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 30 #if defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION) 31 #include <boost/type_traits/is_pointer.hpp> 32 #endif 33 34 #if !defined(BOOST_NO_CXX11_HDR_TYPEINDEX) 35 #include <typeindex> 36 #endif 37 38 #if !defined(BOOST_NO_CXX11_HDR_SYSTEM_ERROR) 39 #include <system_error> 40 #endif 41 42 #if defined(BOOST_MSVC) 43 #pragma warning(push) 44 45 #if BOOST_MSVC >= 1400 46 #pragma warning(disable:6295) // Ill-defined for-loop : 'unsigned int' values 47 // are always of range '0' to '4294967295'. 48 // Loop executes infinitely. 49 #endif 50 51 #endif 52 53 #if BOOST_WORKAROUND(__GNUC__, < 3) \ 54 && !defined(__SGI_STL_PORT) && !defined(_STLPORT_VERSION) 55 #define BOOST_HASH_CHAR_TRAITS string_char_traits 56 #else 57 #define BOOST_HASH_CHAR_TRAITS char_traits 58 #endif 59 60 #if defined(_MSC_VER) 61 # define BOOST_FUNCTIONAL_HASH_ROTL32(x, r) _rotl(x,r) 62 #else 63 # define BOOST_FUNCTIONAL_HASH_ROTL32(x, r) (x << r) | (x >> (32 - r)) 64 #endif 65 66 // Detect whether standard library has C++17 headers 67 68 #if !defined(BOOST_HASH_CXX17) 69 # if defined(BOOST_MSVC) 70 # if defined(_HAS_CXX17) && _HAS_CXX17 71 # define BOOST_HASH_CXX17 1 72 # endif 73 # elif defined(__cplusplus) && __cplusplus >= 201703 74 # define BOOST_HASH_CXX17 1 75 # endif 76 #endif 77 78 #if !defined(BOOST_HASH_CXX17) 79 # define BOOST_HASH_CXX17 0 80 #endif 81 82 #if BOOST_HASH_CXX17 && defined(__has_include) 83 # if !defined(BOOST_HASH_HAS_STRING_VIEW) && __has_include(<string_view>) 84 # define BOOST_HASH_HAS_STRING_VIEW 1 85 # endif 86 # if !defined(BOOST_HASH_HAS_OPTIONAL) && __has_include(<optional>) 87 # define BOOST_HASH_HAS_OPTIONAL 1 88 # endif 89 # if !defined(BOOST_HASH_HAS_VARIANT) && __has_include(<variant>) 90 # define BOOST_HASH_HAS_VARIANT 1 91 # endif 92 #endif 93 94 #if !defined(BOOST_HASH_HAS_STRING_VIEW) 95 # define BOOST_HASH_HAS_STRING_VIEW 0 96 #endif 97 98 #if !defined(BOOST_HASH_HAS_OPTIONAL) 99 # define BOOST_HASH_HAS_OPTIONAL 0 100 #endif 101 102 #if !defined(BOOST_HASH_HAS_VARIANT) 103 # define BOOST_HASH_HAS_VARIANT 0 104 #endif 105 106 #if BOOST_HASH_HAS_STRING_VIEW 107 # include <string_view> 108 #endif 109 110 #if BOOST_HASH_HAS_OPTIONAL 111 # include <optional> 112 #endif 113 114 #if BOOST_HASH_HAS_VARIANT 115 # include <variant> 116 #endif 117 118 namespace boost 119 { 120 namespace hash_detail 121 { 122 #if defined(BOOST_NO_CXX98_FUNCTION_BASE) 123 template <typename T> 124 struct hash_base 125 { 126 typedef T argument_type; 127 typedef std::size_t result_type; 128 }; 129 #else 130 template <typename T> 131 struct hash_base : std::unary_function<T, std::size_t> {}; 132 #endif 133 134 struct enable_hash_value { typedef std::size_t type; }; 135 136 template <typename T> struct basic_numbers {}; 137 template <typename T> struct long_numbers; 138 template <typename T> struct ulong_numbers; 139 template <typename T> struct float_numbers {}; 140 141 template <> struct basic_numbers<bool> : 142 boost::hash_detail::enable_hash_value {}; 143 template <> struct basic_numbers<char> : 144 