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Retro68/gcc/libstdc++-v3/include/bits/hashtable.h
Wolfgang Thaller aaf905ce07 add gcc 4.70
2012-03-28 01:13:14 +02:00

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// hashtable.h header -*- C++ -*-
// Copyright (C) 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.
// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
// <http://www.gnu.org/licenses/>.
/** @file bits/hashtable.h
* This is an internal header file, included by other library headers.
* Do not attempt to use it directly. @headername{unordered_map, unordered_set}
*/
#ifndef _HASHTABLE_H
#define _HASHTABLE_H 1
#pragma GCC system_header
#include <bits/hashtable_policy.h>
namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
// Class template _Hashtable, class definition.
// Meaning of class template _Hashtable's template parameters
// _Key and _Value: arbitrary CopyConstructible types.
// _Allocator: an allocator type ([lib.allocator.requirements]) whose
// value type is Value. As a conforming extension, we allow for
// value type != Value.
// _ExtractKey: function object that takes an object of type Value
// and returns a value of type _Key.
// _Equal: function object that takes two objects of type k and returns
// a bool-like value that is true if the two objects are considered equal.
// _H1: the hash function. A unary function object with argument type
// Key and result type size_t. Return values should be distributed
// over the entire range [0, numeric_limits<size_t>:::max()].
// _H2: the range-hashing function (in the terminology of Tavori and
// Dreizin). A binary function object whose argument types and result
// type are all size_t. Given arguments r and N, the return value is
// in the range [0, N).
// _Hash: the ranged hash function (Tavori and Dreizin). A binary function
// whose argument types are _Key and size_t and whose result type is
// size_t. Given arguments k and N, the return value is in the range
// [0, N). Default: hash(k, N) = h2(h1(k), N). If _Hash is anything other
// than the default, _H1 and _H2 are ignored.
// _RehashPolicy: Policy class with three members, all of which govern
// the bucket count. _M_next_bkt(n) returns a bucket count no smaller
// than n. _M_bkt_for_elements(n) returns a bucket count appropriate
// for an element count of n. _M_need_rehash(n_bkt, n_elt, n_ins)
// determines whether, if the current bucket count is n_bkt and the
// current element count is n_elt, we need to increase the bucket
// count. If so, returns make_pair(true, n), where n is the new
// bucket count. If not, returns make_pair(false, <anything>).
// __cache_hash_code: bool. true if we store the value of the hash
// function along with the value. This is a time-space tradeoff.
// Storing it may improve lookup speed by reducing the number of times
// we need to call the Equal function.
// __constant_iterators: bool. true if iterator and const_iterator are
// both constant iterator types. This is true for unordered_set and
// unordered_multiset, false for unordered_map and unordered_multimap.
// __unique_keys: bool. true if the return value of _Hashtable::count(k)
// is always at most one, false if it may be an arbitrary number. This
// true for unordered_set and unordered_map, false for unordered_multiset
// and unordered_multimap.
/**
* Here's _Hashtable data structure, each _Hashtable has:
* - _Bucket[] _M_buckets
* - _Hash_node_base _M_before_begin
* - size_type _M_bucket_count
* - size_type _M_element_count
*
* with _Bucket being _Hash_node* and _Hash_node constaining:
* - _Hash_node* _M_next
* - Tp _M_value
* - size_t _M_code if cache_hash_code is true
*
* In terms of Standard containers the hastable is like the aggregation of:
* - std::forward_list<_Node> containing the elements
* - std::vector<std::forward_list<_Node>::iterator> representing the buckets
*
* The non-empty buckets contain the node before the first bucket node. This
* design allow to implement something like a std::forward_list::insert_after
* on container insertion and std::forward_list::erase_after on container
* erase calls. _M_before_begin is equivalent to
* std::foward_list::before_begin. Empty buckets are containing nullptr.
* Note that one of the non-empty bucket contains &_M_before_begin which is
* not a derefenrenceable node so the node pointers in buckets shall never be
* derefenrenced, only its next node can be.
*
* Walk through a bucket nodes require a check on the hash code to see if the
* node is still in the bucket. Such a design impose a quite efficient hash
* functor and is one of the reasons it is highly advise to set
* __cache_hash_code to true.
