author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Fri, 11 Jun 2010 15:26:22 +0300 | |
changeset 34 | 5fae379060a7 |
parent 0 | e4d67989cc36 |
permissions | -rw-r--r-- |
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/* |
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* Portions Copyright (c) 2008 Nokia Corporation and/or its subsidiary(-ies). All rights reserved. |
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* |
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* Copyright (c) 1994 |
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* Hewlett-Packard Company |
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* |
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* Copyright (c) 1996,1997 |
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* Silicon Graphics Computer Systems, Inc. |
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* |
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* Copyright (c) 1997 |
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* Moscow Center for SPARC Technology |
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* |
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* Copyright (c) 1999 |
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* Boris Fomitchev |
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* |
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* This material is provided "as is", with absolutely no warranty expressed |
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* or implied. Any use is at your own risk. |
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* |
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* Permission to use or copy this software for any purpose is hereby granted |
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* without fee, provided the above notices are retained on all copies. |
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* Permission to modify the code and to distribute modified code is granted, |
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* provided the above notices are retained, and a notice that the code was |
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* modified is included with the above copyright notice. |
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* |
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*/ |
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#ifndef _STLP_HASHTABLE_C |
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#define _STLP_HASHTABLE_C |
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#ifndef _STLP_INTERNAL_HASHTABLE_H |
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# include <stl/_hashtable.h> |
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#endif |
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_STLP_BEGIN_NAMESPACE |
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#if defined (_STLP_EXPOSE_GLOBALS_IMPLEMENTATION) |
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_STLP_MOVE_TO_PRIV_NAMESPACE |
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# define __PRIME_LIST_BODY { \ |
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7ul, 23ul, \ |
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53ul, 97ul, 193ul, 389ul, 769ul, \ |
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1543ul, 3079ul, 6151ul, 12289ul, 24593ul, \ |
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49157ul, 98317ul, 196613ul, 393241ul, 786433ul, \ |
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1572869ul, 3145739ul, 6291469ul, 12582917ul, 25165843ul, \ |
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50331653ul, 100663319ul, 201326611ul, 402653189ul, 805306457ul,\ |
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1610612741ul, 3221225473ul, 4294967291ul \ |
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} |
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template <class _Dummy> |
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size_t _STLP_CALL |
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_Stl_prime<_Dummy>::_S_max_nb_buckets() { |
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const size_t _list[] = __PRIME_LIST_BODY; |
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# ifndef __MWERKS__ |
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return _list[(sizeof(_list)/sizeof(_list[0])) - 1]; |
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# else |
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// it has to be 30 * (sizeof(_list[0]) to get the last element of the array |
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return _list[30 * (sizeof(_list[0])/sizeof(size_t)) - 1]; // stupid MWERKS! |
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# endif |
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} |
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template <class _Dummy> |
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size_t _STLP_CALL |
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_Stl_prime<_Dummy>::_S_next_size(size_t __n) { |
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static const size_t _list[] = __PRIME_LIST_BODY; |
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const size_t* __first = _list; |
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# ifndef __MWERKS__ |
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const size_t* __last = _list + (sizeof(_list)/sizeof(_list[0])); |
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# else |
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// it has to be 30 * (sizeof(_list[0]) to get the last element of the array |
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const size_t* __last = _list + ((30*sizeof(_list[0]))/sizeof(size_t)); // stupid MWERKS |
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# endif |
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const size_t* pos = __lower_bound(__first, __last, __n, |
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__less((size_t*)0), __less((size_t*)0), (ptrdiff_t*)0); |
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return (pos == __last ? *(__last - 1) : *pos); |
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} |
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# undef __PRIME_LIST_BODY |
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_STLP_MOVE_TO_STD_NAMESPACE |
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#endif |
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#if defined (_STLP_DEBUG) |
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# define hashtable _STLP_NON_DBG_NAME(hashtable) |
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_STLP_MOVE_TO_PRIV_NAMESPACE |
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#endif |
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// fbp: these defines are for outline methods definitions. |
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// needed to definitions to be portable. Should not be used in method bodies. |
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|