boost::hash_detail::enable_hash_value {}; 145 template <> struct basic_numbers<unsigned char> : 146 boost::hash_detail::enable_hash_value {}; 147 template <> struct basic_numbers<signed char> : 148 boost::hash_detail::enable_hash_value {}; 149 template <> struct basic_numbers<short> : 150 boost::hash_detail::enable_hash_value {}; 151 template <> struct basic_numbers<unsigned short> : 152 boost::hash_detail::enable_hash_value {}; 153 template <> struct basic_numbers<int> : 154 boost::hash_detail::enable_hash_value {}; 155 template <> struct basic_numbers<unsigned int> : 156 boost::hash_detail::enable_hash_value {}; 157 template <> struct basic_numbers<long> : 158 boost::hash_detail::enable_hash_value {}; 159 template <> struct basic_numbers<unsigned long> : 160 boost::hash_detail::enable_hash_value {}; 161 162 #if !defined(BOOST_NO_INTRINSIC_WCHAR_T) 163 template <> struct basic_numbers<wchar_t> : 164 boost::hash_detail::enable_hash_value {}; 165 #endif 166 167 #if !defined(BOOST_NO_CXX11_CHAR16_T) 168 template <> struct basic_numbers<char16_t> : 169 boost::hash_detail::enable_hash_value {}; 170 #endif 171 172 #if !defined(BOOST_NO_CXX11_CHAR32_T) 173 template <> struct basic_numbers<char32_t> : 174 boost::hash_detail::enable_hash_value {}; 175 #endif 176 177 // long_numbers is defined like this to allow for separate 178 // specialization for long_long and int128_type, in case 179 // they conflict. 180 template <typename T> struct long_numbers2 {}; 181 template <typename T> struct ulong_numbers2 {}; 182 template <typename T> struct long_numbers : long_numbers2<T> {}; 183 template <typename T> struct ulong_numbers : ulong_numbers2<T> {}; 184 185 #if !defined(BOOST_NO_LONG_LONG) 186 template <> struct long_numbers<boost::long_long_type> : 187 boost::hash_detail::enable_hash_value {}; 188 template <> struct ulong_numbers<boost::ulong_long_type> : 189 boost::hash_detail::enable_hash_value {}; 190 #endif 191 192 #if defined(BOOST_HAS_INT128) 193 template <> struct long_numbers2<boost::int128_type> : 194 boost::hash_detail::enable_hash_value {}; 195 template <> struct ulong_numbers2<boost::uint128_type> : 196 boost::hash_detail::enable_hash_value {}; 197 #endif 198 199 template <> struct float_numbers<float> : 200 boost::hash_detail::enable_hash_value {}; 201 template <> struct float_numbers<double> : 202 boost::hash_detail::enable_hash_value {}; 203 template <> struct float_numbers<long double> : 204 boost::hash_detail::enable_hash_value {}; 205 } 206 207 template <typename T> 208 typename boost::hash_detail::basic_numbers<T>::type hash_value(T); 209 template <typename T> 210 typename boost::hash_detail::long_numbers<T>::type hash_value(T); 211 template <typename T> 212 typename boost::hash_detail::ulong_numbers<T>::type hash_value(T); 213 214 template <typename T> 215 typename boost::enable_if<boost::is_enum<T>, std::size_t>::type 216 hash_value(T); 217 218 #if !BOOST_WORKAROUND(__DMC__, <= 0x848) 219 template <class T> std::size_t hash_value(T* const&); 220 #else 221 template <class T> std::size_t hash_value(T*); 222 #endif 223 224 #if !defined(BOOST_NO_FUNCTION_TEMPLATE_ORDERING) 