*
* The container iterators are simply built from nodes. This way incrementing
* the iterator is perfectly efficient independent of how many empty buckets
* there are in the container.
*
* On insert we compute element hash code and thanks to it find the bucket
* index. If the element must be inserted on an empty bucket we add it at the
* beginning of the singly linked list and make the bucket point to
* _M_before_begin. The bucket that used to point to _M_before_begin, if any,
* is updated to point to its new before begin node.
*
* On erase, the simple iterator design impose to use the hash functor to get
* the index of the bucket to update. For this reason, when __cache_hash_code
* is set to false, there is a static assertion that the hash functor cannot
* throw.
*/
template<typename _Key, typename _Value, typename _Allocator,
typename _ExtractKey, typename _Equal,
typename _H1, typename _H2, typename _Hash,
typename _RehashPolicy,
bool __cache_hash_code,
bool __constant_iterators,
bool __unique_keys>
class _Hashtable
: public __detail::_Rehash_base<_RehashPolicy,
_Hashtable<_Key, _Value, _Allocator,
_ExtractKey,
_Equal, _H1, _H2, _Hash,
_RehashPolicy,
__cache_hash_code,
__constant_iterators,
__unique_keys> >,
public __detail::_Hashtable_base<_Key, _Value, _ExtractKey, _Equal,
_H1, _H2, _Hash, __cache_hash_code>,
public __detail::_Map_base<_Key, _Value, _ExtractKey, __unique_keys,
_Hashtable<_Key, _Value, _Allocator,
_ExtractKey,
_Equal, _H1, _H2, _Hash,
_RehashPolicy,
__cache_hash_code,
__constant_iterators,
__unique_keys> >,
public __detail::_Equality_base<_ExtractKey, __unique_keys,
_Hashtable<_Key, _Value, _Allocator,
_ExtractKey,
_Equal, _H1, _H2, _Hash,
_RehashPolicy,
__cache_hash_code,
__constant_iterators,
__unique_keys> >
{
template<typename _Cond>
using __if_hash_code_cached
= __or_<__not_<integral_constant<bool, __cache_hash_code>>, _Cond>;
template<typename _Cond>
using __if_hash_code_not_cached
= __or_<integral_constant<bool, __cache_hash_code>, _Cond>;
// When hash codes are not cached the hash functor shall not throw
// because it is used in methods (erase, swap...) that shall not throw.
static_assert(__if_hash_code_not_cached<__detail::__is_noexcept_hash<_Key,
_H1>>::value,
"Cache the hash code or qualify your hash functor with noexcept");
// Following two static assertions are necessary to guarantee that
// swapping two hashtable instances won't invalidate associated local
// iterators.
// When hash codes are cached local iterator only uses H2 which must then
// be empty.
static_assert(__if_hash_code_cached<is_empty<_H2>>::value,
"Functor used to map hash code to bucket index must be empty");
typedef __detail::_Hash_code_base<_Key, _Value, _ExtractKey,
_H1, _H2, _Hash,
__cache_hash_code> _HCBase;
// When hash codes are not cached local iterator is going to use _HCBase
// above to compute node bucket index so it has to be empty.
static_assert(__if_hash_code_not_cached<is_empty<_HCBase>>::value,
"Cache the hash code or make functors involved in hash code"
" and bucket index computation empty");
public:
typedef _Allocator allocator_type;
typedef _Value value_type;
typedef _Key key_type;
typedef _Equal key_equal;
// mapped_type, if present, comes from _Map_base.
// hasher, if present, comes from _Hash_code_base.
