ceph/src/boost/boost/container_hash/hash.hpp

   1
   2 // Copyright 2005-2014 Daniel James.
   3 // Distributed under the Boost Software License, Version 1.0. (See accompanying
   4 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   5
   6 //  Based on Peter Dimov's proposal
   7 //  http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2005/n1756.pdf
   8 //  issue 6.18.
   9 //
  10 //  This also contains public domain code from MurmurHash. From the
  11 //  MurmurHash header:
  12
  13 // MurmurHash3 was written by Austin Appleby, and is placed in the public
  14 // domain. The author hereby disclaims copyright to this source code.
  15
  16 #if !defined(BOOST_FUNCTIONAL_HASH_HASH_HPP)
  17 #define BOOST_FUNCTIONAL_HASH_HASH_HPP
  18
  19 #include <boost/container_hash/hash_fwd.hpp>
  20 #include <functional>
  21 #include <iterator>
  22 #include <boost/container_hash/detail/hash_float.hpp>
  23 #include <string>
  24 #include <boost/limits.hpp>
  25 #include <boost/type_traits/is_enum.hpp>
  26 #include <boost/type_traits/is_integral.hpp>
  27 #include <boost/core/enable_if.hpp>
  28 #include <boost/cstdint.hpp>
  29 #include <climits>
  30
  31 #if defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
  32 #include <boost/type_traits/is_pointer.hpp>
  33 #endif
  34
  35 #if !defined(BOOST_NO_CXX11_HDR_TYPEINDEX)
  36 #include <typeindex>
  37 #endif
  38
  39 #if !defined(BOOST_NO_CXX11_HDR_SYSTEM_ERROR)
  40 #include <system_error>
  41 #endif
  42
  43 #if defined(BOOST_MSVC)
  44 #pragma warning(push)
  45
  46 #if BOOST_MSVC >= 1400
  47 #pragma warning(disable:6295) // Ill-defined for-loop : 'unsigned int' values
  48                               // are always of range '0' to '4294967295'.
  49                               // Loop executes infinitely.
  50 #endif
  51
  52 #endif
  53
  54 #if BOOST_WORKAROUND(__GNUC__, < 3) \
  55     && !defined(__SGI_STL_PORT) && !defined(_STLPORT_VERSION)
  56 #define BOOST_HASH_CHAR_TRAITS string_char_traits
  57 #else
  58 #define BOOST_HASH_CHAR_TRAITS char_traits
  59 #endif
  60
  61 #if defined(_MSC_VER)
  62 #   define BOOST_FUNCTIONAL_HASH_ROTL32(x, r) _rotl(x,r)
  63 #else
  64 #   define BOOST_FUNCTIONAL_HASH_ROTL32(x, r) (x << r) | (x >> (32 - r))
  65 #endif
  66
  67 // Detect whether standard library has C++17 headers
  68
  69 #if !defined(BOOST_HASH_CXX17)
  70 #   if defined(BOOST_MSVC)
  71 #       if defined(_HAS_CXX17) && _HAS_CXX17
  72 #           define BOOST_HASH_CXX17 1
  73 #       endif
  74 #   elif defined(__cplusplus) && __cplusplus >= 201703
  75 #       define BOOST_HASH_CXX17 1
  76 #   endif
  77 #endif
  78
  79 #if !defined(BOOST_HASH_CXX17)
  80 #   define BOOST_HASH_CXX17 0
  81 #endif
  82
  83 #if BOOST_HASH_CXX17 && defined(__has_include)
  84 #   if !defined(BOOST_HASH_HAS_STRING_VIEW) && __has_include(<string_view>)
  85 #       define BOOST_HASH_HAS_STRING_VIEW 1
  86 #   endif
  87 #   if !defined(BOOST_HASH_HAS_OPTIONAL) && __has_include(<optional>)
  88 #       define BOOST_HASH_HAS_OPTIONAL 1
  89 #   endif
  90 #   if !defined(BOOST_HASH_HAS_VARIANT) && __has_include(<variant>)
  91 #       define BOOST_HASH_HAS_VARIANT 1
  92 #   endif
