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[ceph.git] / ceph / src / boost / libs / functional / include / boost / functional / hash / hash.hpp
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7c673cae
FG		 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/functional/hash/hash_fwd.hpp>
20#include <functional>
21#include <boost/functional/hash/detail/hash_float.hpp>
22#include <string>
23#include <boost/limits.hpp>
24#include <boost/type_traits/is_enum.hpp>
25#include <boost/type_traits/is_integral.hpp>
26#include <boost/utility/enable_if.hpp>
27#include <boost/cstdint.hpp>
28
29#if defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
30#include <boost/type_traits/is_pointer.hpp>
31#endif
32
33#if !defined(BOOST_NO_CXX11_HDR_TYPEINDEX)
34#include <typeindex>
35#endif
36
37#if defined(BOOST_MSVC)
38#pragma warning(push)
39
40#if BOOST_MSVC >= 1400
41#pragma warning(disable:6295) // Ill-defined for-loop : 'unsigned int' values
42 // are always of range '0' to '4294967295'.
43 // Loop executes infinitely.
44#endif
45
46#endif
47
48#if BOOST_WORKAROUND(__GNUC__, < 3) \
49 && !defined(__SGI_STL_PORT) && !defined(_STLPORT_VERSION)
50#define BOOST_HASH_CHAR_TRAITS string_char_traits
51#else
52#define BOOST_HASH_CHAR_TRAITS char_traits
53#endif
54
55#if defined(_MSC_VER)
56# define BOOST_FUNCTIONAL_HASH_ROTL32(x, r) _rotl(x,r)
57#else
58# define BOOST_FUNCTIONAL_HASH_ROTL32(x, r) (x << r) | (x >> (32 - r))
59#endif
60
61namespace boost
62{
63 namespace hash_detail
64 {
65 struct enable_hash_value { typedef std::size_t type; };
66
67 template <typename T> struct basic_numbers {};
68 template <typename T> struct long_numbers;
69 template <typename T> struct ulong_numbers;
70 template <typename T> struct float_numbers {};
71
72 template <> struct basic_numbers<bool> :
73 boost::hash_detail::enable_hash_value {};
74 template <> struct basic_numbers<char> :
75 boost::hash_detail::enable_hash_value {};
76 template <> struct basic_numbers<unsigned char> :
77 boost::hash_detail::enable_hash_value {};
78 template <> struct basic_numbers<signed char> :
79 boost::hash_detail::enable_hash_value {};
80 template <> struct basic_numbers<short> :
81 boost::hash_detail::enable_hash_value {};
82 template <> struct basic_numbers<unsigned short> :
83 boost::hash_detail::enable_hash_value {};
84 template <> struct basic_numbers<int> :
85 boost::hash_detail::enable_hash_value {};
86 template <> struct basic_numbers<unsigned int> :
87 boost::hash_detail::enable_hash_value {};
88 template <> struct basic_numbers<long> :
89 boost::hash_detail::enable_hash_value {};
90 template <> struct basic_numbers<unsigned long> :
91 boost::hash_detail::enable_hash_value {};
92
93#if !defined(BOOST_NO_INTRINSIC_WCHAR_T)
94 template <> struct basic_numbers<wchar_t> :
95 boost::hash_detail::enable_hash_value {};
96#endif
97
98 // long_numbers is defined like this to allow for separate
99 // specialization for long_long and int128_type, in case
100 // they conflict.