typedef typename _Allocator::pointer pointer;
typedef typename _Allocator::const_pointer const_pointer;
typedef typename _Allocator::reference reference;
typedef typename _Allocator::const_reference const_reference;
typedef std::size_t size_type;
typedef std::ptrdiff_t difference_type;
typedef __detail::_Local_iterator<key_type, value_type, _ExtractKey,
_H1, _H2, _Hash,
__constant_iterators,
__cache_hash_code>
local_iterator;
typedef __detail::_Local_const_iterator<key_type, value_type, _ExtractKey,
_H1, _H2, _Hash,
__constant_iterators,
__cache_hash_code>
const_local_iterator;
typedef __detail::_Node_iterator<value_type, __constant_iterators,
__cache_hash_code>
iterator;
typedef __detail::_Node_const_iterator<value_type,
__constant_iterators,
__cache_hash_code>
const_iterator;
template<typename _Key2, typename _Value2, typename _Ex2, bool __unique2,
typename _Hashtable2>
friend struct __detail::_Map_base;
private:
typedef typename _RehashPolicy::_State _RehashPolicyState;
typedef __detail::_Hash_node<_Value, __cache_hash_code> _Node;
typedef typename _Allocator::template rebind<_Node>::other
_Node_allocator_type;
typedef __detail::_Hash_node_base _BaseNode;
typedef _BaseNode* _Bucket;
typedef typename _Allocator::template rebind<_Bucket>::other
_Bucket_allocator_type;
typedef typename _Allocator::template rebind<_Value>::other
_Value_allocator_type;
_Node_allocator_type _M_node_allocator;
_Bucket* _M_buckets;
size_type _M_bucket_count;
_BaseNode _M_before_begin;
size_type _M_element_count;
_RehashPolicy _M_rehash_policy;
template<typename... _Args>
_Node*
_M_allocate_node(_Args&&... __args);
void
_M_deallocate_node(_Node* __n);
// Deallocate the linked list of nodes pointed to by __n
void
_M_deallocate_nodes(_Node* __n);
_Bucket*
_M_allocate_buckets(size_type __n);
void
_M_deallocate_buckets(_Bucket*, size_type __n);
// Gets bucket begin, deals with the fact that non-empty buckets contain
// their before begin node.
_Node*
_M_bucket_begin(size_type __bkt) const;
_Node*
_M_begin() const
{ return static_cast<_Node*>(_M_before_begin._M_nxt); }
public:
// Constructor, destructor, assignment, swap
_Hashtable(size_type __bucket_hint,
const _H1&, const _H2&, const _Hash&,
const _Equal&, const _ExtractKey&,
const allocator_type&);
template<typename _InputIterator>
_Hashtable(_InputIterator __first, _InputIterator __last,
size_type __bucket_hint,
const _H1&, const _H2&, const _Hash&,
const _Equal&, const _ExtractKey&,
const allocator_type&);
_Hashtable(const _Hashtable&);
_Hashtable(_Hashtable&&);
_Hashtable&
operator=(const _Hashtable& __ht)
{
_Hashtable __tmp(__ht);
this->swap(__tmp);
return *this;
}
_Hashtable&
operator=(_Hashtable&& __ht)
{
// NB: DR 1204.
// NB: DR 675.
this->clear();
this->swap(__ht);
return *this;
}
~_Hashtable() noexcept;
void swap(_Hashtable&);
// Basic container operations
iterator
begin() noexcept
{ return iterator(_M_begin()); }
const_iterator
begin() const noexcept
{ return const_iterator(_M_begin()); }
iterator
end() noexcept
{ return iterator(nullptr); }
const_iterator
end() const noexcept
{ return const_iterator(nullptr); }
const_iterator
cbegin() const noexcept
{ return const_iterator(_M_begin()); }
const_iterator
cend() const noexcept
{ return const_iterator(nullptr); }
size_type
size() const noexcept
{ return _M_element_count; }
bool
empty() const noexcept
{ return size() == 0; }
allocator_type
get_allocator() const noexcept
{ return allocator_type(_M_node_allocator); }
size_type
max_size() const noexcept
{ return _M_node_allocator.max_size(); }
// Observers
key_equal
key_eq() const
{ return this->_M_eq(); }
// hash_function, if present, comes from _Hash_code_base.
// Bucket operations
size_type
bucket_count() const noexcept
{ return _M_bucket_count; }
size_type
max_bucket_count() const noexcept
{ return max_size(); }
size_type
bucket_size(size_type __n) const
{ return std::distance(begin(__n), end(__n)); }
size_type
bucket(const key_type& __k) const
{ return _M_bucket_index(__k, this->_M_hash_code(__k)); }
local_iterator
begin(size_type __n)
{ return local_iterator(_M_bucket_begin(__n), __n,
_M_bucket_count); }
local_iterator
end(size_type __n)
{ return local_iterator(nullptr, __n, _M_bucket_count); }
const_local_iterator
begin(size_type __n) const
{ return const_local_iterator(_M_bucket_begin(__n), __n,
_M_bucket_count); }
const_local_iterator
end(size_type __n) const
{ return const_local_iterator(nullptr, __n, _M_bucket_count); }
// DR 691.
