template< typename Char, Char Separator, Char PreferredSeparator, Char Dot >
BOOST_CONSTEXPR_OR_CONST typename path_constants< Char, Separator, PreferredSeparator, Dot >::value_type
path_constants< Char, Separator, PreferredSeparator, Dot >::separator;
template< typename Char, Char Separator, Char PreferredSeparator, Char Dot >
BOOST_CONSTEXPR_OR_CONST typename path_constants< Char, Separator, PreferredSeparator, Dot >::value_type
path_constants< Char, Separator, PreferredSeparator, Dot >::preferred_separator;
template< typename Char, Char Separator, Char PreferredSeparator, Char Dot >
BOOST_CONSTEXPR_OR_CONST typename path_constants< Char, Separator, PreferredSeparator, Dot >::value_type
path_constants< Char, Separator, PreferredSeparator, Dot >::dot;
#endif

// A struct that denotes a contiguous range of characters in a string. A lightweight alternative to string_view.
struct substring
{
    std::size_t pos;
    std::size_t size;
};

} // namespace path_detail

//------------------------------------------------------------------------------------//
//                                                                                    //
//                                    class path                                      //
//                                                                                    //
//------------------------------------------------------------------------------------//

class path :
    public filesystem::path_detail::path_constants<
#ifdef BOOST_WINDOWS_API
        detail::path_traits::path_native_char_type, L'/', L'\\', L'.'
#else
        detail::path_traits::path_native_char_type, '/', '/', '.'
#endif
    >
{
public:
    //  value_type is the character type used by the operating system API to
    //  represent paths.

    typedef path_constants_base::value_type value_type;
    typedef std::basic_string< value_type > string_type;
    typedef detail::path_traits::codecvt_type codecvt_type;

    //  ----- character encoding conversions -----

    //  Following the principle of least astonishment, path input arguments
    //  passed to or obtained from the operating system via objects of
    //  class path behave as if they were directly passed to or
    //  obtained from the O/S API, unless conversion is explicitly requested.
    //
    //  POSIX specfies that path strings are passed unchanged to and from the
    //  API. Note that this is different from the POSIX command line utilities,
    //  which convert according to a locale.
    //
    //  Thus for POSIX, char strings do not undergo conversion.  wchar_t strings
    //  are converted to/from char using the path locale or, if a conversion
    //  argument is given, using a conversion object modeled on
    //  std::wstring_convert.
    //
    //  The path locale, which is global to the thread, can be changed by the
    //  imbue() function. It is initialized to an implementation defined locale.
    //
    //  For Windows, wchar_t strings do not undergo conversion. char strings
    //  are converted using the "ANSI" or "OEM" code pages, as determined by
    //  the AreFileApisANSI() function, or, if a conversion argument is given,
    //  using a conversion object modeled on std::wstring_convert.
    //
    //  See m_pathname comments for further important rationale.

    //  TODO: rules needed for operating systems that use / or .
    //  differently, or format directory paths differently from file paths.
    //
    //  **********************************************************************************
    //
    //  More work needed: How to handle an operating system that may have
    //  slash characters or dot characters in valid filenames, either because
    //  it doesn't follow the POSIX standard, or because it allows MBCS
    //  filename encodings that may contain slash or dot characters. For
    //  example, ISO/IEC 2022 (JIS) encoding which allows switching to
    //  JIS x0208-1983 encoding. A valid filename in this set of encodings is
    //  0x1B 0x24 0x42 [switch to X0208-1983] 0x24 0x2F [U+304F Kiragana letter KU]
    //                                             ^^^^
    //  Note that 0x2F is the ASCII slash character
    //
    //  **********************************************************************************

    //  Supported source arguments: half-open iterator range, container, c-array,
    //  and single pointer to null terminated string.

    //  All source arguments except pointers to null terminated byte strings support
    //  multi-byte character strings which may have embedded nulls. Embedded null
    //  support is required for some Asian languages on Windows.

    //  "const codecvt_type& cvt=codecvt()" default arguments are not used because this
    //  limits the impact of locale("") initialization failures on POSIX systems to programs
    //  that actually depend on locale(""). It further ensures that exceptions thrown
    //  as a result of such failues occur after main() has started, so can be caught.

private:
    //! Assignment operation
    class assign_op
    {
    private:
        path& m_self;

    public:
        typedef void result_type;

        explicit assign_op(path& self) BOOST_NOEXCEPT : m_self(self) {}

        result_type operator() (const value_type* source, const value_type* source_end, const codecvt_type* = NULL) const
        {
            m_self.m_pathname.assign(source, source_end);
        }

        template< typename OtherChar >
        result_type operator() (const OtherChar* source, const OtherChar* source_end, const codecvt_type* cvt = NULL) const
        {
            m_self.m_pathname.clear();
            detail::path_traits::convert(source, source_end, m_self.m_pathname, cvt);
        }
    };

    //! Concatenation operation
    class concat_op
    {
    private:
        path& m_self;

    public:
        typedef void result_type;

        explicit concat_op(path& self) BOOST_NOEXCEPT : m_self(self) {}

        result_type operator() (const value_type* source, const value_type* source_end, const codecvt_type* = NULL) const
        {
            m_self.m_pathname.append(source, source_end);
        }

        template< typename OtherChar >
        result_type operator() (const OtherChar* source, const OtherChar* source_end, const codecvt_type* cvt = NULL) const
        {
            detail::path_traits::convert(source, source_end, m_self.m_pathname, cvt);
        }
    };

    //! Path appending operation
    class append_op
    {
    private:
        path& m_self;

    public:
        typedef void result_type;

        explicit append_op(path& self) BOOST_NOEXCEPT : m_self(self) {}

        BOOST_FORCEINLINE result_type operator() (const value_type* source, const value_type* source_end, const codecvt_type* = NULL) const
        {
            m_self.append(source, source_end);
        }

        template< typename OtherChar >
        BOOST_FORCEINLINE result_type operator() (const OtherChar* source, const OtherChar* source_end, const codecvt_type* cvt = NULL) const
        {
            string_type src;
            detail::path_traits::convert(source, source_end, src, cvt);
            m_self.append(src.data(), src.data() + src.size());
        }
    };

public:
    class iterator;
    friend class iterator;
    typedef iterator const_iterator;
    class reverse_iterator;
    typedef reverse_iterator const_reverse_iterator;

public:
    //  -----  constructors  -----

    path() BOOST_NOEXCEPT {}
    path(path const& p) : m_pathname(p.m_pathname) {}
    path(path const& p, codecvt_type const&) : m_pathname(p.m_pathname) {}

    path(const value_type* s) : m_pathname(s) {}
    path(const value_type* s, codecvt_type const&) : m_pathname(s) {}
    path(string_type const& s) : m_pathname(s) {}
    path(string_type const& s, codecvt_type const&) : m_pathname(s) {}
#if !defined(BOOST_NO_CXX17_HDR_STRING_VIEW)
    path(std::basic_string_view< value_type > const& s) : m_pathname(s) {}
    path(std::basic_string_view< value_type > const& s, codecvt_type const&) : m_pathname(s) {}
#endif