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#if defined ( _STLP_NESTED_TYPE_PARAM_BUG ) |
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# define __size_type__ size_t |
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# define size_type size_t |
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# define value_type _Val |
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# define key_type _Key |
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# define __reference__ _Val& |
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# define __iterator__ _Ht_iterator<_Val, _STLP_HEADER_TYPENAME _Traits::_NonConstTraits, \ |
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_Key, _HF, _ExK, _EqK, _All> |
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# define __const_iterator__ _Ht_iterator<_Val, _STLP_HEADER_TYPENAME _Traits::_ConstTraits, \ |
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_Key, _HF, _ExK, _EqK, _All> |
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#else |
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# define __size_type__ _STLP_TYPENAME_ON_RETURN_TYPE hashtable<_Val, _Key, _HF, _Traits, _ExK, _EqK, _All>::size_type |
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# define __reference__ _STLP_TYPENAME_ON_RETURN_TYPE hashtable<_Val, _Key, _HF, _Traits, _ExK, _EqK, _All>::reference |
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# define __iterator__ _STLP_TYPENAME_ON_RETURN_TYPE hashtable<_Val, _Key, _HF, _Traits, _ExK, _EqK, _All>::iterator |
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# define __const_iterator__ _STLP_TYPENAME_ON_RETURN_TYPE hashtable<_Val, _Key, _HF, _Traits, _ExK, _EqK, _All>::const_iterator |
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#endif |
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108 |
|
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/* |
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* This method is too difficult to implement for hashtable that do not |
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* require a sorted operation on the stored type. |
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template <class _Val, class _Key, class _HF, |
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class _Traits, class _ExK, class _EqK, class _All> |
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bool hashtable<_Val,_Key,_HF,_Traits,_ExK,_EqK,_All>::_M_equal( |
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const hashtable<_Val,_Key,_HF,_Traits,_ExK,_EqK,_All>& __ht1, |
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const hashtable<_Val,_Key,_HF,_Traits,_ExK,_EqK,_All>& __ht2) { |
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return __ht1._M_buckets == __ht2._M_buckets && |
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__ht1._M_elems == __ht2._M_elems; |
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} |
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*/ |
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121 |
|
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/* Returns the iterator before the first iterator of the bucket __n and set |
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* __n to the first previous bucket having the same first iterator as bucket |
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* __n. |
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*/ |
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template <class _Val, class _Key, class _HF, |
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class _Traits, class _ExK, class _EqK, class _All> |
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__iterator__ |
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hashtable<_Val,_Key,_HF,_Traits,_ExK,_EqK,_All> |
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::_M_before_begin(size_type &__n) const { |
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return _S_before_begin(_M_elems, _M_buckets, __n); |
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} |
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133 |
|
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template <class _Val, class _Key, class _HF, |
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class _Traits, class _ExK, class _EqK, class _All> |
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__iterator__ |
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hashtable<_Val,_Key,_HF,_Traits,_ExK,_EqK,_All> |
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::_S_before_begin(const _ElemsCont& __elems, const _BucketVector& __buckets, |
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size_type &__n) { |
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_ElemsCont &__mutable_elems = __CONST_CAST(_ElemsCont&, __elems); |
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typename _BucketVector::const_iterator __bpos(__buckets.begin() + __n); |
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142 |
|
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_ElemsIte __pos(*__bpos); |
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if (__pos == __mutable_elems.begin()) { |
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__n = 0; |
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return __mutable_elems.before_begin(); |
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} |
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148 |
|
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typename _BucketVector::const_iterator __bcur(__bpos); |
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_BucketType *__pos_node = __pos._M_node; |
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for (--__bcur; __pos_node == *__bcur; --__bcur) {} |
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|
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__n = __bcur - __buckets.begin() + 1; |
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_ElemsIte __cur(*__bcur); |
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_ElemsIte __prev = __cur++; |
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for (; __cur != __pos; ++__prev, ++__cur) {} |
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return __prev; |
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} |
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159 |
|
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160 |
|
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template <class _Val, class _Key, class _HF, |
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class _Traits, class _ExK, class _EqK, class _All> |
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__iterator__ |
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hashtable<_Val,_Key,_HF,_Traits,_ExK,_EqK,_All> |
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::_M_insert_noresize(size_type __n, const value_type& __obj) { |
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//We always insert this element as 1st in the bucket to not break |