  93 #endif
  94
  95 #if !defined(BOOST_HASH_HAS_STRING_VIEW)
  96 #   define BOOST_HASH_HAS_STRING_VIEW 0
  97 #endif
  98
  99 #if !defined(BOOST_HASH_HAS_OPTIONAL)
 100 #   define BOOST_HASH_HAS_OPTIONAL 0
 101 #endif
 102
 103 #if !defined(BOOST_HASH_HAS_VARIANT)
 104 #   define BOOST_HASH_HAS_VARIANT 0
 105 #endif
 106
 107 #if BOOST_HASH_HAS_STRING_VIEW
 108 #   include <string_view>
 109 #endif
 110
 111 #if BOOST_HASH_HAS_OPTIONAL
 112 #   include <optional>
 113 #endif
 114
 115 #if BOOST_HASH_HAS_VARIANT
 116 #   include <variant>
 117 #endif
 118
 119 namespace boost
 120 {
 121     namespace hash_detail
 122     {
 123 #if defined(BOOST_NO_CXX98_FUNCTION_BASE)
 124         template <typename T>
 125         struct hash_base
 126         {
 127             typedef T argument_type;
 128             typedef std::size_t result_type;
 129         };
 130 #else
 131         template <typename T>
 132         struct hash_base : std::unary_function<T, std::size_t> {};
 133 #endif
 134
 135         struct enable_hash_value { typedef std::size_t type; };
 136
 137         template <typename T> struct basic_numbers {};
 138         template <typename T> struct long_numbers;
 139         template <typename T> struct ulong_numbers;
 140         template <typename T> struct float_numbers {};
 141
 142         template <> struct basic_numbers<bool> :
 143             boost::hash_detail::enable_hash_value {};
 144         template <> struct basic_numbers<char> :
 145             boost::hash_detail::enable_hash_value {};
 146         template <> struct basic_numbers<unsigned char> :
 147             boost::hash_detail::enable_hash_value {};
 148         template <> struct basic_numbers<signed char> :
 149             boost::hash_detail::enable_hash_value {};
 150         template <> struct basic_numbers<short> :
 151             boost::hash_detail::enable_hash_value {};
 152         template <> struct basic_numbers<unsigned short> :
 153             boost::hash_detail::enable_hash_value {};
 154         template <> struct basic_numbers<int> :
 155             boost::hash_detail::enable_hash_value {};
 156         template <> struct basic_numbers<unsigned int> :
 157             boost::hash_detail::enable_hash_value {};
 158         template <> struct basic_numbers<long> :
 159             boost::hash_detail::enable_hash_value {};
 160         template <> struct basic_numbers<unsigned long> :
 161             boost::hash_detail::enable_hash_value {};
 162
 163 #if !defined(BOOST_NO_INTRINSIC_WCHAR_T)
 164         template <> struct basic_numbers<wchar_t> :
 165             boost::hash_detail::enable_hash_value {};
 166 #endif
 167
 168 #if !defined(BOOST_NO_CXX11_CHAR16_T)
 169         template <> struct basic_numbers<char16_t> :
 170             boost::hash_detail::enable_hash_value {};
 171 #endif
 172
 173 #if !defined(BOOST_NO_CXX11_CHAR32_T)
 174         template <> struct basic_numbers<char32_t> :
 175             boost::hash_detail::enable_hash_value {};
 176 #endif
 177
 178         // long_numbers is defined like this to allow for separate
 179         // specialization for long_long and int128_type, in case
 180         // they conflict.