101 template <typename T> struct long_numbers2 {};
102 template <typename T> struct ulong_numbers2 {};
103 template <typename T> struct long_numbers : long_numbers2<T> {};
104 template <typename T> struct ulong_numbers : ulong_numbers2<T> {};
105
106#if !defined(BOOST_NO_LONG_LONG)
107 template <> struct long_numbers<boost::long_long_type> :
108 boost::hash_detail::enable_hash_value {};
109 template <> struct ulong_numbers<boost::ulong_long_type> :
110 boost::hash_detail::enable_hash_value {};
111#endif
112
113#if defined(BOOST_HAS_INT128)
114 template <> struct long_numbers2<boost::int128_type> :
115 boost::hash_detail::enable_hash_value {};
116 template <> struct ulong_numbers2<boost::uint128_type> :
117 boost::hash_detail::enable_hash_value {};
118#endif
119
120 template <> struct float_numbers<float> :
121 boost::hash_detail::enable_hash_value {};
122 template <> struct float_numbers<double> :
123 boost::hash_detail::enable_hash_value {};
124 template <> struct float_numbers<long double> :
125 boost::hash_detail::enable_hash_value {};
126 }
127
128 template <typename T>
129 typename boost::hash_detail::basic_numbers<T>::type hash_value(T);
130 template <typename T>
131 typename boost::hash_detail::long_numbers<T>::type hash_value(T);
132 template <typename T>
133 typename boost::hash_detail::ulong_numbers<T>::type hash_value(T);
134
135 template <typename T>
136 typename boost::enable_if<boost::is_enum<T>, std::size_t>::type
137 hash_value(T);
138
139#if !BOOST_WORKAROUND(__DMC__, <= 0x848)
140 template <class T> std::size_t hash_value(T* const&);
141#else
142 template <class T> std::size_t hash_value(T*);
143#endif
144
145#if !defined(BOOST_NO_FUNCTION_TEMPLATE_ORDERING)
146 template< class T, unsigned N >
147 std::size_t hash_value(const T (&x)[N]);
148
149 template< class T, unsigned N >
150 std::size_t hash_value(T (&x)[N]);
151#endif
152
153 template <class Ch, class A>
154 std::size_t hash_value(
155 std::basic_string<Ch, std::BOOST_HASH_CHAR_TRAITS<Ch>, A> const&);
156
157 template <typename T>
158 typename boost::hash_detail::float_numbers<T>::type hash_value(T);
159
160#if !defined(BOOST_NO_CXX11_HDR_TYPEINDEX)
161 std::size_t hash_value(std::type_index);
162#endif
163
164 // Implementation
165
166 namespace hash_detail
167 {
168 template <class T>
169 inline std::size_t hash_value_signed(T val)
170 {
171 const unsigned int size_t_bits = std::numeric_limits<std::size_t>::digits;
172 // ceiling(std::numeric_limits<T>::digits / size_t_bits) - 1
173 const int length = (std::numeric_limits<T>::digits - 1)
174 / static_cast<int>(size_t_bits);
175
176 std::size_t seed = 0;
177 T positive = val < 0 ? -1 - val : val;
178
179 // Hopefully, this loop can be unrolled.
180 for(unsigned int i = length * size_t_bits; i > 0; i -= size_t_bits)
181 {
182 seed ^= (std::size_t) (positive >> i) + (seed<<6) + (seed>>2);
183 }
184 seed ^= (std::size_t) val + (seed<<6) + (seed>>2);
185
186 return seed;
187 }
188
189 template <class T>
190 inline std::size_t hash_value_unsigned(T val)
191 {
192 const unsigned int size_t_bits = std::numeric_limits<std::size_t>::digits;
193 // ceiling(std::numeric_limits<T>::digits / size_t_bits) - 1
194 const int length = (std::numeric_limits<T>::digits - 1)
195 / static_cast<int>(size_t_bits);
196
197 std::size_t seed = 0;
198
199 // Hopefully, this loop can be unrolled.
200 for(unsigned int i = length * size_t_bits; i > 0; i -= size_t_bits)
201 {
202 seed ^= (std::size_t) (val >> i) + (seed<<6) + (seed>>2);
203 }
204 seed ^= (std::size_t) val + (seed<<6) + (seed>>2);
205
206 return seed;
207 }
208
209 template <typename SizeT>
210 inline void hash_combine_impl(SizeT& seed, SizeT value)
211 {
212 seed ^= value + 0x9e3779b9 + (seed<<6) + (seed>>2);
213 }
214
215 inline void hash_combine_impl(boost::uint32_t& h1,
216 boost::uint32_t k1)
217 {
218 const uint32_t c1 = 0xcc9e2d51;
219 const uint32_t c2 = 0x1b873593;
220
221 k1 *= c1;
222 k1 = BOOST_FUNCTIONAL_HASH_ROTL32(k1,15);
223 k1 *= c2;
224
225 h1 ^= k1;
226 h1 = BOOST_FUNCTIONAL_HASH_ROTL32(h1,13);
227 h1 = h1*5+0xe6546b64;
228 }
229
230
231// Don't define 64-bit hash combine on platforms without 64 bit integers,
232// and also not for 32-bit gcc as it warns about the 64-bit constant.
233#if !defined(BOOST_NO_INT64_T) && \
234 !(defined(__GNUC__) && ULONG_MAX == 0xffffffff)
235
236 inline void hash_combine_impl(boost::uint64_t& h,
237 boost::uint64_t k)
238 {
239 const boost::uint64_t m = UINT64_C(0xc6a4a7935bd1e995);
240 const int r = 47;
241
242 k *= m;
243 k ^= k >> r;
244 k *= m;
245
246 h ^= k;
247 h *= m;
248
249 // Completely arbitrary number, to prevent 0's
250 // from hashing to 0.