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//the elements order as equal elements must be kept next to each other. |
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size_type __prev = __n; |
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_ElemsIte __pos = _M_before_begin(__prev)._M_ite; |
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170 |
|
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fill(_M_buckets.begin() + __prev, _M_buckets.begin() + __n + 1, |
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_M_elems.insert_after(__pos, __obj)._M_node); |
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++_M_num_elements; |
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return iterator(_ElemsIte(_M_buckets[__n])); |
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} |
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176 |
|
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template <class _Val, class _Key, class _HF, |
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class _Traits, class _ExK, class _EqK, class _All> |
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pair<__iterator__, bool> |
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hashtable<_Val,_Key,_HF,_Traits,_ExK,_EqK,_All> |
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::insert_unique_noresize(const value_type& __obj) { |
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const size_type __n = _M_bkt_num(__obj); |
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_ElemsIte __cur(_M_buckets[__n]); |
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_ElemsIte __last(_M_buckets[__n + 1]); |
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|
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if (__cur != __last) { |
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for (; __cur != __last; ++__cur) { |
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if (_M_equals(_M_get_key(*__cur), _M_get_key(__obj))) { |
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//We check that equivalent keys have equals hash code as otherwise, on resize, |
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//equivalent value might not be in the same bucket |
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_STLP_ASSERT(_M_hash(_M_get_key(*__cur)) == _M_hash(_M_get_key(__obj))) |
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return pair<iterator, bool>(iterator(__cur), false); |
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} |
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} |
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/* Here we do not rely on the _M_insert_noresize method as we know |
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* that we cannot break element orders, elements are unique, and |
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* insertion after the first bucket element is faster than what is |
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* done in _M_insert_noresize. |
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*/ |
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__cur = _M_elems.insert_after(_ElemsIte(_M_buckets[__n]), __obj); |
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++_M_num_elements; |
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return pair<iterator, bool>(iterator(__cur), true); |
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} |
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204 |
|
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return pair<iterator, bool>(_M_insert_noresize(__n, __obj), true); |
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} |
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207 |
|
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template <class _Val, class _Key, class _HF, |
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class _Traits, class _ExK, class _EqK, class _All> |
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__iterator__ |
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hashtable<_Val,_Key,_HF,_Traits,_ExK,_EqK,_All> |
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::insert_equal_noresize(const value_type& __obj) { |
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const size_type __n = _M_bkt_num(__obj); |
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{ |
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_ElemsIte __cur(_M_buckets[__n]); |
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_ElemsIte __last(_M_buckets[__n + 1]); |
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217 |
|
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for (; __cur != __last; ++__cur) { |
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if (_M_equals(_M_get_key(*__cur), _M_get_key(__obj))) { |
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//We check that equivalent keys have equals hash code as otherwise, on resize, |
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//equivalent value might not be in the same bucket |
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_STLP_ASSERT(_M_hash(_M_get_key(*__cur)) == _M_hash(_M_get_key(__obj))) |
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++_M_num_elements; |
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return _M_elems.insert_after(__cur, __obj); |
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} |
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} |
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} |
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228 |
|
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return _M_insert_noresize(__n, __obj); |
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} |
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231 |
|
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template <class _Val, class _Key, class _HF, |
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class _Traits, class _ExK, class _EqK, class _All> |
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__reference__ |
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hashtable<_Val,_Key,_HF,_Traits,_ExK,_EqK,_All> |
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::_M_insert(const value_type& __obj) { |
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resize(_M_num_elements + 1); |
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return *insert_unique_noresize(__obj).first; |
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} |
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240 |
|
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/* |
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template <class _Val, class _Key, class _HF, |
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class _Traits, class _ExK, class _EqK, class _All> |
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__reference__ |
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hashtable<_Val,_Key,_HF,_Traits,_ExK,_EqK,_All> |
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::find_or_insert(const value_type& __obj) { |