const_local_iterator
cbegin(size_type __n) const
{ return const_local_iterator(_M_bucket_begin(__n), __n,
_M_bucket_count); }
const_local_iterator
cend(size_type __n) const
{ return const_local_iterator(nullptr, __n, _M_bucket_count); }
float
load_factor() const noexcept
{
return static_cast<float>(size()) / static_cast<float>(bucket_count());
}
// max_load_factor, if present, comes from _Rehash_base.
// Generalization of max_load_factor. Extension, not found in TR1. Only
// useful if _RehashPolicy is something other than the default.
const _RehashPolicy&
__rehash_policy() const
{ return _M_rehash_policy; }
void
__rehash_policy(const _RehashPolicy&);
// Lookup.
iterator
find(const key_type& __k);
const_iterator
find(const key_type& __k) const;
size_type
count(const key_type& __k) const;
std::pair<iterator, iterator>
equal_range(const key_type& __k);
std::pair<const_iterator, const_iterator>
equal_range(const key_type& __k) const;
private:
// Bucket index computation helpers.
size_type
_M_bucket_index(_Node* __n) const
{ return _HCBase::_M_bucket_index(__n, _M_bucket_count); }
size_type
_M_bucket_index(const key_type& __k,
typename _Hashtable::_Hash_code_type __c) const
{ return _HCBase::_M_bucket_index(__k, __c, _M_bucket_count); }
// Find and insert helper functions and types
// Find the node before the one matching the criteria.
_BaseNode*
_M_find_before_node(size_type, const key_type&,
typename _Hashtable::_Hash_code_type) const;
_Node*
_M_find_node(size_type __bkt, const key_type& __key,
typename _Hashtable::_Hash_code_type __c) const
{
_BaseNode* __before_n = _M_find_before_node(__bkt, __key, __c);
if (__before_n)
return static_cast<_Node*>(__before_n->_M_nxt);
return nullptr;
}
// Insert a node at the beginning of a bucket.
void
_M_insert_bucket_begin(size_type, _Node*);
// Remove the bucket first node
void
_M_remove_bucket_begin(size_type __bkt, _Node* __next_n,
size_type __next_bkt);
// Get the node before __n in the bucket __bkt
_BaseNode*
_M_get_previous_node(size_type __bkt, _BaseNode* __n);
template<typename _Arg>
iterator
_M_insert_bucket(_Arg&&, size_type,
typename _Hashtable::_Hash_code_type);
typedef typename std::conditional<__unique_keys,
std::pair<iterator, bool>,
iterator>::type
_Insert_Return_Type;
typedef typename std::conditional<__unique_keys,
std::_Select1st<_Insert_Return_Type>,
std::_Identity<_Insert_Return_Type>
>::type
_Insert_Conv_Type;
protected:
template<typename... _Args>
std::pair<iterator, bool>
_M_emplace(std::true_type, _Args&&... __args);
template<typename... _Args>
iterator
_M_emplace(std::false_type, _Args&&... __args);
template<typename _Arg>
std::pair<iterator, bool>
_M_insert(_Arg&&, std::true_type);
template<typename _Arg>
iterator
_M_insert(_Arg&&, std::false_type);
public:
// Emplace, insert and erase
template<typename... _Args>
_Insert_Return_Type
emplace(_Args&&... __args)
{ return _M_emplace(integral_constant<bool, __unique_keys>(),
std::forward<_Args>(__args)...); }
template<typename... _Args>
iterator
emplace_hint(const_iterator, _Args&&... __args)
{ return _Insert_Conv_Type()(emplace(std::forward<_Args>(__args)...)); }
_Insert_Return_Type
insert(const value_type& __v)
{ return _M_insert(__v, integral_constant<bool, __unique_keys>()); }
iterator
insert(const_iterator, const value_type& __v)
{ return _Insert_Conv_Type()(insert(__v)); }
template<typename _Pair, typename = typename
std::enable_if<__and_<integral_constant<bool, !__constant_iterators>,
std::is_convertible<_Pair,
value_type>>::value>::type>
_Insert_Return_Type
insert(_Pair&& __v)
{ return _M_insert(std::forward<_Pair>(__v),
integral_constant<bool, __unique_keys>()); }
template<typename _Pair, typename = typename
std::enable_if<__and_<integral_constant<bool, !__constant_iterators>,
std::is_convertible<_Pair,
value_type>>::value>::type>
iterator
insert(const_iterator, _Pair&& __v)
{ return _Insert_Conv_Type()(insert(std::forward<_Pair>(__v))); }
template<typename _InputIterator>
void
insert(_InputIterator __first, _InputIterator __last);
void
insert(initializer_list<value_type> __l)
{ this->insert(__l.begin(), __l.end()); }
iterator
erase(const_iterator);
// LWG 2059.