251 h += 0xe6546b64;
252 }
253
254#endif // BOOST_NO_INT64_T
255 }
256
257 template <typename T>
258 typename boost::hash_detail::basic_numbers<T>::type hash_value(T v)
259 {
260 return static_cast<std::size_t>(v);
261 }
262
263 template <typename T>
264 typename boost::hash_detail::long_numbers<T>::type hash_value(T v)
265 {
266 return hash_detail::hash_value_signed(v);
267 }
268
269 template <typename T>
270 typename boost::hash_detail::ulong_numbers<T>::type hash_value(T v)
271 {
272 return hash_detail::hash_value_unsigned(v);
273 }
274
275 template <typename T>
276 typename boost::enable_if<boost::is_enum<T>, std::size_t>::type
277 hash_value(T v)
278 {
279 return static_cast<std::size_t>(v);
280 }
281
282 // Implementation by Alberto Barbati and Dave Harris.
283#if !BOOST_WORKAROUND(__DMC__, <= 0x848)
284 template <class T> std::size_t hash_value(T* const& v)
285#else
286 template <class T> std::size_t hash_value(T* v)
287#endif
288 {
289#if defined(__VMS) && __INITIAL_POINTER_SIZE == 64
290 // for some reason ptrdiff_t on OpenVMS compiler with
291 // 64 bit is not 64 bit !!!
292 std::size_t x = static_cast<std::size_t>(
293 reinterpret_cast<long long int>(v));
294#else
295 std::size_t x = static_cast<std::size_t>(
296 reinterpret_cast<std::ptrdiff_t>(v));
297#endif
298 return x + (x >> 3);
299 }
300
301#if defined(BOOST_MSVC)
302#pragma warning(push)
303#if BOOST_MSVC <= 1400
304#pragma warning(disable:4267) // 'argument' : conversion from 'size_t' to
305 // 'unsigned int', possible loss of data
306 // A misguided attempt to detect 64-bit
307 // incompatability.
308#endif
309#endif
310
311 template <class T>
312 inline void hash_combine(std::size_t& seed, T const& v)
313 {
314 boost::hash<T> hasher;
315 return boost::hash_detail::hash_combine_impl(seed, hasher(v));
316 }
317
318#if defined(BOOST_MSVC)
319#pragma warning(pop)
320#endif
321
322 template <class It>
323 inline std::size_t hash_range(It first, It last)
324 {
325 std::size_t seed = 0;
326
327 for(; first != last; ++first)
328 {
329 hash_combine(seed, *first);
330 }
331
332 return seed;
333 }
334
335 template <class It>
336 inline void hash_range(std::size_t& seed, It first, It last)
337 {
338 for(; first != last; ++first)
339 {
340 hash_combine(seed, *first);
341 }
342 }
343
344#if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x551))
345 template <class T>
346 inline std::size_t hash_range(T* first, T* last)
347 {
348 std::size_t seed = 0;
349
350 for(; first != last; ++first)
351 {
352 boost::hash<T> hasher;
353 seed ^= hasher(*first) + 0x9e3779b9 + (seed<<6) + (seed>>2);
354 }
355
356 return seed;
357 }
358
359 template <class T>
360 inline void hash_range(std::size_t& seed, T* first, T* last)
361 {
362 for(; first != last; ++first)
363 {
364 boost::hash<T> hasher;
365 seed ^= hasher(*first) + 0x9e3779b9 + (seed<<6) + (seed>>2);
366 }
367 }
368#endif
369
370#if !defined(BOOST_NO_FUNCTION_TEMPLATE_ORDERING)
371 template< class T, unsigned N >
372 inline std::size_t hash_value(const T (&x)[N])
373 {
374 return hash_range(x, x + N);
375 }
376
377 template< class T, unsigned N >
378 inline std::size_t hash_value(T (&x)[N])
379 {
380 return hash_range(x, x + N);
381 }
382#endif
383
384 template <class Ch, class A>
385 inline std::size_t hash_value(
386 std::basic_string<Ch, std::BOOST_HASH_CHAR_TRAITS<Ch>, A> const& v)
387 {
388 return hash_range(v.begin(), v.end());
389 }
390
391 template <typename T>
392 typename boost::hash_detail::float_numbers<T>::type hash_value(T v)
393 {
394 return boost::hash_detail::float_hash_value(v);
395 }
396
397#if !defined(BOOST_NO_CXX11_HDR_TYPEINDEX)
398 inline std::size_t hash_value(std::type_index v)
399 {
400 return v.hash_code();
401 }
402#endif
403
404 //
405 // boost::hash
406 //
407
408 // Define the specializations required by the standard. The general purpose
409 // boost::hash is defined later in extensions.hpp if
410 // BOOST_HASH_NO_EXTENSIONS is not defined.
411
412 // BOOST_HASH_SPECIALIZE - define a specialization for a type which is
413 // passed by copy.
414 //
415 // BOOST_HASH_SPECIALIZE_REF - define a specialization for a type which is
416 // passed by const reference.
417 //
418 // These are undefined later.