225 template< class T, unsigned N > 226 std::size_t hash_value(const T (&x)[N]); 227 228 template< class T, unsigned N > 229 std::size_t hash_value(T (&x)[N]); 230 #endif 231 232 template <class Ch, class A> 233 std::size_t hash_value( 234 std::basic_string<Ch, std::BOOST_HASH_CHAR_TRAITS<Ch>, A> const&); 235 236 #if BOOST_HASH_HAS_STRING_VIEW 237 template <class Ch> 238 std::size_t hash_value( 239 std::basic_string_view<Ch, std::BOOST_HASH_CHAR_TRAITS<Ch> > const&); 240 #endif 241 242 template <typename T> 243 typename boost::hash_detail::float_numbers<T>::type hash_value(T); 244 245 #if BOOST_HASH_HAS_OPTIONAL 246 template <typename T> 247 std::size_t hash_value(std::optional<T> const&); 248 #endif 249 250 #if BOOST_HASH_HAS_VARIANT 251 std::size_t hash_value(std::monostate); 252 template <typename... Types> 253 std::size_t hash_value(std::variant<Types...> const&); 254 #endif 255 256 #if !defined(BOOST_NO_CXX11_HDR_TYPEINDEX) 257 std::size_t hash_value(std::type_index); 258 #endif 259 260 #if !defined(BOOST_NO_CXX11_HDR_SYSTEM_ERROR) 261 std::size_t hash_value(std::error_code const&); 262 std::size_t hash_value(std::error_condition const&); 263 #endif 264 265 // Implementation 266 267 namespace hash_detail 268 { 269 template <class T> hash_value_signed(T val)270 inline std::size_t hash_value_signed(T val) 271 { 272 const unsigned int size_t_bits = std::numeric_limits<std::size_t>::digits; 273 // ceiling(std::numeric_limits<T>::digits / size_t_bits) - 1 274 const int length = (std::numeric_limits<T>::digits - 1) 275 / static_cast<int>(size_t_bits); 276 277 std::size_t seed = 0; 278 T positive = val < 0 ? -1 - val : val; 279 280 // Hopefully, this loop can be unrolled. 281 for(unsigned int i = length * size_t_bits; i > 0; i -= size_t_bits) 282 { 283 seed ^= (std::size_t) (positive >> i) + (seed<<6) + (seed>>2); 284 } 285 seed ^= (std::size_t) val + (seed<<6) + (seed>>2); 286 287 return seed; 288 } 289 290 template <class T> hash_value_unsigned(T val)291 inline std::size_t hash_value_unsigned(T val) 292 { 293 const unsigned int size_t_bits = std::numeric_limits<std::size_t>::digits; 294 // ceiling(std::numeric_limits<T>::digits / size_t_bits) - 1 295 const int length = (std::numeric_limits<T>::digits - 1) 296 / static_cast<int>(size_t_bits); 297 298 std::size_t seed = 0; 299 300 // Hopefully, this loop can be unrolled. 301 for(unsigned int i = length * size_t_bits; i > 0; i -= size_t_bits) 302 { 303 seed ^= (std::size_t) (val >> i) + (seed<<6) + (seed>>2); 304 } 305 seed ^= (std::size_t) val + (seed<<6) + (seed>>2); 306 307 return seed; 308 } 309 310 template <typename SizeT> hash_combine_impl(SizeT & seed,SizeT value)311 inline void hash_combine_impl(SizeT& seed, SizeT value) 312 { 313 seed ^= value + 0x9e3779b9 + (seed<<6) + (seed>>2); 314 } 315 hash_combine_impl(boost::uint32_t & h1,boost::uint32_t k1)316 inline void hash_combine_impl(boost::uint32_t& h1, 317 boost::uint32_t k1) 318 { 319 const uint32_t c1 = 0xcc9e2d51; 320 const uint32_t c2 = 0x1b873593; 321 322 k1 *= c1; 323 k1 = BOOST_FUNCTIONAL_HASH_ROTL32(k1,15); 324 k1 *= c2; 325 326 h1 ^= k1; 327 h1 = BOOST_FUNCTIONAL_HASH_ROTL32(h1,13); 328 h1 = h1*5+0xe6546b64; 329 } 330 331 332 // Don't define 64-bit hash combine on platforms without 64 bit integers, 333 // and also not for 32-bit gcc as it warns about the 64-bit constant. 