 181         template <typename T> struct long_numbers2 {};
 182         template <typename T> struct ulong_numbers2 {};
 183         template <typename T> struct long_numbers : long_numbers2<T> {};
 184         template <typename T> struct ulong_numbers : ulong_numbers2<T> {};
 185
 186 #if !defined(BOOST_NO_LONG_LONG)
 187         template <> struct long_numbers<boost::long_long_type> :
 188             boost::hash_detail::enable_hash_value {};
 189         template <> struct ulong_numbers<boost::ulong_long_type> :
 190             boost::hash_detail::enable_hash_value {};
 191 #endif
 192
 193 #if defined(BOOST_HAS_INT128)
 194         template <> struct long_numbers2<boost::int128_type> :
 195             boost::hash_detail::enable_hash_value {};
 196         template <> struct ulong_numbers2<boost::uint128_type> :
 197             boost::hash_detail::enable_hash_value {};
 198 #endif
 199
 200         template <> struct float_numbers<float> :
 201             boost::hash_detail::enable_hash_value {};
 202         template <> struct float_numbers<double> :
 203             boost::hash_detail::enable_hash_value {};
 204         template <> struct float_numbers<long double> :
 205             boost::hash_detail::enable_hash_value {};
 206     }
 207
 208     template <typename T>
 209     typename boost::hash_detail::basic_numbers<T>::type hash_value(T);
 210     template <typename T>
 211     typename boost::hash_detail::long_numbers<T>::type hash_value(T);
 212     template <typename T>
 213     typename boost::hash_detail::ulong_numbers<T>::type hash_value(T);
 214
 215     template <typename T>
 216     typename boost::enable_if<boost::is_enum<T>, std::size_t>::type
 217         hash_value(T);
 218
 219 #if !BOOST_WORKAROUND(__DMC__, <= 0x848)
 220     template <class T> std::size_t hash_value(T* const&);
 221 #else
 222     template <class T> std::size_t hash_value(T*);
 223 #endif
 224
 225 #if !defined(BOOST_NO_FUNCTION_TEMPLATE_ORDERING)
 226     template< class T, unsigned N >
 227     std::size_t hash_value(const T (&x)[N]);
 228
 229     template< class T, unsigned N >
 230     std::size_t hash_value(T (&x)[N]);
 231 #endif
 232
 233     template <class Ch, class A>
 234     std::size_t hash_value(
 235         std::basic_string<Ch, std::BOOST_HASH_CHAR_TRAITS<Ch>, A> const&);
 236
 237 #if BOOST_HASH_HAS_STRING_VIEW
 238     template <class Ch>
 239     std::size_t hash_value(
 240         std::basic_string_view<Ch, std::BOOST_HASH_CHAR_TRAITS<Ch> > const&);
 241 #endif
 242
 243     template <typename T>
 244     typename boost::hash_detail::float_numbers<T>::type hash_value(T);
 245
 246 #if BOOST_HASH_HAS_OPTIONAL
 247     template <typename T>
 248     std::size_t hash_value(std::optional<T> const&);
 249 #endif
 250
 251 #if BOOST_HASH_HAS_VARIANT
 252     std::size_t hash_value(std::monostate);
 253     template <typename... Types>
 254     std::size_t hash_value(std::variant<Types...> const&);
 255 #endif
 256
 257 #if !defined(BOOST_NO_CXX11_HDR_TYPEINDEX)
 258     std::size_t hash_value(std::type_index);
 259 #endif
 260
 261 #if !defined(BOOST_NO_CXX11_HDR_SYSTEM_ERROR)
 262     std::size_t hash_value(std::error_code const&);
 263     std::size_t hash_value(std::error_condition const&);
 264 #endif
 265
 266     // Implementation
 267
 268     namespace hash_detail
 269     {
 270         template <class T>
 271         inline std::size_t hash_value_signed(T val)
 272         {
 273              const unsigned int size_t_bits = std::numeric_limits<std::size_t>::digits;
 274              // ceiling(std::numeric_limits<T>::digits / size_t_bits) - 1
 275              const int length = (std::numeric_limits<T>::digits - 1)
 276                  / static_cast<int>(size_t_bits);
 277
 278              std::size_t seed = 0;
 279              T positive = val < 0 ? -1 - val : val;
 280
 281              // Hopefully, this loop can be unrolled.
 282              for(unsigned int i = length * size_t_bits; i > 0; i -= size_t_bits)
 283              {
 284                  seed ^= (std::size_t) (positive >> i) + (seed<<6) + (seed>>2);
 285              }
 286              seed ^= (std::size_t) val + (seed<<6) + (seed>>2);
 287
 288              return seed;
 289         }
 290
 291         template <class T>
 292         inline std::size_t hash_value_unsigned(T val)
 293         {
 294              const unsigned int size_t_bits = std::numeric_limits<std::size_t>::digits;
 295              // ceiling(std::numeric_limits<T>::digits / size_t_bits) - 1
 296              const int length = (std::numeric_limits<T>::digits - 1)
 297                  / static_cast<int>(size_t_bits);
 298
 299              std::size_t seed = 0;
 300
 301              // Hopefully, this loop can be unrolled.