#if !defined(BOOST_NO_CXX11_FUNCTION_TEMPLATE_DEFAULT_ARGS)
    template<
        typename Source,
        typename = typename boost::enable_if_c<
            boost::conjunction<
                boost::disjunction<
                    detail::path_traits::is_path_source< typename boost::remove_cv< Source >::type >,
                    detail::path_traits::is_convertible_to_path_source< typename boost::remove_cv< Source >::type >
                >,
                boost::negation< detail::path_traits::is_native_path_source< typename boost::remove_cv< Source >::type > >
            >::value
        >::type
    >
    path(Source const& source)
#else
    template< typename Source >
    path(Source const& source, typename boost::enable_if_c<
        boost::conjunction<
            boost::disjunction<
                detail::path_traits::is_path_source< typename boost::remove_cv< Source >::type >,
                detail::path_traits::is_convertible_to_path_source< typename boost::remove_cv< Source >::type >
            >,
            boost::negation< detail::path_traits::is_native_path_source< typename boost::remove_cv< Source >::type > >
        >::value
    >::type* = NULL)
#endif
    {
        assign(source);
    }

#if !defined(BOOST_NO_CXX11_FUNCTION_TEMPLATE_DEFAULT_ARGS)
    template<
        typename Source,
        typename = typename boost::enable_if_c<
            boost::conjunction<
                boost::disjunction<
                    detail::path_traits::is_path_source< typename boost::remove_cv< Source >::type >,
                    detail::path_traits::is_convertible_to_path_source< typename boost::remove_cv< Source >::type >
                >,
                boost::negation< detail::path_traits::is_native_path_source< typename boost::remove_cv< Source >::type > >
            >::value
        >::type
    >
    path(Source const& source, codecvt_type const& cvt)
#else
    template< typename Source >
    path(Source const& source, codecvt_type const& cvt, typename boost::enable_if_c<
        boost::conjunction<
            boost::disjunction<
                detail::path_traits::is_path_source< typename boost::remove_cv< Source >::type >,
                detail::path_traits::is_convertible_to_path_source< typename boost::remove_cv< Source >::type >
            >,
            boost::negation< detail::path_traits::is_native_path_source< typename boost::remove_cv< Source >::type > >
        >::value
    >::type* = NULL)
#endif
    {
        assign(source, cvt);
    }

    //  As of October 2015 the interaction between noexcept and =default is so troublesome
    //  for VC++, GCC, and probably other compilers, that =default is not used with noexcept
    //  functions. GCC is not even consistent for the same release on different platforms.

#if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
    path(path&& p) BOOST_NOEXCEPT : m_pathname(static_cast< string_type&& >(p.m_pathname))
    {
    }
    path(path&& p, codecvt_type const&) BOOST_NOEXCEPT : m_pathname(static_cast< string_type&& >(p.m_pathname))
    {
    }
    path& operator=(path&& p) BOOST_NOEXCEPT
    {
        m_pathname = static_cast< string_type&& >(p.m_pathname);
        return *this;
    }
    path& assign(path&& p) BOOST_NOEXCEPT
    {
        m_pathname = static_cast< string_type&& >(p.m_pathname);
        return *this;
    }
    path& assign(path&& p, codecvt_type const&) BOOST_NOEXCEPT
    {
        m_pathname = static_cast< string_type&& >(p.m_pathname);
        return *this;
    }

    path(string_type&& s) BOOST_NOEXCEPT : m_pathname(static_cast< string_type&& >(s))
    {
    }
    path(string_type&& s, codecvt_type const&) BOOST_NOEXCEPT : m_pathname(static_cast< string_type&& >(s))
    {
    }
    path& operator=(string_type&& p) BOOST_NOEXCEPT
    {
        m_pathname = static_cast< string_type&& >(p);
        return *this;
    }
    path& assign(string_type&& p) BOOST_NOEXCEPT
    {
        m_pathname = static_cast< string_type&& >(p);
        return *this;
    }
    path& assign(string_type&& p, codecvt_type const&) BOOST_NOEXCEPT
    {
        m_pathname = static_cast< string_type&& >(p);
        return *this;
    }
#endif

    path(const value_type* begin, const value_type* end) : m_pathname(begin, end) {}
    path(const value_type* begin, const value_type* end, codecvt_type const&) : m_pathname(begin, end) {}

#if !defined(BOOST_NO_CXX11_FUNCTION_TEMPLATE_DEFAULT_ARGS)
    template<
        typename InputIterator,
        typename = typename boost::enable_if_c<
            boost::conjunction<
                detail::path_traits::is_path_source_iterator< InputIterator >,
                boost::negation< detail::path_traits::is_native_char_ptr< InputIterator > >
            >::value
        >::type
    >
    path(InputIterator begin, InputIterator end)
#else
    template< typename InputIterator >
    path(InputIterator begin, InputIterator end, typename boost::enable_if_c<
        boost::conjunction<
            detail::path_traits::is_path_source_iterator< InputIterator >,
            boost::negation< detail::path_traits::is_native_char_ptr< InputIterator > >
        >::value
    >::type* = NULL)
#endif
    {
        if (begin != end)
        {
            typedef std::basic_string< typename std::iterator_traits< InputIterator >::value_type > source_t;
            source_t source(begin, end);
#if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
            assign(static_cast< source_t&& >(source));
#else
            assign(source);
#endif
        }
    }