334 #if !defined(BOOST_NO_INT64_T) && \ 335 !(defined(__GNUC__) && ULONG_MAX == 0xffffffff) 336 hash_combine_impl(boost::uint64_t & h,boost::uint64_t k)337 inline void hash_combine_impl(boost::uint64_t& h, 338 boost::uint64_t k) 339 { 340 const boost::uint64_t m = UINT64_C(0xc6a4a7935bd1e995); 341 const int r = 47; 342 343 k *= m; 344 k ^= k >> r; 345 k *= m; 346 347 h ^= k; 348 h *= m; 349 350 // Completely arbitrary number, to prevent 0's 351 // from hashing to 0. 352 h += 0xe6546b64; 353 } 354 355 #endif // BOOST_NO_INT64_T 356 } 357 358 template <typename T> hash_value(T v)359 typename boost::hash_detail::basic_numbers<T>::type hash_value(T v) 360 { 361 return static_cast<std::size_t>(v); 362 } 363 364 template <typename T> hash_value(T v)365 typename boost::hash_detail::long_numbers<T>::type hash_value(T v) 366 { 367 return hash_detail::hash_value_signed(v); 368 } 369 370 template <typename T> hash_value(T v)371 typename boost::hash_detail::ulong_numbers<T>::type hash_value(T v) 372 { 373 return hash_detail::hash_value_unsigned(v); 374 } 375 376 template <typename T> 377 typename boost::enable_if<boost::is_enum<T>, std::size_t>::type hash_value(T v)378 hash_value(T v) 379 { 380 return static_cast<std::size_t>(v); 381 } 382 383 // Implementation by Alberto Barbati and Dave Harris. 384 #if !BOOST_WORKAROUND(__DMC__, <= 0x848) hash_value(T * const & v)385 template <class T> std::size_t hash_value(T* const& v) 386 #else 387 template <class T> std::size_t hash_value(T* v) 388 #endif 389 { 390 #if defined(__VMS) && __INITIAL_POINTER_SIZE == 64 391 // for some reason ptrdiff_t on OpenVMS compiler with 392 // 64 bit is not 64 bit !!! 393 std::size_t x = static_cast<std::size_t>( 394 reinterpret_cast<long long int>(v)); 395 #else 396 std::size_t x = static_cast<std::size_t>( 397 reinterpret_cast<std::ptrdiff_t>(v)); 398 #endif 399 return x + (x >> 3); 400 } 401 402 #if defined(BOOST_MSVC) 403 #pragma warning(push) 404 #if BOOST_MSVC <= 1400 405 #pragma warning(disable:4267) // 'argument' : conversion from 'size_t' to 406 // 'unsigned int', possible loss of data 407 // A misguided attempt to detect 64-bit 408 // incompatability. 409 #endif 410 #endif 411 412 template <class T> hash_combine(std::size_t & seed,T const & v)413 inline void hash_combine(std::size_t& seed, T const& v) 414 { 415 boost::hash<T> hasher; 416 return boost::hash_detail::hash_combine_impl(seed, hasher(v)); 417 } 418 419 #if defined(BOOST_MSVC) 420 #pragma warning(pop) 421 #endif 422 423 template <class It> hash_range(It first,It last)424 inline std::size_t hash_range(It first, It last) 425 { 426 std::size_t seed = 0; 427 428 for(; first != last; ++first) 429 { 430 hash_combine<typename std::iterator_traits<It>::value_type>(seed, *first); 431 } 432 433 return seed; 434 } 435 436 template <class It> hash_range(std::size_t & seed,It first,It