 302              for(unsigned int i = length * size_t_bits; i > 0; i -= size_t_bits)
 303              {
 304                  seed ^= (std::size_t) (val >> i) + (seed<<6) + (seed>>2);
 305              }
 306              seed ^= (std::size_t) val + (seed<<6) + (seed>>2);
 307
 308              return seed;
 309         }
 310
 311         template<std::size_t Bits> struct hash_combine_impl
 312         {
 313             template <typename SizeT>
 314             inline static SizeT fn(SizeT seed, SizeT value)
 315             {
 316                 seed ^= value + 0x9e3779b9 + (seed<<6) + (seed>>2);
 317                 return seed;
 318             }
 319         };
 320
 321         template<> struct hash_combine_impl<32>
 322         {
 323             inline static boost::uint32_t fn(boost::uint32_t h1, boost::uint32_t k1)
 324             {
 325                 const boost::uint32_t c1 = 0xcc9e2d51;
 326                 const boost::uint32_t c2 = 0x1b873593;
 327
 328                 k1 *= c1;
 329                 k1 = BOOST_FUNCTIONAL_HASH_ROTL32(k1,15);
 330                 k1 *= c2;
 331
 332                 h1 ^= k1;
 333                 h1 = BOOST_FUNCTIONAL_HASH_ROTL32(h1,13);
 334                 h1 = h1*5+0xe6546b64;
 335
 336                 return h1;
 337             }
 338         };
 339
 340         template<> struct hash_combine_impl<64>
 341         {
 342             inline static boost::uint64_t fn(boost::uint64_t h, boost::uint64_t k)
 343             {
 344                 const boost::uint64_t m = (boost::uint64_t(0xc6a4a793) << 32) + 0x5bd1e995;
 345                 const int r = 47;
 346
 347                 k *= m;
 348                 k ^= k >> r;
 349                 k *= m;
 350
 351                 h ^= k;
 352                 h *= m;
 353
 354                 // Completely arbitrary number, to prevent 0's
 355                 // from hashing to 0.
 356                 h += 0xe6546b64;
 357
 358                 return h;
 359             }
 360         };
 361     }
 362
 363     template <typename T>
 364     typename boost::hash_detail::basic_numbers<T>::type hash_value(T v)
 365     {
 366         return static_cast<std::size_t>(v);
 367     }
 368
 369     template <typename T>
 370     typename boost::hash_detail::long_numbers<T>::type hash_value(T v)
 371     {
 372         return hash_detail::hash_value_signed(v);
 373     }
 374
 375     template <typename T>
 376     typename boost::hash_detail::ulong_numbers<T>::type hash_value(T v)
 377     {
 378         return hash_detail::hash_value_unsigned(v);
 379     }
 380
 381     template <typename T>
 382     typename boost::enable_if<boost::is_enum<T>, std::size_t>::type
 383         hash_value(T v)
 384     {
 385         return static_cast<std::size_t>(v);
 386     }
 387
 388     // Implementation by Alberto Barbati and Dave Harris.
 389 #if !BOOST_WORKAROUND(__DMC__, <= 0x848)
 390     template <class T> std::size_t hash_value(T* const& v)
 391 #else
 392     template <class T> std::size_t hash_value(T* v)
 393 #endif
 394     {
 395 #if defined(__VMS) && __INITIAL_POINTER_SIZE == 64
 396     // for some reason ptrdiff_t on OpenVMS compiler with
 397     // 64 bit is not 64 bit !!!
 398         std::size_t x = static_cast<std::size_t>(
 399            reinterpret_cast<long long int>(v));
 400 #else
 401         std::size_t x = static_cast<std::size_t>(
 402            reinterpret_cast<std::ptrdiff_t>(v));
 403 #endif
 404         return x + (x >> 3);
 405     }
 406
 407 #if defined(BOOST_MSVC)
 408 #pragma warning(push)
 409 #if BOOST_MSVC <= 1400
 410 #pragma warning(disable:4267) // 'argument' : conversion from 'size_t' to
 411                               // 'unsigned int', possible loss of data
 412                               // A misguided attempt to detect 64-bit
 413                               // incompatability.