#if !defined(BOOST_NO_CXX11_FUNCTION_TEMPLATE_DEFAULT_ARGS)
    template<
        typename InputIterator,
        typename = typename boost::enable_if_c<
            boost::conjunction<
                detail::path_traits::is_path_source_iterator< InputIterator >,
                boost::negation< detail::path_traits::is_native_char_ptr< InputIterator > >
            >::value
        >::type
    >
    path(InputIterator begin, InputIterator end, codecvt_type const& cvt)
#else
    template< typename InputIterator >
    path(InputIterator begin, InputIterator end, codecvt_type const& cvt, typename boost::enable_if_c<
        boost::conjunction<
            detail::path_traits::is_path_source_iterator< InputIterator >,
            boost::negation< detail::path_traits::is_native_char_ptr< InputIterator > >
        >::value
    >::type* = NULL)
#endif
    {
        if (begin != end)
        {
            typedef std::basic_string< typename std::iterator_traits< InputIterator >::value_type > source_t;
            source_t source(begin, end);
#if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
            assign(static_cast< source_t&& >(source), cvt);
#else
            assign(source, cvt);
#endif
        }
    }

    //  -----  assignments  -----

    // We need to explicitly define copy assignment as otherwise it will be implicitly defined as deleted because there is move assignment
    path& operator=(path const& p);

    template< typename Source >
    typename boost::enable_if_c<
        boost::disjunction<
            detail::path_traits::is_path_source< typename boost::remove_cv< Source >::type >,
            detail::path_traits::is_convertible_to_path_source< typename boost::remove_cv< Source >::type >
        >::value,
        path&
    >::type operator=(Source const& source)
    {
        return assign(source);
    }

    path& assign(path const& p)
    {
        m_pathname = p.m_pathname;
        return *this;
    }

    template< typename Source >
    typename boost::enable_if_c<
        detail::path_traits::is_path_source< typename boost::remove_cv< Source >::type >::value,
        path&
    >::type assign(Source const& source)
    {
        detail::path_traits::dispatch(source, assign_op(*this));
        return *this;
    }

    template< typename Source >
    typename boost::enable_if_c<
        boost::conjunction<
            detail::path_traits::is_convertible_to_path_source< typename boost::remove_cv< Source >::type >,
            boost::negation< detail::path_traits::is_path_source< typename boost::remove_cv< Source >::type > >
        >::value,
        path&
    >::type assign(Source const& source)
    {
        detail::path_traits::dispatch_convertible(source, assign_op(*this));
        return *this;
    }

    path& assign(path const& p, codecvt_type const&)
    {
        m_pathname = p.m_pathname;
        return *this;
    }

    template< typename Source >
    typename boost::enable_if_c<
        detail::path_traits::is_path_source< typename boost::remove_cv< Source >::type >::value,
        path&
    >::type assign(Source const& source, codecvt_type const& cvt)
    {
        detail::path_traits::dispatch(source, assign_op(*this), &cvt);
        return *this;
    }

    template< typename Source >
    typename boost::enable_if_c<
        boost::conjunction<
            detail::path_traits::is_convertible_to_path_source< typename boost::remove_cv< Source >::type >,
            boost::negation< detail::path_traits::is_path_source< typename boost::remove_cv< Source >::type > >
        >::value,
        path&
    >::type assign(Source const& source, codecvt_type const& cvt)
    {
        detail::path_traits::dispatch_convertible(source, assign_op(*this), &cvt);
        return *this;
    }

    path& assign(const value_type* begin, const value_type* end)
    {
        m_pathname.assign(begin, end);
        return *this;
    }

    template< typename InputIterator >
    typename boost::enable_if_c<
        boost::conjunction<
            detail::path_traits::is_path_source_iterator< InputIterator >,
            boost::negation< detail::path_traits::is_native_char_ptr< InputIterator > >
        >::value,
        path&
    >::type assign(InputIterator begin, InputIterator end)
    {
        m_pathname.clear();
        if (begin != end)
        {
            typedef std::basic_string< typename std::iterator_traits< InputIterator >::value_type > source_t;
            source_t source(begin, end);
#if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
            assign(static_cast< source_t&& >(source));
#else
            assign(source);
#endif
        }
        return *this;
    }

    path& assign(const value_type* begin, const value_type* end, codecvt_type const&)
    {
        m_pathname.assign(begin, end);
        return *this;
    }

    template< typename InputIterator >
    typename boost::enable_if_c<
        boost::conjunction<
            detail::path_traits::is_path_source_iterator< InputIterator >,
            boost::negation< detail::path_traits::is_native_char_ptr< InputIterator > >
        >::value,
        path&
    >::type assign(InputIterator begin, InputIterator end, codecvt_type const& cvt)
    {
        m_pathname.clear();
        if (begin != end)
        {
            typedef std::basic_string< typename std::iterator_traits< InputIterator >::value_type > source_t;
            source_t source(begin, end);
#if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
            assign(static_cast< source_t&& >(source), cvt);
#else
            assign(source, cvt);
#endif
        }
        return *this;
    }

    //  -----  concatenation  -----

    path& operator+=(path const& p);

    template< typename Source >
    typename boost::enable_if_c<
        boost::disjunction<
            detail::path_traits::is_path_source< typename boost::remove_cv< Source >::type >,
            detail::path_traits::is_convertible_to_path_source< typename boost::remove_cv< Source >::type >
        >::value,
        path&
    >::type operator+=(Source const& source)
    {
        return concat(source);
    }

    path& operator+=(value_type c)
    {
        m_pathname.push_back(c);
        return *this;
    }

    template< typename CharT >
    typename boost::enable_if_c<
        detail::path_traits::is_path_char_type< CharT >::value,
        path&
    >::type operator+=(CharT c)
    {
        CharT tmp[2];
        tmp[0] = c;
        tmp[1] = static_cast< CharT >(0);
        concat_op(*this)(tmp, tmp + 1);
        return *this;
    }

    path& concat(path const& p)
    {
        m_pathname.append(p.m_pathname);
        return *this;
    }

    template< typename Source >
    typename boost::enable_if_c<
        detail::path_traits::is_path_source< typename boost::remove_cv< Source >::type >::value,
        path&
    >::type concat(Source const& source)
    {
        detail::path_traits::dispatch(source, concat_op(*this));
        return *this;
    }

    template< typename Source >
    typename boost::enable_if_c<
        boost::conjunction<
            detail::path_traits::is_convertible_to_path_source< typename boost::remove_cv< Source >::type >,
            boost::negation< detail::path_traits::is_path_source< typename boost::remove_cv< Source >::type > >
        >::value,
        path&
    >::type concat(Source const& source)
    {
        detail::path_traits::dispatch_convertible(source, concat_op(*this));
        return *this;
    }