iterator
erase(iterator __it)
{ return erase(const_iterator(__it)); }
size_type
erase(const key_type&);
iterator
erase(const_iterator, const_iterator);
void
clear() noexcept;
// Set number of buckets to be appropriate for container of n element.
void rehash(size_type __n);
// DR 1189.
// reserve, if present, comes from _Rehash_base.
private:
// Unconditionally change size of bucket array to n, restore hash policy
// state to __state on exception.
void _M_rehash(size_type __n, const _RehashPolicyState& __state);
};
// Definitions of class template _Hashtable's out-of-line member functions.
template<typename _Key, typename _Value,
typename _Allocator, typename _ExtractKey, typename _Equal,
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
bool __chc, bool __cit, bool __uk>
template<typename... _Args>
typename _Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal,
_H1, _H2, _Hash, _RehashPolicy,
__chc, __cit, __uk>::_Node*
_Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal,
_H1, _H2, _Hash, _RehashPolicy, __chc, __cit, __uk>::
_M_allocate_node(_Args&&... __args)
{
_Node* __n = _M_node_allocator.allocate(1);
__try
{
_M_node_allocator.construct(__n, std::forward<_Args>(__args)...);
return __n;
}
__catch(...)
{
_M_node_allocator.deallocate(__n, 1);
__throw_exception_again;
}
}
template<typename _Key, typename _Value,
typename _Allocator, typename _ExtractKey, typename _Equal,
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
bool __chc, bool __cit, bool __uk>
void
_Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal,
_H1, _H2, _Hash, _RehashPolicy, __chc, __cit, __uk>::
_M_deallocate_node(_Node* __n)
{
_M_node_allocator.destroy(__n);
_M_node_allocator.deallocate(__n, 1);
}
template<typename _Key, typename _Value,
typename _Allocator, typename _ExtractKey, typename _Equal,
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
bool __chc, bool __cit, bool __uk>
void
_Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal,
_H1, _H2, _Hash, _RehashPolicy, __chc, __cit, __uk>::
_M_deallocate_nodes(_Node* __n)
{
while (__n)
{
_Node* __tmp = __n;
__n = __n->_M_next();
_M_deallocate_node(__tmp);
}
}
template<typename _Key, typename _Value,
typename _Allocator, typename _ExtractKey, typename _Equal,
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
bool __chc, bool __cit, bool __uk>
typename _Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal,
_H1, _H2, _Hash, _RehashPolicy,
__chc, __cit, __uk>::_Bucket*
_Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal,
_H1, _H2, _Hash, _RehashPolicy, __chc, __cit, __uk>::
_M_allocate_buckets(size_type __n)
{
_Bucket_allocator_type __alloc(_M_node_allocator);
_Bucket* __p = __alloc.allocate(__n);
__builtin_memset(__p, 0, __n * sizeof(_Bucket));
return __p;
}
template<typename _Key, typename _Value,
typename _Allocator, typename _ExtractKey, typename _Equal,
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
bool __chc, bool __cit, bool __uk>
void
_Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal,
_H1, _H2, _Hash, _RehashPolicy, __chc, __cit, __uk>::
_M_deallocate_buckets(_Bucket* __p, size_type __n)
{
_Bucket_allocator_type __alloc(_M_node_allocator);
__alloc.deallocate(__p, __n);
}
template<typename _Key, typename _Value,
typename _Allocator, typename _ExtractKey, typename _Equal,
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
bool __chc, bool __cit, bool __uk>
typename _Hashtable<_Key, _Value, _Allocator, _ExtractKey,
_Equal, _H1, _H2, _Hash, _RehashPolicy,
__chc, __cit, __uk>::_Node*
_Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal,