419
420#define BOOST_HASH_SPECIALIZE(type) \
421 template <> struct hash<type> \
422 : public std::unary_function<type, std::size_t> \
423 { \
424 std::size_t operator()(type v) const \
425 { \
426 return boost::hash_value(v); \
427 } \
428 };
429
430#define BOOST_HASH_SPECIALIZE_REF(type) \
431 template <> struct hash<type> \
432 : public std::unary_function<type, std::size_t> \
433 { \
434 std::size_t operator()(type const& v) const \
435 { \
436 return boost::hash_value(v); \
437 } \
438 };
439
440 BOOST_HASH_SPECIALIZE(bool)
441 BOOST_HASH_SPECIALIZE(char)
442 BOOST_HASH_SPECIALIZE(signed char)
443 BOOST_HASH_SPECIALIZE(unsigned char)
444#if !defined(BOOST_NO_INTRINSIC_WCHAR_T)
445 BOOST_HASH_SPECIALIZE(wchar_t)
446#endif
447 BOOST_HASH_SPECIALIZE(short)
448 BOOST_HASH_SPECIALIZE(unsigned short)
449 BOOST_HASH_SPECIALIZE(int)
450 BOOST_HASH_SPECIALIZE(unsigned int)
451 BOOST_HASH_SPECIALIZE(long)
452 BOOST_HASH_SPECIALIZE(unsigned long)
453
454 BOOST_HASH_SPECIALIZE(float)
455 BOOST_HASH_SPECIALIZE(double)
456 BOOST_HASH_SPECIALIZE(long double)
457
458 BOOST_HASH_SPECIALIZE_REF(std::string)
459#if !defined(BOOST_NO_STD_WSTRING)
460 BOOST_HASH_SPECIALIZE_REF(std::wstring)
461#endif
462
463#if !defined(BOOST_NO_LONG_LONG)
464 BOOST_HASH_SPECIALIZE(boost::long_long_type)
465 BOOST_HASH_SPECIALIZE(boost::ulong_long_type)
466#endif
467
468#if defined(BOOST_HAS_INT128)
469 BOOST_HASH_SPECIALIZE(boost::int128_type)
470 BOOST_HASH_SPECIALIZE(boost::uint128_type)
471#endif
472
473#if !defined(BOOST_NO_CXX11_HDR_TYPEINDEX)
474 BOOST_HASH_SPECIALIZE(std::type_index)
475#endif
476
477#undef BOOST_HASH_SPECIALIZE
478#undef BOOST_HASH_SPECIALIZE_REF
479
480// Specializing boost::hash for pointers.
481
482#if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
483
484 template <class T>
485 struct hash<T*>
486 : public std::unary_function<T*, std::size_t>
487 {
488 std::size_t operator()(T* v) const
489 {
490#if !BOOST_WORKAROUND(__SUNPRO_CC, <= 0x590)
491 return boost::hash_value(v);
492#else
493 std::size_t x = static_cast<std::size_t>(
494 reinterpret_cast<std::ptrdiff_t>(v));
495
496 return x + (x >> 3);
497#endif
498 }
499 };
500
501#else
502
503 // For compilers without partial specialization, we define a
504 // boost::hash for all remaining types. But hash_impl is only defined
505 // for pointers in 'extensions.hpp' - so when BOOST_HASH_NO_EXTENSIONS
506 // is defined there will still be a compile error for types not supported
507 // in the standard.
508
509 namespace hash_detail
510 {
511 template <bool IsPointer>
512 struct hash_impl;
513
514 template <>
515 struct hash_impl<true>
516 {
517 template <class T>
518 struct inner
519 : public std::unary_function<T, std::size_t>
520 {
521 std::size_t operator()(T val) const
522 {
523#if !BOOST_WORKAROUND(__SUNPRO_CC, <= 590)
524 return boost::hash_value(val);
525#else
526 std::size_t x = static_cast<std::size_t>(
527 reinterpret_cast<std::ptrdiff_t>(val));
528
529 return x + (x >> 3);
530#endif
531 }
532 };
533 };
534 }
535
536 template <class T> struct hash
537 : public boost::hash_detail::hash_impl<boost::is_pointer<T>::value>
538 ::BOOST_NESTED_TEMPLATE inner<T>
539 {
540 };
541
542#endif
543}
544
545#undef BOOST_HASH_CHAR_TRAITS
546#undef BOOST_FUNCTIONAL_HASH_ROTL32
547
548#if defined(BOOST_MSVC)
549#pragma warning(pop)
550#endif
551
552#endif // BOOST_FUNCTIONAL_HASH_HASH_HPP
553
554// Include this outside of the include guards in case the file is included
555// twice - once with BOOST_HASH_NO_EXTENSIONS defined, and then with it
556// undefined.
557
558#if !defined(BOOST_HASH_NO_EXTENSIONS) \
559 && !defined(BOOST_FUNCTIONAL_HASH_EXTENSIONS_HPP)
560#include <boost/functional/hash/extensions.hpp>
561#endif
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