    path& concat(path const& p, codecvt_type const&)
    {
        m_pathname.append(p.m_pathname);
        return *this;
    }

    template< typename Source >
    typename boost::enable_if_c<
        detail::path_traits::is_path_source< typename boost::remove_cv< Source >::type >::value,
        path&
    >::type concat(Source const& source, codecvt_type const& cvt)
    {
        detail::path_traits::dispatch(source, concat_op(*this), &cvt);
        return *this;
    }

    template< typename Source >
    typename boost::enable_if_c<
        boost::conjunction<
            detail::path_traits::is_convertible_to_path_source< typename boost::remove_cv< Source >::type >,
            boost::negation< detail::path_traits::is_path_source< typename boost::remove_cv< Source >::type > >
        >::value,
        path&
    >::type concat(Source const& source, codecvt_type const& cvt)
    {
        detail::path_traits::dispatch_convertible(source, concat_op(*this), &cvt);
        return *this;
    }

    path& concat(const value_type* begin, const value_type* end)
    {
        m_pathname.append(begin, end);
        return *this;
    }

    template< typename InputIterator >
    typename boost::enable_if_c<
        boost::conjunction<
            detail::path_traits::is_path_source_iterator< InputIterator >,
            boost::negation< detail::path_traits::is_native_char_ptr< InputIterator > >
        >::value,
        path&
    >::type concat(InputIterator begin, InputIterator end)
    {
        if (begin != end)
        {
            std::basic_string< typename std::iterator_traits< InputIterator >::value_type > source(begin, end);
            detail::path_traits::dispatch(source, concat_op(*this));
        }
        return *this;
    }

    path& concat(const value_type* begin, const value_type* end, codecvt_type const&)
    {
        m_pathname.append(begin, end);
        return *this;
    }

    template< typename InputIterator >
    typename boost::enable_if_c<
        boost::conjunction<
            detail::path_traits::is_path_source_iterator< InputIterator >,
            boost::negation< detail::path_traits::is_native_char_ptr< InputIterator > >
        >::value,
        path&
    >::type concat(InputIterator begin, InputIterator end, codecvt_type const& cvt)
    {
        if (begin != end)
        {
            std::basic_string< typename std::iterator_traits< InputIterator >::value_type > source(begin, end);
            detail::path_traits::dispatch(source, concat_op(*this), &cvt);
        }
        return *this;
    }

    //  -----  appends  -----

    //  if a separator is added, it is the preferred separator for the platform;
    //  slash for POSIX, backslash for Windows

    path& operator/=(path const& p);

    template< typename Source >
    BOOST_FORCEINLINE typename boost::enable_if_c<
        boost::disjunction<
            detail::path_traits::is_path_source< typename boost::remove_cv< Source >::type >,
            detail::path_traits::is_convertible_to_path_source< typename boost::remove_cv< Source >::type >
        >::value,
        path&
    >::type operator/=(Source const& source)
    {
        return append(source);
    }

    BOOST_FORCEINLINE path& append(path const& p)
    {
        BOOST_FILESYSTEM_VERSIONED_SYM(append)(p.m_pathname.data(), p.m_pathname.data() + p.m_pathname.size());
        return *this;
    }

    template< typename Source >
    BOOST_FORCEINLINE typename boost::enable_if_c<
        detail::path_traits::is_path_source< typename boost::remove_cv< Source >::type >::value,
        path&
    >::type append(Source const& source)
    {
        detail::path_traits::dispatch(source, append_op(*this));
        return *this;
    }

    template< typename Source >
    BOOST_FORCEINLINE typename boost::enable_if_c<
        boost::conjunction<
            detail::path_traits::is_convertible_to_path_source< typename boost::remove_cv< Source >::type >,
            boost::negation< detail::path_traits::is_path_source< typename boost::remove_cv< Source >::type > >
        >::value,
        path&
    >::type append(Source const& source)
    {
        detail::path_traits::dispatch_convertible(source, append_op(*this));
        return *this;
    }

    BOOST_FORCEINLINE path& append(path const& p, codecvt_type const&)
    {
        BOOST_FILESYSTEM_VERSIONED_SYM(append)(p.m_pathname.data(), p.m_pathname.data() + p.m_pathname.size());
        return *this;
    }

    template< typename Source >
    BOOST_FORCEINLINE typename boost::enable_if_c<
        detail::path_traits::is_path_source< typename boost::remove_cv< Source >::type >::value,
        path&
    >::type append(Source const& source, codecvt_type const& cvt)
    {
        detail::path_traits::dispatch(source, append_op(*this), &cvt);
        return *this;
    }

    template< typename Source >
    BOOST_FORCEINLINE typename boost::enable_if_c<
        boost::conjunction<
            detail::path_traits::is_convertible_to_path_source< typename boost::remove_cv< Source >::type >,
            boost::negation< detail::path_traits::is_path_source< typename boost::remove_cv< Source >::type > >
        >::value,
        path&
    >::type append(Source const& source, codecvt_type const& cvt)
    {
        detail::path_traits::dispatch_convertible(source, append_op(*this), &cvt);
        return *this;
    }

    BOOST_FORCEINLINE path& append(const value_type* begin, const value_type* end)
    {
        BOOST_FILESYSTEM_VERSIONED_SYM(append)(begin, end);
        return *this;
    }

    template< typename InputIterator >
    BOOST_FORCEINLINE typename boost::enable_if_c<
        boost::conjunction<
            detail::path_traits::is_path_source_iterator< InputIterator >,
            boost::negation< detail::path_traits::is_native_char_ptr< InputIterator > >
        >::value,
        path&
    >::type append(InputIterator begin, InputIterator end)
    {
        std::basic_string< typename std::iterator_traits< InputIterator >::value_type > source(begin, end);
        detail::path_traits::dispatch(source, append_op(*this));
        return *this;
    }

    BOOST_FORCEINLINE path& append(const value_type* begin, const value_type* end, codecvt_type const&)
    {
        BOOST_FILESYSTEM_VERSIONED_SYM(append)(begin, end);
        return *this;
    }

    template< typename InputIterator >
    BOOST_FORCEINLINE typename boost::enable_if_c<
        boost::conjunction<
            detail::path_traits::is_path_source_iterator< InputIterator >,
            boost::negation< detail::path_traits::is_native_char_ptr< InputIterator > >
        >::value,
        path&
    >::type append(InputIterator begin, InputIterator end, const codecvt_type& cvt)
    {
        std::basic_string< typename std::iterator_traits< InputIterator >::value_type > source(begin, end);
        detail::path_traits::dispatch(source, append_op(*this), &cvt);
        return *this;
    }