last)437 inline void hash_range(std::size_t& seed, It first, It last) 438 { 439 for(; first != last; ++first) 440 { 441 hash_combine<typename std::iterator_traits<It>::value_type>(seed, *first); 442 } 443 } 444 445 #if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x551)) 446 template <class T> hash_range(T * first,T * last)447 inline std::size_t hash_range(T* first, T* last) 448 { 449 std::size_t seed = 0; 450 451 for(; first != last; ++first) 452 { 453 boost::hash<T> hasher; 454 seed ^= hasher(*first) + 0x9e3779b9 + (seed<<6) + (seed>>2); 455 } 456 457 return seed; 458 } 459 460 template <class T> hash_range(std::size_t & seed,T * first,T * last)461 inline void hash_range(std::size_t& seed, T* first, T* last) 462 { 463 for(; first != last; ++first) 464 { 465 boost::hash<T> hasher; 466 seed ^= hasher(*first) + 0x9e3779b9 + (seed<<6) + (seed>>2); 467 } 468 } 469 #endif 470 471 #if !defined(BOOST_NO_FUNCTION_TEMPLATE_ORDERING) 472 template< class T, unsigned N > hash_value(const T (& x)[N])473 inline std::size_t hash_value(const T (&x)[N]) 474 { 475 return hash_range(x, x + N); 476 } 477 478 template< class T, unsigned N > hash_value(T (& x)[N])479 inline std::size_t hash_value(T (&x)[N]) 480 { 481 return hash_range(x, x + N); 482 } 483 #endif 484 485 template <class Ch, class A> hash_value(std::basic_string<Ch,std::BOOST_HASH_CHAR_TRAITS<Ch>,A> const & v)486 inline std::size_t hash_value( 487 std::basic_string<Ch, std::BOOST_HASH_CHAR_TRAITS<Ch>, A> const& v) 488 { 489 return hash_range(v.begin(), v.end()); 490 } 491 492 #if BOOST_HASH_HAS_STRING_VIEW 493 template <class Ch> hash_value(std::basic_string_view<Ch,std::BOOST_HASH_CHAR_TRAITS<Ch>> const & v)494 inline std::size_t hash_value( 495 std::basic_string_view<Ch, std::BOOST_HASH_CHAR_TRAITS<Ch> > const& v) 496 { 497 return hash_range(v.begin(), v.end()); 498 } 499 #endif 500 501 template <typename T> hash_value(T v)502 typename boost::hash_detail::float_numbers<T>::type hash_value(T v) 503 { 504 return boost::hash_detail::float_hash_value(v); 505 } 506 507 #if BOOST_HASH_HAS_OPTIONAL 508 template <typename T> hash_value(std::optional<T> const & v)509 inline std::size_t hash_value(std::optional<T> const& v) { 510 if (!v) { 511 // Arbitray value for empty optional. 512 return 0x12345678; 513 } else { 514 boost::hash<T> hf; 515 return hf(*v); 516 } 517 } 518 #endif 519 520 #if BOOST_HASH_HAS_VARIANT hash_value(std::monostate)521 inline std::size_t hash_value(std::monostate) { 522 return 0x87654321; 523 } 524 525 template <typename... Types> hash_value(std::variant<Types...> const & v)526 inline std::size_t hash_value(std::variant<Types...