 414 #endif
 415 #endif
 416
 417     template <class T>
 418     inline void hash_combine(std::size_t& seed, T const& v)
 419     {
 420         boost::hash<T> hasher;
 421         seed = boost::hash_detail::hash_combine_impl<sizeof(std::size_t) * CHAR_BIT>::fn(seed, hasher(v));
 422     }
 423
 424 #if defined(BOOST_MSVC)
 425 #pragma warning(pop)
 426 #endif
 427
 428     template <class It>
 429     inline std::size_t hash_range(It first, It last)
 430     {
 431         std::size_t seed = 0;
 432
 433         for(; first != last; ++first)
 434         {
 435             hash_combine<typename std::iterator_traits<It>::value_type>(seed, *first);
 436         }
 437
 438         return seed;
 439     }
 440
 441     template <class It>
 442     inline void hash_range(std::size_t& seed, It first, It last)
 443     {
 444         for(; first != last; ++first)
 445         {
 446             hash_combine<typename std::iterator_traits<It>::value_type>(seed, *first);
 447         }
 448     }
 449
 450 #if BOOST_WORKAROUND(BOOST_BORLANDC, BOOST_TESTED_AT(0x551))
 451     template <class T>
 452     inline std::size_t hash_range(T* first, T* last)
 453     {
 454         std::size_t seed = 0;
 455
 456         for(; first != last; ++first)
 457         {
 458             boost::hash<T> hasher;
 459             seed ^= hasher(*first) + 0x9e3779b9 + (seed<<6) + (seed>>2);
 460         }
 461
 462         return seed;
 463     }
 464
 465     template <class T>
 466     inline void hash_range(std::size_t& seed, T* first, T* last)
 467     {
 468         for(; first != last; ++first)
 469         {
 470             boost::hash<T> hasher;
 471             seed ^= hasher(*first) + 0x9e3779b9 + (seed<<6) + (seed>>2);
 472         }
 473     }
 474 #endif
 475
 476 #if !defined(BOOST_NO_FUNCTION_TEMPLATE_ORDERING)
 477     template< class T, unsigned N >
 478     inline std::size_t hash_value(const T (&x)[N])
 479     {
 480         return hash_range(x, x + N);
 481     }
 482
 483     template< class T, unsigned N >
 484     inline std::size_t hash_value(T (&x)[N])
 485     {
 486         return hash_range(x, x + N);
 487     }
 488 #endif
 489
 490     template <class Ch, class A>
 491     inline std::size_t hash_value(
 492         std::basic_string<Ch, std::BOOST_HASH_CHAR_TRAITS<Ch>, A> const& v)
 493     {
 494         return hash_range(v.begin(), v.end());
 495     }
 496
 497 #if BOOST_HASH_HAS_STRING_VIEW
 498     template <class Ch>
 499     inline std::size_t hash_value(
 500         std::basic_string_view<Ch, std::BOOST_HASH_CHAR_TRAITS<Ch> > const& v)
 501     {
 502         return hash_range(v.begin(), v.end());
 503     }
 504 #endif
 505
 506     template <typename T>
 507     typename boost::hash_detail::float_numbers<T>::type hash_value(T v)
 508     {
 509         return boost::hash_detail::float_hash_value(v);
 510     }
 511
 512 #if BOOST_HASH_HAS_OPTIONAL
 513     template <typename T>
 514     inline std::size_t hash_value(std::optional<T> const& v) {
 515         if (!v) {
 516             // Arbitray value for empty optional.
 517             return 0x12345678;
 518         } else {
 519             boost::hash<T> hf;
 520             return hf(*v);
 521         }
 522     }
 523 #endif
 524
 525 #if BOOST_HASH_HAS_VARIANT
 526     inline std::size_t hash_value(std::monostate) {
 527         return 0x87654321;
 528     }
 529
 530     template <typename... Types>
 531     inline std::size_t hash_value(std::variant<Types...> const& v) {
 532         std::size_t seed = 0;
 533         hash_combine(seed, v.index());
 534         std::visit([&seed](auto&& x) { hash_combine(seed, x); }, v);
 535         return seed;
 536     }
 537 #endif
 538
 539
 540 #if !defined(BOOST_NO_CXX11_HDR_TYPEINDEX)
 541     inline std::size_t hash_value(std::type_index v)
 542     {
 543         return v.hash_code();
 544     }
 545 #endif
 546
 547 #if !defined(BOOST_NO_CXX11_HDR_SYSTEM_ERROR)
 548     inline std::size_t hash_value(std::error_code const& v) {
 549         std::size_t seed = 0;
 550         hash_combine(seed, v.value());
 551         hash_combine(seed, &v.category());
 552         return seed;
 553     }
 554
 555     inline std::size_t hash_value(std::error_condition const& v) {
 556         std::size_t seed = 0;
 557         hash_combine(seed, v.value());
 558         hash_combine(seed, &v.category());
 559         return seed;
 560     }
 561 #endif
 562
 563     //
 564     // boost::hash
 565     //
 566
 567     // Define the specializations required by the standard. The general purpose
 568     // boost::hash is defined later in extensions.hpp if
 569     // BOOST_HASH_NO_EXTENSIONS is not defined.