    //  -----  modifiers  -----

    void clear() BOOST_NOEXCEPT { m_pathname.clear(); }
#ifdef BOOST_POSIX_API
    path& make_preferred()
    {
        // No effect on POSIX
        return *this;
    }
#else // BOOST_WINDOWS_API
    BOOST_FILESYSTEM_DECL path& make_preferred(); // change slashes to backslashes
#endif
    BOOST_FILESYSTEM_DECL path& remove_filename();
    BOOST_FILESYSTEM_DECL path& remove_trailing_separator();
    BOOST_FORCEINLINE path& replace_extension(path const& new_extension = path())
    {
        BOOST_FILESYSTEM_VERSIONED_SYM(replace_extension)(new_extension);
        return *this;
    }
    void swap(path& rhs) BOOST_NOEXCEPT { m_pathname.swap(rhs.m_pathname); }

    //  -----  observers  -----

    //  For operating systems that format file paths differently than directory
    //  paths, return values from observers are formatted as file names unless there
    //  is a trailing separator, in which case returns are formatted as directory
    //  paths. POSIX and Windows make no such distinction.

    //  Implementations are permitted to return const values or const references.

    //  The string or path returned by an observer are specified as being formatted
    //  as "native" or "generic".
    //
    //  For POSIX, these are all the same format; slashes and backslashes are as input and
    //  are not modified.
    //
    //  For Windows,   native:    as input; slashes and backslashes are not modified;
    //                            this is the format of the internally stored string.
    //                 generic:   backslashes are converted to slashes

    //  -----  native format observers  -----

    string_type const& native() const BOOST_NOEXCEPT { return m_pathname; }
    const value_type* c_str() const BOOST_NOEXCEPT { return m_pathname.c_str(); }
    string_type::size_type size() const BOOST_NOEXCEPT { return m_pathname.size(); }

    template< typename String >
    String string() const;

    template< typename String >
    String string(codecvt_type const& cvt) const;

#ifdef BOOST_WINDOWS_API
    std::string string() const
    {
        std::string tmp;
        if (!m_pathname.empty())
            detail::path_traits::convert(m_pathname.data(), m_pathname.data() + m_pathname.size(), tmp);
        return tmp;
    }
    std::string string(codecvt_type const& cvt) const
    {
        std::string tmp;
        if (!m_pathname.empty())
            detail::path_traits::convert(m_pathname.data(), m_pathname.data() + m_pathname.size(), tmp, &cvt);
        return tmp;
    }

    //  string_type is std::wstring, so there is no conversion
    std::wstring const& wstring() const { return m_pathname; }
    std::wstring const& wstring(codecvt_type const&) const { return m_pathname; }
#else // BOOST_POSIX_API
    //  string_type is std::string, so there is no conversion
    std::string const& string() const { return m_pathname; }
    std::string const& string(codecvt_type const&) const { return m_pathname; }

    std::wstring wstring() const
    {
        std::wstring tmp;
        if (!m_pathname.empty())
            detail::path_traits::convert(m_pathname.data(), m_pathname.data() + m_pathname.size(), tmp);
        return tmp;
    }
    std::wstring wstring(codecvt_type const& cvt) const
    {
        std::wstring tmp;
        if (!m_pathname.empty())
            detail::path_traits::convert(m_pathname.data(), m_pathname.data() + m_pathname.size(), tmp, &cvt);
        return tmp;
    }
#endif

    //  -----  generic format observers  -----

    //  Experimental generic function returning generic formatted path (i.e. separators
    //  are forward slashes). Motivation: simpler than a family of generic_*string
    //  functions.
#ifdef BOOST_WINDOWS_API
    BOOST_FILESYSTEM_DECL path generic_path() const;
#else
    path generic_path() const;
#endif

    template< typename String >
    String generic_string() const;

    template< typename String >
    String generic_string(codecvt_type const& cvt) const;

#ifdef BOOST_WINDOWS_API
    std::string generic_string() const { return generic_path().string(); }
    std::string generic_string(codecvt_type const& cvt) const { return generic_path().string(cvt); }
    std::wstring generic_wstring() const { return generic_path().wstring(); }
    std::wstring generic_wstring(codecvt_type const&) const { return generic_wstring(); }
#else // BOOST_POSIX_API
    //  On POSIX-like systems, the generic format is the same as the native format
    std::string const& generic_string() const { return m_pathname; }
    std::string const& generic_string(codecvt_type const&) const { return m_pathname; }
    std::wstring generic_wstring() const { return this->wstring(); }
    std::wstring generic_wstring(codecvt_type const& cvt) const { return this->wstring(cvt); }
#endif

    //  -----  compare  -----

    BOOST_FORCEINLINE int compare(path const& p) const // generic, lexicographical
    {
        return BOOST_FILESYSTEM_VERSIONED_SYM(compare)(p);
    }

    //  -----  decomposition  -----

    path root_path() const { return path(m_pathname.c_str(), m_pathname.c_str() + find_root_path_size()); }
    // returns 0 or 1 element path even on POSIX, root_name() is non-empty() for network paths
    path root_name() const { return path(m_pathname.c_str(), m_pathname.c_str() + find_root_name_size()); }

    // returns 0 or 1 element path
    path root_directory() const
    {
        path_detail::substring root_dir = find_root_directory();
        const value_type* p = m_pathname.c_str() + root_dir.pos;
        return path(p, p + root_dir.size);
    }

    path relative_path() const
    {
        path_detail::substring rel_path = find_relative_path();
        const value_type* p = m_pathname.c_str() + rel_path.pos;
        return path(p, p + rel_path.size);
    }

    path parent_path() const { return path(m_pathname.c_str(), m_pathname.c_str() + find_parent_path_size()); }

    BOOST_FORCEINLINE path filename() const { return BOOST_FILESYSTEM_VERSIONED_SYM(filename)(); }   // returns 0 or 1 element path
    BOOST_FORCEINLINE path stem() const { return BOOST_FILESYSTEM_VERSIONED_SYM(stem)(); }           // returns 0 or 1 element path
    BOOST_FORCEINLINE path extension() const { return BOOST_FILESYSTEM_VERSIONED_SYM(extension)(); } // returns 0 or 1 element path