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_Node* __first = _M_find(_M_get_key(__obj)); |
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if (__first) |
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return __first->_M_val; |
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else |
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return _M_insert(__obj); |
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} |
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*/ |
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254 |
|
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template <class _Val, class _Key, class _HF, |
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class _Traits, class _ExK, class _EqK, class _All> |
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__size_type__ |
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hashtable<_Val,_Key,_HF,_Traits,_ExK,_EqK,_All> |
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::erase(const key_type& __key) { |
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const size_type __n = _M_bkt_num_key(__key); |
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261 |
|
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_ElemsIte __cur(_M_buckets[__n]); |
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_ElemsIte __last(_M_buckets[__n + 1]); |
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if (__cur == __last) |
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return 0; |
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|
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size_type __erased = 0; |
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if (_M_equals(_M_get_key(*__cur), __key)) { |
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//We look for the pos before __cur: |
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size_type __prev_b = __n; |
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_ElemsIte __prev = _M_before_begin(__prev_b)._M_ite; |
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do { |
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__cur = _M_elems.erase_after(__prev); |
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++__erased; |
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} while ((__cur != __last) && _M_equals(_M_get_key(*__cur), __key)); |
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fill(_M_buckets.begin() + __prev_b, _M_buckets.begin() + __n + 1, __cur._M_node); |
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} |
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else { |
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_ElemsIte __prev = __cur++; |
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for (; __cur != __last; ++__prev, ++__cur) { |
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if (_M_equals(_M_get_key(*__cur), __key)) { |
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do { |
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__cur = _M_elems.erase_after(__prev); |
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++__erased; |
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} while ((__cur != __last) && _M_equals(_M_get_key(*__cur), __key)); |
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break; |
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} |
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} |
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} |
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|
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_M_num_elements -= __erased; |
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return __erased; |
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} |
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|
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template <class _Val, class _Key, class _HF, |
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class _Traits, class _ExK, class _EqK, class _All> |
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void hashtable<_Val,_Key,_HF,_Traits,_ExK,_EqK,_All> |
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::erase(const_iterator __it) { |
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const size_type __n = _M_bkt_num(*__it); |
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_ElemsIte __cur(_M_buckets[__n]); |
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|
301 |
|
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|
302 |
if (__cur == __it._M_ite) { |
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size_type __prev_b = __n; |
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_ElemsIte __prev = _M_before_begin(__prev_b)._M_ite; |
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|
305 |
fill(_M_buckets.begin() + __prev_b, _M_buckets.begin() + __n + 1, |
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_M_elems.erase_after(__prev)._M_node); |
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--_M_num_elements; |
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} |
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309 |
else { |
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_ElemsIte __prev = __cur++; |
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_ElemsIte __last(_M_buckets[__n + 1]); |
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for (; __cur != __last; ++__prev, ++__cur) { |
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if (__cur == __it._M_ite) { |
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_M_elems.erase_after(__prev); |
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--_M_num_elements; |
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break; |
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} |
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} |
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} |
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} |
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|
321 |
|
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template <class _Val, class _Key, class _HF, |
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class _Traits, class _ExK, class _EqK, class _All> |
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void hashtable<_Val,_Key,_HF,_Traits,_ExK,_EqK,_All> |
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::erase(const_iterator __first, const_iterator __last) { |
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if (__first == __last) |
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return; |
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size_type __f_bucket = _M_bkt_num(*__first); |
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size_type __l_bucket = __last != end() ? _M_bkt_num(*__last) : (_M_buckets.size() - 1); |
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|
330 |
|
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_ElemsIte __cur(_M_buckets[__f_bucket]); |
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_ElemsIte __prev; |