_H1, _H2, _Hash, _RehashPolicy, __chc, __cit, __uk>::
_M_bucket_begin(size_type __bkt) const
{
_BaseNode* __n = _M_buckets[__bkt];
return __n ? static_cast<_Node*>(__n->_M_nxt) : nullptr;
}
template<typename _Key, typename _Value,
typename _Allocator, typename _ExtractKey, typename _Equal,
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
bool __chc, bool __cit, bool __uk>
_Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal,
_H1, _H2, _Hash, _RehashPolicy, __chc, __cit, __uk>::
_Hashtable(size_type __bucket_hint,
const _H1& __h1, const _H2& __h2, const _Hash& __h,
const _Equal& __eq, const _ExtractKey& __exk,
const allocator_type& __a)
: __detail::_Rehash_base<_RehashPolicy, _Hashtable>(),
__detail::_Hashtable_base<_Key, _Value, _ExtractKey, _Equal,
_H1, _H2, _Hash, __chc>(__exk, __h1, __h2, __h,
__eq),
__detail::_Map_base<_Key, _Value, _ExtractKey, __uk, _Hashtable>(),
_M_node_allocator(__a),
_M_bucket_count(0),
_M_element_count(0),
_M_rehash_policy()
{
_M_bucket_count = _M_rehash_policy._M_next_bkt(__bucket_hint);
// We don't want the rehash policy to ask for the hashtable to shrink
// on the first insertion so we need to reset its previous resize level.
_M_rehash_policy._M_prev_resize = 0;
_M_buckets = _M_allocate_buckets(_M_bucket_count);
}
template<typename _Key, typename _Value,
typename _Allocator, typename _ExtractKey, typename _Equal,
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
bool __chc, bool __cit, bool __uk>
template<typename _InputIterator>
_Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal,
_H1, _H2, _Hash, _RehashPolicy, __chc, __cit, __uk>::
_Hashtable(_InputIterator __f, _InputIterator __l,
size_type __bucket_hint,
const _H1& __h1, const _H2& __h2, const _Hash& __h,
const _Equal& __eq, const _ExtractKey& __exk,
const allocator_type& __a)
: __detail::_Rehash_base<_RehashPolicy, _Hashtable>(),
__detail::_Hashtable_base<_Key, _Value, _ExtractKey, _Equal,
_H1, _H2, _Hash, __chc>(__exk, __h1, __h2, __h,
__eq),
__detail::_Map_base<_Key, _Value, _ExtractKey, __uk, _Hashtable>(),
_M_node_allocator(__a),
_M_bucket_count(0),
_M_element_count(0),
_M_rehash_policy()
{
_M_bucket_count = std::max(_M_rehash_policy._M_next_bkt(__bucket_hint),
_M_rehash_policy.
_M_bkt_for_elements(__detail::
__distance_fw(__f,
__l)));
// We don't want the rehash policy to ask for the hashtable to shrink
// on the first insertion so we need to reset its previous resize
// level.
_M_rehash_policy._M_prev_resize = 0;
_M_buckets = _M_allocate_buckets(_M_bucket_count);
__try
{
for (; __f != __l; ++__f)
this->insert(*__f);
}
__catch(...)
{
clear();
_M_deallocate_buckets(_M_buckets, _M_bucket_count);
__throw_exception_again;
}
}
template<typename _Key, typename _Value,
typename _Allocator, typename _ExtractKey, typename _Equal,
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
bool __chc, bool __cit, bool __uk>
_Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal,
_H1, _H2, _Hash, _RehashPolicy, __chc, __cit, __uk>::
_Hashtable(const _Hashtable& __ht)
: __detail::_Rehash_base<_RehashPolicy, _Hashtable>(__ht),
__detail::_Hashtable_base<_Key, _Value, _ExtractKey, _Equal,
_H1, _H2, _Hash, __chc>(__ht),
__detail::_Map_base<_Key, _Value, _ExtractKey, __uk, _Hashtable>(__ht),
_M_node_allocator(__ht._M_node_allocator),
_M_bucket_count(__ht._M_bucket_count),
_M_element_count(__ht._M_element_count),
_M_rehash_policy(__ht._M_rehash_policy)
{
_M_buckets = _M_allocate_buckets(_M_bucket_count);
__try
{
if (!__ht._M_before_begin._M_nxt)
return;
// First deal with the special first node pointed to by
// _M_before_begin.