    //  -----  query  -----

    bool empty() const BOOST_NOEXCEPT { return m_pathname.empty(); }
    bool filename_is_dot() const;
    bool filename_is_dot_dot() const;
    bool has_root_path() const { return find_root_path_size() > 0; }
    bool has_root_name() const { return find_root_name_size() > 0; }
    bool has_root_directory() const { return find_root_directory().size > 0; }
    bool has_relative_path() const { return find_relative_path().size > 0; }
    bool has_parent_path() const { return find_parent_path_size() > 0; }
    BOOST_FORCEINLINE bool has_filename() const { return BOOST_FILESYSTEM_VERSIONED_SYM(has_filename)(); }
    bool has_stem() const { return !stem().empty(); }
    bool has_extension() const { return !extension().empty(); }
    bool is_relative() const { return !is_absolute(); }
    bool is_absolute() const
    {
        // Windows CE has no root name (aka drive letters)
#if defined(BOOST_WINDOWS_API) && !defined(UNDER_CE)
        return has_root_name() && has_root_directory();
#else
        return has_root_directory();
#endif
    }

    //  -----  lexical operations  -----

    BOOST_FORCEINLINE path lexically_normal() const { return BOOST_FILESYSTEM_VERSIONED_SYM(lexically_normal)(); }
    BOOST_FILESYSTEM_DECL path lexically_relative(path const& base) const;
    path lexically_proximate(path const& base) const;

    //  -----  iterators  -----

    BOOST_FILESYSTEM_DECL iterator begin() const;
    BOOST_FILESYSTEM_DECL iterator end() const;
    reverse_iterator rbegin() const;
    reverse_iterator rend() const;

    //  -----  static member functions  -----

    static BOOST_FILESYSTEM_DECL std::locale imbue(std::locale const& loc);
    static BOOST_FILESYSTEM_DECL codecvt_type const& codecvt();

    //  -----  deprecated functions  -----

#if !defined(BOOST_FILESYSTEM_NO_DEPRECATED)
    //  recently deprecated functions supplied by default
    path& normalize();
    BOOST_FILESYSTEM_DETAIL_DEPRECATED("Use path::remove_filename() instead")
    path& remove_leaf() { return remove_filename(); }
    BOOST_FILESYSTEM_DETAIL_DEPRECATED("Use path::filename() instead")
    path leaf() const { return filename(); }
    BOOST_FILESYSTEM_DETAIL_DEPRECATED("Use path::parent_path() instead")
    path branch_path() const { return parent_path(); }
    BOOST_FILESYSTEM_DETAIL_DEPRECATED("Use path::generic_path() instead")
    path generic() const { return generic_path(); }
    BOOST_FILESYSTEM_DETAIL_DEPRECATED("Use !path::empty() instead")
    bool has_leaf() const { return !m_pathname.empty(); }
    BOOST_FILESYSTEM_DETAIL_DEPRECATED("Use path::has_parent_path() instead")
    bool has_branch_path() const { return has_parent_path(); }
    BOOST_FILESYSTEM_DETAIL_DEPRECATED("Use path::is_absolute() instead")
    bool is_complete() const { return is_absolute(); }
#endif

#if defined(BOOST_FILESYSTEM_DEPRECATED)
    //  deprecated functions with enough signature or semantic changes that they are
    //  not supplied by default
    BOOST_FILESYSTEM_DETAIL_DEPRECATED("Use path::string() instead")
    std::string file_string() const { return string(); }
    BOOST_FILESYSTEM_DETAIL_DEPRECATED("Use path::string() instead")
    std::string directory_string() const { return string(); }
    BOOST_FILESYSTEM_DETAIL_DEPRECATED("Use path::string() instead")
    std::string native_file_string() const { return string(); }
    BOOST_FILESYSTEM_DETAIL_DEPRECATED("Use path::string() instead")
    std::string native_directory_string() const { return string(); }
    BOOST_FILESYSTEM_DETAIL_DEPRECATED("Use path::native() instead")
    string_type external_file_string() const { return native(); }
    BOOST_FILESYSTEM_DETAIL_DEPRECATED("Use path::native() instead")
    string_type external_directory_string() const { return native(); }
#endif

    //--------------------------------------------------------------------------------------//
    //                            class path private members                                //
    //--------------------------------------------------------------------------------------//
private:
    bool has_filename_v3() const { return !m_pathname.empty(); }
    bool has_filename_v4() const { return find_filename_v4_size() > 0; }
    BOOST_FILESYSTEM_DECL path filename_v3() const;
    path filename_v4() const
    {
        string_type::size_type filename_size = find_filename_v4_size();
        string_type::size_type pos = m_pathname.size() - filename_size;
        const value_type* p = m_pathname.c_str() + pos;
        return path(p, p + filename_size);
    }
    BOOST_FILESYSTEM_DECL path stem_v3() const;
    BOOST_FILESYSTEM_DECL path stem_v4() const;
    BOOST_FILESYSTEM_DECL path extension_v3() const;
    path extension_v4() const
    {
        string_type::size_type extension_size = find_extension_v4_size();
        string_type::size_type pos = m_pathname.size() - extension_size;
        const value_type* p = m_pathname.c_str() + pos;
        return path(p, p + extension_size);
    }

    BOOST_FILESYSTEM_DECL void replace_extension_v3(path const& new_extension);
    BOOST_FILESYSTEM_DECL void replace_extension_v4(path const& new_extension);

    BOOST_FILESYSTEM_DECL path lexically_normal_v3() const;
    BOOST_FILESYSTEM_DECL path lexically_normal_v4() const;

    BOOST_FILESYSTEM_DECL int compare_v3(path const& p) const;
    BOOST_FILESYSTEM_DECL int compare_v4(path const& p) const;

    BOOST_FILESYSTEM_DECL void append_v3(const value_type* b, const value_type* e);
    BOOST_FILESYSTEM_DECL void append_v4(const value_type* b, const value_type* e);

    //  Returns: If separator is to be appended, m_pathname.size() before append. Otherwise 0.
    //  Note: An append is never performed if size()==0, so a returned 0 is unambiguous.
    BOOST_FILESYSTEM_DECL string_type::size_type append_separator_if_needed();
    BOOST_FILESYSTEM_DECL void erase_redundant_separator(string_type::size_type sep_pos);