 570
 571     // BOOST_HASH_SPECIALIZE - define a specialization for a type which is
 572     // passed by copy.
 573     //
 574     // BOOST_HASH_SPECIALIZE_REF - define a specialization for a type which is
 575     // passed by const reference.
 576     //
 577     // These are undefined later.
 578
 579 #define BOOST_HASH_SPECIALIZE(type) \
 580     template <> struct hash<type> \
 581          : public boost::hash_detail::hash_base<type> \
 582     { \
 583         std::size_t operator()(type v) const \
 584         { \
 585             return boost::hash_value(v); \
 586         } \
 587     };
 588
 589 #define BOOST_HASH_SPECIALIZE_REF(type) \
 590     template <> struct hash<type> \
 591          : public boost::hash_detail::hash_base<type> \
 592     { \
 593         std::size_t operator()(type const& v) const \
 594         { \
 595             return boost::hash_value(v); \
 596         } \
 597     };
 598
 599 #define BOOST_HASH_SPECIALIZE_TEMPLATE_REF(type) \
 600     struct hash<type> \
 601          : public boost::hash_detail::hash_base<type> \
 602     { \
 603         std::size_t operator()(type const& v) const \
 604         { \
 605             return boost::hash_value(v); \
 606         } \
 607     };
 608
 609     BOOST_HASH_SPECIALIZE(bool)
 610     BOOST_HASH_SPECIALIZE(char)
 611     BOOST_HASH_SPECIALIZE(signed char)
 612     BOOST_HASH_SPECIALIZE(unsigned char)
 613 #if !defined(BOOST_NO_INTRINSIC_WCHAR_T)
 614     BOOST_HASH_SPECIALIZE(wchar_t)
 615 #endif
 616 #if !defined(BOOST_NO_CXX11_CHAR16_T)
 617     BOOST_HASH_SPECIALIZE(char16_t)
 618 #endif
 619 #if !defined(BOOST_NO_CXX11_CHAR32_T)
 620     BOOST_HASH_SPECIALIZE(char32_t)
 621 #endif
 622     BOOST_HASH_SPECIALIZE(short)
 623     BOOST_HASH_SPECIALIZE(unsigned short)
 624     BOOST_HASH_SPECIALIZE(int)
 625     BOOST_HASH_SPECIALIZE(unsigned int)
 626     BOOST_HASH_SPECIALIZE(long)
 627     BOOST_HASH_SPECIALIZE(unsigned long)
 628
 629     BOOST_HASH_SPECIALIZE(float)
 630     BOOST_HASH_SPECIALIZE(double)
 631     BOOST_HASH_SPECIALIZE(long double)
 632
 633     BOOST_HASH_SPECIALIZE_REF(std::string)
 634 #if !defined(BOOST_NO_STD_WSTRING) && !defined(BOOST_NO_INTRINSIC_WCHAR_T)
 635     BOOST_HASH_SPECIALIZE_REF(std::wstring)
 636 #endif
 637 #if !defined(BOOST_NO_CXX11_CHAR16_T)
 638     BOOST_HASH_SPECIALIZE_REF(std::basic_string<char16_t>)
 639 #endif
 640 #if !defined(BOOST_NO_CXX11_CHAR32_T)
 641     BOOST_HASH_SPECIALIZE_REF(std::basic_string<char32_t>)
 642 #endif
 643
 644 #if BOOST_HASH_HAS_STRING_VIEW
 645     BOOST_HASH_SPECIALIZE_REF(std::string_view)
 646 #   if !defined(BOOST_NO_STD_WSTRING) && !defined(BOOST_NO_INTRINSIC_WCHAR_T)
 647     BOOST_HASH_SPECIALIZE_REF(std::wstring_view)
 648 #   endif
 649 #   if !defined(BOOST_NO_CXX11_CHAR16_T)
 650     BOOST_HASH_SPECIALIZE_REF(std::basic_string_view<char16_t>)
 651 #   endif
 652 #   if !defined(BOOST_NO_CXX11_CHAR32_T)
 653     BOOST_HASH_SPECIALIZE_REF(std::basic_string_view<char32_t>)
 654 #   endif
 655 #endif
 656
 657 #if !defined(BOOST_NO_LONG_LONG)
 658     BOOST_HASH_SPECIALIZE(boost::long_long_type)
 659     BOOST_HASH_SPECIALIZE(boost::ulong_long_type)
 660 #endif
 661
 662 #if defined(BOOST_HAS_INT128)