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if (__cur == __first._M_ite) { |
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__prev = _M_before_begin(__f_bucket)._M_ite; |
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} |
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336 |
else { |
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_ElemsIte __last(_M_buckets[++__f_bucket]); |
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__prev = __cur++; |
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for (; (__cur != __last) && (__cur != __first._M_ite); ++__prev, ++__cur); |
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340 |
} |
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341 |
//We do not use the slist::erase_after method taking a range to count the |
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342 |
//number of erased elements: |
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while (__cur != __last._M_ite) { |
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__cur = _M_elems.erase_after(__prev); |
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--_M_num_elements; |
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346 |
} |
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fill(_M_buckets.begin() + __f_bucket, _M_buckets.begin() + __l_bucket + 1, __cur._M_node); |
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348 |
} |
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|
349 |
|
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350 |
template <class _Val, class _Key, class _HF, |
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351 |
class _Traits, class _ExK, class _EqK, class _All> |
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352 |
void hashtable<_Val,_Key,_HF,_Traits,_ExK,_EqK,_All> |
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::rehash(size_type __num_buckets_hint) { |
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if ((bucket_count() >= __num_buckets_hint) && |
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(max_load_factor() > load_factor())) |
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356 |
return; |
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|
357 |
|
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|
358 |
//Here if max_load_factor is lower than 1.0 the resulting value might not be representable |
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359 |
//as a size_type. The result concerning the respect of the max_load_factor will then be |
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360 |
//undefined. |
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|
361 |
__num_buckets_hint = (max) (__num_buckets_hint, (size_type)((float)size() / max_load_factor())); |
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|
362 |
size_type __num_buckets = _STLP_PRIV _Stl_prime_type::_S_next_size(__num_buckets_hint); |
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|
363 |
_M_rehash(__num_buckets); |
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|
364 |
} |
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|
365 |
|
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|
366 |
template <class _Val, class _Key, class _HF, |
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|
367 |
class _Traits, class _ExK, class _EqK, class _All> |
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|
368 |
void hashtable<_Val,_Key,_HF,_Traits,_ExK,_EqK,_All> |
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|
369 |
::resize(size_type __num_elements_hint) { |
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|
370 |
if (((float)__num_elements_hint / (float)bucket_count() <= max_load_factor()) && |
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|
371 |
(max_load_factor() >= load_factor())) { |
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|
372 |
return; |
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|
373 |
} |
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|
374 |
|
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|
375 |
size_type __num_buckets_hint = (size_type)((float)(max) (__num_elements_hint, size()) / max_load_factor()); |
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|
376 |
size_type __num_buckets = _STLP_PRIV _Stl_prime_type::_S_next_size(__num_buckets_hint); |
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|
377 |
#if defined (_STLP_DEBUG) |
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|
378 |
_M_check(); |
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|
379 |
#endif |
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|
380 |
_M_rehash(__num_buckets); |
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|
381 |
} |
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|
382 |
|
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|
383 |
template <class _Val, class _Key, class _HF, |
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|
384 |
class _Traits, class _ExK, class _EqK, class _All> |
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|
385 |
void hashtable<_Val,_Key,_HF,_Traits,_ExK,_EqK,_All> |
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|
386 |
::_M_rehash(size_type __num_buckets) { |
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|
387 |
_ElemsCont __tmp_elems(_M_elems.get_allocator()); |
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|
388 |
_BucketVector __tmp(__num_buckets + 1, __STATIC_CAST(_BucketType*, 0), _M_buckets.get_allocator()); |
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|
389 |
_ElemsIte __cur, __last(_M_elems.end()); |
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|
390 |
while (!_M_elems.empty()) { |
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|
391 |
__cur = _M_elems.begin(); |
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|
392 |
size_type __new_bucket = _M_bkt_num(*__cur, __num_buckets); |
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|
393 |
_ElemsIte __ite(__cur), __before_ite(__cur); |
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|
394 |
for (++__ite; |
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|
395 |
__ite != __last && _M_equals(_M_get_key(*__cur), _M_get_key(*__ite)); |
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|
396 |
++__ite, ++__before_ite) {} |
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|
397 |
size_type __prev_bucket = __new_bucket; |
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|
398 |
_ElemsIte __prev = _S_before_begin(__tmp_elems, __tmp, __prev_bucket)._M_ite; |
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399 |
__tmp_elems.splice_after(__prev, _M_elems, _M_elems.before_begin(), __before_ite); |
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fill(__tmp.begin() + __prev_bucket, __tmp.begin() + __new_bucket + 1, __cur._M_node); |
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401 |
} |
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402 |
_M_elems.swap(__tmp_elems); |
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403 |
_M_buckets.swap(__tmp); |
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404 |