    BOOST_FILESYSTEM_DECL string_type::size_type find_root_name_size() const;
    BOOST_FILESYSTEM_DECL string_type::size_type find_root_path_size() const;
    BOOST_FILESYSTEM_DECL path_detail::substring find_root_directory() const;
    BOOST_FILESYSTEM_DECL path_detail::substring find_relative_path() const;
    BOOST_FILESYSTEM_DECL string_type::size_type find_parent_path_size() const;
    BOOST_FILESYSTEM_DECL string_type::size_type find_filename_v4_size() const;
    BOOST_FILESYSTEM_DECL string_type::size_type find_extension_v4_size() const;

private:
    /*
     * m_pathname has the type, encoding, and format required by the native
     * operating system. Thus for POSIX and Windows there is no conversion for
     * passing m_pathname.c_str() to the O/S API or when obtaining a path from the
     * O/S API. POSIX encoding is unspecified other than for dot and slash
     * characters; POSIX just treats paths as a sequence of bytes. Windows
     * encoding is UCS-2 or UTF-16 depending on the version.
     */
    string_type m_pathname;     // Windows: as input; backslashes NOT converted to slashes,
                                // slashes NOT converted to backslashes
};

namespace detail {
BOOST_FILESYSTEM_DECL int lex_compare_v3(path::iterator first1, path::iterator last1, path::iterator first2, path::iterator last2);
BOOST_FILESYSTEM_DECL int lex_compare_v4(path::iterator first1, path::iterator last1, path::iterator first2, path::iterator last2);
BOOST_FILESYSTEM_DECL path const& dot_path();
BOOST_FILESYSTEM_DECL path const& dot_dot_path();
} // namespace detail

#ifndef BOOST_FILESYSTEM_NO_DEPRECATED
typedef path wpath;
#endif

//------------------------------------------------------------------------------------//
//                             class path::iterator                                   //
//------------------------------------------------------------------------------------//

class path::iterator :
    public boost::iterator_facade<
        path::iterator,
        const path,
        boost::bidirectional_traversal_tag
    >
{
private:
    friend class boost::iterator_core_access;
    friend class boost::filesystem::path;
    friend class boost::filesystem::path::reverse_iterator;
    friend BOOST_FILESYSTEM_DECL int detail::lex_compare_v3(path::iterator first1, path::iterator last1, path::iterator first2, path::iterator last2);

    path const& dereference() const { return m_element; }

    bool equal(iterator const& rhs) const
    {
        return m_path_ptr == rhs.m_path_ptr && m_pos == rhs.m_pos;
    }

    BOOST_FORCEINLINE void increment() { BOOST_FILESYSTEM_VERSIONED_SYM(increment)(); }
    BOOST_FORCEINLINE void decrement() { BOOST_FILESYSTEM_VERSIONED_SYM(decrement)(); }

private:
    BOOST_FILESYSTEM_DECL void increment_v3();
    BOOST_FILESYSTEM_DECL void increment_v4();
    BOOST_FILESYSTEM_DECL void decrement_v3();
    BOOST_FILESYSTEM_DECL void decrement_v4();

private:
    // current element
    path m_element;
    // path being iterated over
    const path* m_path_ptr;
    // position of m_element in m_path_ptr->m_pathname.
    // if m_element is implicit dot, m_pos is the
    // position of the last separator in the path.
    // end() iterator is indicated by
    // m_pos == m_path_ptr->m_pathname.size()
    string_type::size_type m_pos;
};

//------------------------------------------------------------------------------------//
//                         class path::reverse_iterator                               //
//------------------------------------------------------------------------------------//

class path::reverse_iterator :
    public boost::iterator_facade<
        path::reverse_iterator,
        const path,
        boost::bidirectional_traversal_tag
    >
{
public:
    explicit reverse_iterator(iterator itr) :
        m_itr(itr)
    {
        if (itr != itr.m_path_ptr->begin())
            m_element = *--itr;
    }

private:
    friend class boost::iterator_core_access;
    friend class boost::filesystem::path;

    path const& dereference() const { return m_element; }
    bool equal(reverse_iterator const& rhs) const { return m_itr == rhs.m_itr; }

    void increment()
    {
        --m_itr;
        if (m_itr != m_itr.m_path_ptr->begin())
        {
            iterator tmp = m_itr;
            m_element = *--tmp;
        }
    }

    void decrement()
    {
        m_element = *m_itr;
        ++m_itr;
    }

private:
    iterator m_itr;
    path m_element;
};

//------------------------------------------------------------------------------------//
//                                                                                    //
//                              non-member functions                                  //
//                                                                                    //
//------------------------------------------------------------------------------------//

//  std::lexicographical_compare would infinitely recurse because path iterators
//  yield paths, so provide a path aware version
BOOST_FORCEINLINE bool lexicographical_compare(path::iterator first1, path::iterator last1, path::iterator first2, path::iterator last2)
{
    return BOOST_FILESYSTEM_VERSIONED_SYM(detail::lex_compare)(first1, last1, first2, last2) < 0;
}

BOOST_FORCEINLINE bool operator==(path const& lhs, path const& rhs)
{
    return lhs.compare(rhs) == 0;
}

BOOST_FORCEINLINE bool operator!=(path const& lhs, path const& rhs)
{
    return lhs.compare(rhs) != 0;
}

BOOST_FORCEINLINE bool operator<(path const& lhs, path const& rhs)
{
    return lhs.compare(rhs) < 0;
}

BOOST_FORCEINLINE bool operator<=(path const& lhs, path const& rhs)
{
    return !(rhs < lhs);
}

BOOST_FORCEINLINE bool operator>(path const& lhs, path const& rhs)
{
    return rhs < lhs;
}

BOOST_FORCEINLINE bool operator>=(path const& lhs, path const& rhs)
{
    return !(lhs < rhs);
}