const _Node* __ht_n = __ht._M_begin();
_Node* __this_n = _M_allocate_node(__ht_n->_M_v);
this->_M_copy_code(__this_n, __ht_n);
_M_before_begin._M_nxt = __this_n;
_M_buckets[_M_bucket_index(__this_n)] = &_M_before_begin;
// Then deal with other nodes.
_BaseNode* __prev_n = __this_n;
for (__ht_n = __ht_n->_M_next(); __ht_n; __ht_n = __ht_n->_M_next())
{
__this_n = _M_allocate_node(__ht_n->_M_v);
__prev_n->_M_nxt = __this_n;
this->_M_copy_code(__this_n, __ht_n);
size_type __bkt = _M_bucket_index(__this_n);
if (!_M_buckets[__bkt])
_M_buckets[__bkt] = __prev_n;
__prev_n = __this_n;
}
}
__catch(...)
{
clear();
_M_deallocate_buckets(_M_buckets, _M_bucket_count);
__throw_exception_again;
}
}
template<typename _Key, typename _Value,
typename _Allocator, typename _ExtractKey, typename _Equal,
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
bool __chc, bool __cit, bool __uk>
_Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal,
_H1, _H2, _Hash, _RehashPolicy, __chc, __cit, __uk>::
_Hashtable(_Hashtable&& __ht)
: __detail::_Rehash_base<_RehashPolicy, _Hashtable>(__ht),
__detail::_Hashtable_base<_Key, _Value, _ExtractKey, _Equal,
_H1, _H2, _Hash, __chc>(__ht),
__detail::_Map_base<_Key, _Value, _ExtractKey, __uk, _Hashtable>(__ht),
_M_node_allocator(std::move(__ht._M_node_allocator)),
_M_buckets(__ht._M_buckets),
_M_bucket_count(__ht._M_bucket_count),
_M_before_begin(__ht._M_before_begin._M_nxt),
_M_element_count(__ht._M_element_count),
_M_rehash_policy(__ht._M_rehash_policy)
{
// Update, if necessary, bucket pointing to before begin that hasn't move.
if (_M_begin())
_M_buckets[_M_bucket_index(_M_begin())] = &_M_before_begin;
__ht._M_rehash_policy = _RehashPolicy();
__ht._M_bucket_count = __ht._M_rehash_policy._M_next_bkt(0);
__ht._M_buckets = __ht._M_allocate_buckets(__ht._M_bucket_count);
__ht._M_before_begin._M_nxt = nullptr;
__ht._M_element_count = 0;
}
template<typename _Key, typename _Value,
typename _Allocator, typename _ExtractKey, typename _Equal,
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
bool __chc, bool __cit, bool __uk>
_Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal,
_H1, _H2, _Hash, _RehashPolicy, __chc, __cit, __uk>::
~_Hashtable() noexcept
{
clear();
_M_deallocate_buckets(_M_buckets, _M_bucket_count);
}
template<typename _Key, typename _Value,
typename _Allocator, typename _ExtractKey, typename _Equal,
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
bool __chc, bool __cit, bool __uk>
void
_Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal,
_H1, _H2, _Hash, _RehashPolicy, __chc, __cit, __uk>::
swap(_Hashtable& __x)
{
// The only base class with member variables is hash_code_base. We
// define _Hash_code_base::_M_swap because different specializations
// have different members.
this->_M_swap(__x);
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// 431. Swapping containers with unequal allocators.
std::__alloc_swap<_Node_allocator_type>::_S_do_it(_M_node_allocator,
__x._M_node_allocator);
std::swap(_M_rehash_policy, __x._M_rehash_policy);
std::swap(_M_buckets, __x._M_buckets);
std::swap(_M_bucket_count, __x._M_bucket_count);
std::swap(_M_before_begin._M_nxt, __x._M_before_begin._M_nxt);
std::swap(_M_element_count, __x._M_element_count);
// Fix buckets containing the _M_before_begin pointers that can't be
// swapped.