> const& v) { 527 std::size_t seed = 0; 528 hash_combine(seed, v.index()); 529 std::visit([&seed](auto&& x) { hash_combine(seed, x); }, v); 530 return seed; 531 } 532 #endif 533 534 535 #if !defined(BOOST_NO_CXX11_HDR_TYPEINDEX) hash_value(std::type_index v)536 inline std::size_t hash_value(std::type_index v) 537 { 538 return v.hash_code(); 539 } 540 #endif 541 542 #if !defined(BOOST_NO_CXX11_HDR_SYSTEM_ERROR) hash_value(std::error_code const & v)543 inline std::size_t hash_value(std::error_code const& v) { 544 std::size_t seed = 0; 545 hash_combine(seed, v.value()); 546 hash_combine(seed, &v.category()); 547 return seed; 548 } 549 hash_value(std::error_condition const & v)550 inline std::size_t hash_value(std::error_condition const& v) { 551 std::size_t seed = 0; 552 hash_combine(seed, v.value()); 553 hash_combine(seed, &v.category()); 554 return seed; 555 } 556 #endif 557 558 // 559 // boost::hash 560 // 561 562 // Define the specializations required by the standard. The general purpose 563 // boost::hash is defined later in extensions.hpp if 564 // BOOST_HASH_NO_EXTENSIONS is not defined. 565 566 // BOOST_HASH_SPECIALIZE - define a specialization for a type which is 567 // passed by copy. 568 // 569 // BOOST_HASH_SPECIALIZE_REF - define a specialization for a type which is 570 // passed by const reference. 571 // 572 // These are undefined later. 573 574 #define BOOST_HASH_SPECIALIZE(type) \ 575 template <> struct hash<type> \ 576 : public boost::hash_detail::hash_base<type> \ 577 { \ 578 std::size_t operator()(type v) const \ 579 { \ 580 return boost::hash_value(v); \ 581 } \ 582 }; 583 584 #define BOOST_HASH_SPECIALIZE_REF(type) \ 585 template <> struct hash<type> \ 586 : public boost::hash_detail::hash_base<type> \ 587 { \ 588 std::size_t operator()(type const& v) const \ 589 { \ 590 return boost::hash_value(v); \ 591 } \ 592 }; 593 594 #define BOOST_HASH_SPECIALIZE_TEMPLATE_REF(type) \ 595 struct hash<type> \ 596 : public boost::hash_detail::hash_base<type> \ 597 { \ 598 std::size_t operator()(type const& v) const \ 599 { \ 600 return boost::hash_value(v); \ 601 } \ 602 }; 603 604 BOOST_HASH_SPECIALIZE(bool) 605 BOOST_HASH_SPECIALIZE(char) 606 BOOST_HASH_SPECIALIZE(signed char) 607 BOOST_HASH_SPECIALIZE(unsigned char) 608 #if !defined(BOOST_NO_INTRINSIC_WCHAR_T) 609 BOOST_HASH_SPECIALIZE(wchar_t) 610 #endif 611 #if !defined(BOOST_NO_CXX11_CHAR16_T) 612 BOOST_HASH_SPECIALIZE(char16_t) 613 #endif 614 #if !defined(BOOST_NO_CXX11_CHAR32_T) 615 BOOST_HASH_SPECIALIZE(char32_t) 616 #endif 617 BOOST_HASH_SPECIALIZE(short) 618 BOOST_HASH_SPECIALIZE(unsigned short) 619 BOOST_HASH_SPECIALIZE(int) 620 BOOST_HASH_SPECIALIZE(unsigned int) 621 BOOST_HASH_SPECIALIZE(long) 622 BOOST_HASH_SPECIALIZE(unsigned long) 623 624 BOOST_HASH_SPECIALIZE(float) 625 BOOST_HASH_SPECIALIZE(double) 626 BOOST_HASH_SPECIALIZE(long double) 627 628 BOOST_HASH_SPECIALIZE_REF(std::string) 629 #if !defined(BOOST_NO_STD_WSTRING) && !defined(BOOST_NO_INTRINSIC_WCHAR_T) 630 BOOST_HASH_SPECIALIZE_REF(std::wstring) 631 #endif 632 #if !defined(BOOST_NO_CXX11_CHAR16_T) 633 BOOST_HASH_SPECIALIZE_REF(std::basic_string<char16_t>) 634 #endif 635 #if !defined(BOOST_NO_CXX11_CHAR32_T) 636 BOOST_HASH_SPECIALIZE_REF(std::basic_string<char32_t>) 637 #endif 638 639 #if BOOST_HASH_HAS_STRING_VIEW 640 BOOST_HASH_SPECIALIZE_REF(std::string_view) 641 # if !defined(BOOST_NO_STD_WSTRING) && !defined(BOOST_NO_INTRINSIC_WCHAR_T) 642 BOOST_HASH_SPECIALIZE_REF(std::wstring_view) 643 # endif 644 # if !defined(BOOST_NO_CXX11_CHAR16_T) 645 