// Note: Declared as a template to delay binding to Boost.ContainerHash functions and make the dependency optional
template< typename T >
inline typename boost::enable_if_c<
    boost::is_same< T, path >::value,
    std::size_t
>::type hash_value(T const& p) BOOST_NOEXCEPT
{
#ifdef BOOST_WINDOWS_API
    std::size_t seed = 0u;
    for (typename T::value_type const* it = p.c_str(); *it; ++it)
        hash_combine(seed, *it == L'/' ? L'\\' : *it);
    return seed;
#else // BOOST_POSIX_API
    return hash_range(p.native().begin(), p.native().end());
#endif
}

inline void swap(path& lhs, path& rhs) BOOST_NOEXCEPT
{
    lhs.swap(rhs);
}

BOOST_FORCEINLINE path operator/(path lhs, path const& rhs)
{
    lhs.append(rhs);
    return lhs;
}

template< typename Source >
BOOST_FORCEINLINE typename boost::enable_if_c<
    boost::disjunction<
        detail::path_traits::is_path_source< typename boost::remove_cv< Source >::type >,
        detail::path_traits::is_convertible_to_path_source< typename boost::remove_cv< Source >::type >
    >::value,
    path
>::type operator/(path lhs, Source const& rhs)
{
    lhs.append(rhs);
    return lhs;
}

//  inserters and extractors
//    use boost::io::quoted() to handle spaces in paths
//    use '&' as escape character to ease use for Windows paths

template< typename Char, typename Traits >
inline std::basic_ostream< Char, Traits >&
operator<<(std::basic_ostream< Char, Traits >& os, path const& p)
{
    return os << boost::io::quoted(p.template string< std::basic_string< Char > >(), static_cast< Char >('&'));
}

template< typename Char, typename Traits >
inline std::basic_istream< Char, Traits >&
operator>>(std::basic_istream< Char, Traits >& is, path& p)
{
    std::basic_string< Char > str;
    is >> boost::io::quoted(str, static_cast< Char >('&'));
    p = str;
    return is;
}

//  name_checks

//  These functions are holdovers from version 1. It isn't clear they have much
//  usefulness, or how to generalize them for later versions.

BOOST_FILESYSTEM_DECL bool portable_posix_name(std::string const& name);
BOOST_FILESYSTEM_DECL bool windows_name(std::string const& name);
BOOST_FILESYSTEM_DECL bool portable_name(std::string const& name);
BOOST_FILESYSTEM_DECL bool portable_directory_name(std::string const& name);
BOOST_FILESYSTEM_DECL bool portable_file_name(std::string const& name);
BOOST_FILESYSTEM_DECL bool native(std::string const& name);

namespace detail {

//  For POSIX, is_directory_separator() and is_element_separator() are identical since
//  a forward slash is the only valid directory separator and also the only valid
//  element separator. For Windows, forward slash and back slash are the possible
//  directory separators, but colon (example: "c:foo") is also an element separator.
inline bool is_directory_separator(path::value_type c) BOOST_NOEXCEPT
{
    return c == path::separator
#ifdef BOOST_WINDOWS_API
        || c == path::preferred_separator
#endif
        ;
}

inline bool is_element_separator(path::value_type c) BOOST_NOEXCEPT
{
    return c == path::separator
#ifdef BOOST_WINDOWS_API
        || c == path::preferred_separator || c == L':'
#endif
        ;
}

} // namespace detail

//------------------------------------------------------------------------------------//
//                  class path miscellaneous function implementations                 //
//------------------------------------------------------------------------------------//

// Note: Because of the range constructor in C++23 std::string_view that involves a check for contiguous_range concept,
//       any non-template function call that requires a check whether the source argument (which may be fs::path)
//       is convertible to std::string_view must be made after fs::path::iterator is defined. This includes overload
//       resolution and SFINAE checks. Otherwise, the concept check result formally changes between fs::path::iterator
//       is not defined and defined, which causes compilation errors with gcc 11 and later.
//       https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106808

inline path& path::operator=(path const& p)
{
    return assign(p);
}

inline path& path::operator+=(path const& p)
{
    return concat(p);
}

BOOST_FORCEINLINE path& path::operator/=(path const& p)
{
    return append(p);
}

#if !defined(BOOST_WINDOWS_API)
inline path path::generic_path() const
{
    return path(*this);
}
#endif

inline path path::lexically_proximate(path const& base) const
{
    path tmp(lexically_relative(base));
    return tmp.empty() ? *this : tmp;
}

inline path::reverse_iterator path::rbegin() const
{
    return reverse_iterator(end());
}

inline path::reverse_iterator path::rend() const
{
    return reverse_iterator(begin());
}

inline bool path::filename_is_dot() const
{
    // implicit dot is tricky, so actually call filename(); see path::filename() example
    // in reference.html
    path p(filename());
    return p.size() == 1 && *p.c_str() == dot;
}

inline bool path::filename_is_dot_dot() const
{
    return size() >= 2 && m_pathname[size() - 1] == dot && m_pathname[size() - 2] == dot && (m_pathname.size() == 2 || detail::is_element_separator(m_pathname[size() - 3]));
    // use detail::is_element_separator() rather than detail::is_directory_separator
    // to deal with "c:.." edge case on Windows when ':' acts as a separator
}

#if !defined(BOOST_FILESYSTEM_NO_DEPRECATED)

BOOST_FILESYSTEM_DETAIL_DEPRECATED("Use path::lexically_normal() instead")
inline path& path::normalize()
{
    path tmp(lexically_normal());
    m_pathname.swap(tmp.m_pathname);
    return *this;
}

#endif // !defined(BOOST_FILESYSTEM_NO_DEPRECATED)

//--------------------------------------------------------------------------------------//
//                     class path member template specializations                       //
//--------------------------------------------------------------------------------------//

template< >
inline std::string path::string< std::string >() const
{
    return string();
}

template< >
inline std::wstring path::string< std::wstring >() const
{
    return wstring();
}

template< >
inline std::string path::string< std::string >(codecvt_type const& cvt) const
{
    return string(cvt);
}

template< >
inline std::wstring path::string< std::wstring >(codecvt_type const& cvt) const
{
    return wstring(cvt);
}

template< >
inline std::string path::generic_string< std::string >() const
{
    return generic_string();
}

template< >
inline std::wstring path::generic_string< std::wstring >() const
{
    return generic_wstring();
}

template< >
inline std::string path::generic_string< std::string >(codecvt_type const& cvt) const
{
    return generic_string(cvt);
}

template< >
inline std::wstring path::generic_string< std::wstring >(codecvt_type const& cvt) const
{
    return generic_wstring(cvt);
}

} // namespace filesystem
} // namespace boost

//----------------------------------------------------------------------------//

#include <boost/filesystem/detail/footer.hpp>

#endif // BOOST_FILESYSTEM_PATH_HPP