} |
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405 |
|
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406 |
#if defined (_STLP_DEBUG) |
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407 |
template <class _Val, class _Key, class _HF, |
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408 |
class _Traits, class _ExK, class _EqK, class _All> |
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409 |
void hashtable<_Val,_Key,_HF,_Traits,_ExK,_EqK,_All>::_M_check() const { |
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410 |
//We check that hash code of stored keys haven't change and also that equivalent |
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411 |
//relation hasn't been modified |
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412 |
size_t __num_buckets = bucket_count(); |
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for (size_t __b = 0; __b < __num_buckets; ++__b) { |
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414 |
_ElemsIte __cur(_M_buckets[__b]), __last(_M_buckets[__b + 1]); |
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415 |
_ElemsIte __fst(__cur), __snd(__cur); |
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416 |
for (; __cur != __last; ++__cur) { |
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_STLP_ASSERT( _M_bkt_num(*__cur, __num_buckets) == __b ) |
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_STLP_ASSERT( !_M_equals(_M_get_key(*__fst), _M_get_key(*__cur)) || _M_equals(_M_get_key(*__snd), _M_get_key(*__cur)) ) |
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if (__fst != __snd) |
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++__fst; |
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if (__snd != __cur) |
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++__snd; |
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} |
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424 |
} |
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425 |
} |
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426 |
#endif |
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427 |
|
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428 |
template <class _Val, class _Key, class _HF, |
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429 |
class _Traits, class _ExK, class _EqK, class _All> |
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void hashtable<_Val,_Key,_HF,_Traits,_ExK,_EqK,_All>::clear() { |
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431 |
_M_elems.clear(); |
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_M_buckets.assign(_M_buckets.size(), __STATIC_CAST(_BucketType*, 0)); |
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_M_num_elements = 0; |
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434 |
} |
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435 |
|
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436 |
template <class _Val, class _Key, class _HF, |
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437 |
class _Traits, class _ExK, class _EqK, class _All> |
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438 |
void hashtable<_Val,_Key,_HF,_Traits,_ExK,_EqK,_All> |
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::_M_copy_from(const hashtable<_Val,_Key,_HF,_Traits,_ExK,_EqK,_All>& __ht) { |
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_M_elems.clear(); |
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441 |
_M_elems.insert(_M_elems.end(), __ht._M_elems.begin(), __ht._M_elems.end()); |
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442 |
_M_buckets.resize(__ht._M_buckets.size()); |
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_ElemsConstIte __src(__ht._M_elems.begin()), __src_end(__ht._M_elems.end()); |
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_ElemsIte __dst(_M_elems.begin()); |
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typename _BucketVector::const_iterator __src_b(__ht._M_buckets.begin()), |
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__src_end_b(__ht._M_buckets.end()); |
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typename _BucketVector::iterator __dst_b(_M_buckets.begin()), __dst_end_b(_M_buckets.end()); |
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for (; __src != __src_end; ++__src, ++__dst) { |
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for (; __src_b != __src_end_b; ++__src_b, ++__dst_b) { |
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if (*__src_b == __src._M_node) { |
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*__dst_b = __dst._M_node; |
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452 |
} |
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453 |
else |
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454 |
break; |
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455 |
} |
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456 |
} |
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457 |
fill(__dst_b, __dst_end_b, __STATIC_CAST(_BucketType*, 0)); |
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458 |
_M_num_elements = __ht._M_num_elements; |
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459 |
_M_max_load_factor = __ht._M_max_load_factor; |
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460 |
} |
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461 |
|
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462 |
#undef __iterator__ |
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463 |
#undef const_iterator |
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464 |
#undef __size_type__ |
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465 |
#undef __reference__ |
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#undef size_type |
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467 |
#undef value_type |
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468 |
#undef key_type |
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469 |
#undef __stl_num_primes |
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470 |
|
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471 |
#if defined (_STLP_DEBUG) |
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472 |
# undef hashtable |
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473 |
_STLP_MOVE_TO_STD_NAMESPACE |
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474 |
#endif |
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475 |
|
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476 |
_STLP_END_NAMESPACE |
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|
477 |
|
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478 |
#endif /* _STLP_HASHTABLE_C */ |
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479 |
|
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Revision: 201002
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480 |
// Local Variables: |
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481 |
// mode:C++ |
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482 |
// End: |