 663     BOOST_HASH_SPECIALIZE(boost::int128_type)
 664     BOOST_HASH_SPECIALIZE(boost::uint128_type)
 665 #endif
 666
 667 #if BOOST_HASH_HAS_OPTIONAL
 668     template <typename T>
 669     BOOST_HASH_SPECIALIZE_TEMPLATE_REF(std::optional<T>)
 670 #endif
 671
 672 #if !defined(BOOST_HASH_HAS_VARIANT)
 673     template <typename... T>
 674     BOOST_HASH_SPECIALIZE_TEMPLATE_REF(std::variant<T...>)
 675     BOOST_HASH_SPECIALIZE(std::monostate)
 676 #endif
 677
 678 #if !defined(BOOST_NO_CXX11_HDR_TYPEINDEX)
 679     BOOST_HASH_SPECIALIZE(std::type_index)
 680 #endif
 681
 682 #undef BOOST_HASH_SPECIALIZE
 683 #undef BOOST_HASH_SPECIALIZE_REF
 684 #undef BOOST_HASH_SPECIALIZE_TEMPLATE_REF
 685
 686 // Specializing boost::hash for pointers.
 687
 688 #if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
 689
 690     template <class T>
 691     struct hash<T*>
 692         : public boost::hash_detail::hash_base<T*>
 693     {
 694         std::size_t operator()(T* v) const
 695         {
 696 #if !BOOST_WORKAROUND(__SUNPRO_CC, <= 0x590)
 697             return boost::hash_value(v);
 698 #else
 699             std::size_t x = static_cast<std::size_t>(
 700                 reinterpret_cast<std::ptrdiff_t>(v));
 701
 702             return x + (x >> 3);
 703 #endif
 704         }
 705     };
 706
 707 #else
 708
 709     // For compilers without partial specialization, we define a
 710     // boost::hash for all remaining types. But hash_impl is only defined
 711     // for pointers in 'extensions.hpp' - so when BOOST_HASH_NO_EXTENSIONS
 712     // is defined there will still be a compile error for types not supported
 713     // in the standard.
 714
 715     namespace hash_detail
 716     {
 717         template <bool IsPointer>
 718         struct hash_impl;
 719
 720         template <>
 721         struct hash_impl<true>
 722         {
 723             template <class T>
 724             struct inner
 725                 : public boost::hash_detail::hash_base<T>
 726             {
 727                 std::size_t operator()(T val) const
 728                 {
 729 #if !BOOST_WORKAROUND(__SUNPRO_CC, <= 590)
 730                     return boost::hash_value(val);
 731 #else
 732                     std::size_t x = static_cast<std::size_t>(
 733                         reinterpret_cast<std::ptrdiff_t>(val));
 734
 735                     return x + (x >> 3);
 736 #endif
 737                 }
 738             };
 739         };
 740     }
 741
 742     template <class T> struct hash
 743         : public boost::hash_detail::hash_impl<boost::is_pointer<T>::value>
 744             ::BOOST_NESTED_TEMPLATE inner<T>
 745     {
 746     };
 747
 748 #endif
 749 }
 750
 751 #undef BOOST_HASH_CHAR_TRAITS
 752 #undef BOOST_FUNCTIONAL_HASH_ROTL32
 753
 754 #if defined(BOOST_MSVC)
 755 #pragma warning(pop)
 756 #endif
 757
 758 #endif // BOOST_FUNCTIONAL_HASH_HASH_HPP
 759
 760 // Include this outside of the include guards in case the file is included
 761 // twice - once with BOOST_HASH_NO_EXTENSIONS defined, and then with it
 762 // undefined.
 763
 764 #if !defined(BOOST_HASH_NO_EXTENSIONS) \
 765     && !defined(BOOST_FUNCTIONAL_HASH_EXTENSIONS_HPP)
 766 #include <boost/container_hash/extensions.hpp>
 767 #endif