BOOST_HASH_SPECIALIZE_REF(std::basic_string_view<char16_t>) 646 # endif 647 # if !defined(BOOST_NO_CXX11_CHAR32_T) 648 BOOST_HASH_SPECIALIZE_REF(std::basic_string_view<char32_t>) 649 # endif 650 #endif 651 652 #if !defined(BOOST_NO_LONG_LONG) 653 BOOST_HASH_SPECIALIZE(boost::long_long_type) 654 BOOST_HASH_SPECIALIZE(boost::ulong_long_type) 655 #endif 656 657 #if defined(BOOST_HAS_INT128) 658 BOOST_HASH_SPECIALIZE(boost::int128_type) 659 BOOST_HASH_SPECIALIZE(boost::uint128_type) 660 #endif 661 662 #if BOOST_HASH_HAS_OPTIONAL 663 template <typename T> 664 BOOST_HASH_SPECIALIZE_TEMPLATE_REF(std::optional<T>) 665 #endif 666 667 #if !defined(BOOST_HASH_HAS_VARIANT) 668 template <typename... T> 669 BOOST_HASH_SPECIALIZE_TEMPLATE_REF(std::variant<T...>) 670 BOOST_HASH_SPECIALIZE(std::monostate) 671 #endif 672 673 #if !defined(BOOST_NO_CXX11_HDR_TYPEINDEX) 674 BOOST_HASH_SPECIALIZE(std::type_index) 675 #endif 676 677 #undef BOOST_HASH_SPECIALIZE 678 #undef BOOST_HASH_SPECIALIZE_REF 679 #undef BOOST_HASH_SPECIALIZE_TEMPLATE_REF 680 681 // Specializing boost::hash for pointers. 682 683 #if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION) 684 685 template <class T> 686 struct hash<T*> 687 : public boost::hash_detail::hash_base<T*> 688 { operator ()boost::hash689 std::size_t operator()(T* v) const 690 { 691 #if !BOOST_WORKAROUND(__SUNPRO_CC, <= 0x590) 692 return boost::hash_value(v); 693 #else 694 std::size_t x = static_cast<std::size_t>( 695 reinterpret_cast<std::ptrdiff_t>(v)); 696 697 return x + (x >> 3); 698 #endif 699 } 700 }; 701 702 #else 703 704 // For compilers without partial specialization, we define a 705 // boost::hash for all remaining types. But hash_impl is only defined 706 // for pointers in 'extensions.hpp' - so when BOOST_HASH_NO_EXTENSIONS 707 // is defined there will still be a compile error for types not supported 708 // in the standard. 709 710 namespace hash_detail 711 { 712 template <bool IsPointer> 713 struct hash_impl; 714 715 template <> 716 struct hash_impl<true> 717 { 718 template <class T> 719 struct inner 720 : public boost::hash_detail::hash_base<T> 721 { 722 std::size_t operator()(T val) const 723 { 724 #if !BOOST_WORKAROUND(__SUNPRO_CC, <= 590) 725 return boost::hash_value(val); 726 #else 727 std::size_t x = static_cast<std::size_t>( 728 reinterpret_cast<std::ptrdiff_t>(val)); 729 730 return x + (x >> 3); 731 #endif 732 } 733 }; 734 }; 735 } 736 737 template <class T> struct hash 738 : public boost::hash_detail::hash_impl<boost::is_pointer<T>::value> 739 ::BOOST_NESTED_TEMPLATE inner<T> 740 { 741 }; 742 743 #endif 744 } 745 746 #undef BOOST_HASH_CHAR_TRAITS 747 #undef BOOST_FUNCTIONAL_HASH_ROTL32 748 749 #if defined(BOOST_MSVC) 750 #pragma warning(pop) 751 #endif 752 753 #endif // BOOST_FUNCTIONAL_HASH_HASH_HPP 754 755 // Include this outside of the include guards in case the file is included 756 // twice - once with BOOST_HASH_NO_EXTENSIONS defined, and then with it 757 // undefined. 758 759 #if !defined(BOOST_HASH_NO_EXTENSIONS) \ 760 && !defined(BOOST_FUNCTIONAL_HASH_EXTENSIONS_HPP) 761 #include <boost/container_hash/extensions.hpp> 762 #endif 763