if (_M_begin())
_M_buckets[_M_bucket_index(_M_begin())] = &_M_before_begin;
if (__x._M_begin())
__x._M_buckets[__x._M_bucket_index(__x._M_begin())]
= &(__x._M_before_begin);
}
template<typename _Key, typename _Value,
typename _Allocator, typename _ExtractKey, typename _Equal,
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
bool __chc, bool __cit, bool __uk>
void
_Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal,
_H1, _H2, _Hash, _RehashPolicy, __chc, __cit, __uk>::
__rehash_policy(const _RehashPolicy& __pol)
{
size_type __n_bkt = __pol._M_bkt_for_elements(_M_element_count);
if (__n_bkt != _M_bucket_count)
_M_rehash(__n_bkt, _M_rehash_policy._M_state());
_M_rehash_policy = __pol;
}
template<typename _Key, typename _Value,
typename _Allocator, typename _ExtractKey, typename _Equal,
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
bool __chc, bool __cit, bool __uk>
typename _Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal,
_H1, _H2, _Hash, _RehashPolicy,
__chc, __cit, __uk>::iterator
_Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal,
_H1, _H2, _Hash, _RehashPolicy, __chc, __cit, __uk>::
find(const key_type& __k)
{
typename _Hashtable::_Hash_code_type __code = this->_M_hash_code(__k);
std::size_t __n = _M_bucket_index(__k, __code);
_Node* __p = _M_find_node(__n, __k, __code);
return __p ? iterator(__p) : this->end();
}
template<typename _Key, typename _Value,
typename _Allocator, typename _ExtractKey, typename _Equal,
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
bool __chc, bool __cit, bool __uk>
typename _Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal,
_H1, _H2, _Hash, _RehashPolicy,
__chc, __cit, __uk>::const_iterator
_Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal,
_H1, _H2, _Hash, _RehashPolicy, __chc, __cit, __uk>::
find(const key_type& __k) const
{
typename _Hashtable::_Hash_code_type __code = this->_M_hash_code(__k);
std::size_t __n = _M_bucket_index(__k, __code);
_Node* __p = _M_find_node(__n, __k, __code);
return __p ? const_iterator(__p) : this->end();
}
template<typename _Key, typename _Value,
typename _Allocator, typename _ExtractKey, typename _Equal,
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
bool __chc, bool __cit, bool __uk>
typename _Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal,
_H1, _H2, _Hash, _RehashPolicy,
__chc, __cit, __uk>::size_type
_Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal,
_H1, _H2, _Hash, _RehashPolicy, __chc, __cit, __uk>::
count(const key_type& __k) const
{
typename _Hashtable::_Hash_code_type __code = this->_M_hash_code(__k);
std::size_t __n = _M_bucket_index(__k, __code);
_Node* __p = _M_bucket_begin(__n);
if (!__p)
return 0;
std::size_t __result = 0;
for (;; __p = __p->_M_next())
{
if (this->_M_equals(__k, __code, __p))
++__result;
else if (__result)
// All equivalent values are next to each other, if we found a not
// equivalent value after an equivalent one it means that we won't
// find anymore an equivalent value.
break;
if (!__p->_M_nxt || _M_bucket_index(__p->_M_next()) != __n)
break;
}
return __result;
}
template<typename _Key, typename _Value,
typename _Allocator, typename _ExtractKey, typename _Equal,
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
bool __chc, bool __cit, bool __uk>
std::pair<typename _Hashtable<_Key, _Value, _Allocator,
_ExtractKey, _Equal, _H1,
_H2, _Hash, _RehashPolicy,
__chc, __cit, __uk>::iterator,
typename _Hashtable<_Key, _Value, _Allocator,
_ExtractKey, _Equal, _H1,
_H2, _Hash, _RehashPolicy,
__chc, __cit, __uk>::iterator>
_Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal,
_H1, _H2, _Hash, _RehashPolicy, __chc, __cit, __uk>::
equal_range(const key_type& __k)
{
typename _Hashtable::_Hash_code_type __code = this->_M_hash_code(__k);
std::size_t __n = _M_bucket_index(__k, __code);
_Node* __p = _M_find_node(__n, __k, __code);
if (__p)
{
_Node* __p1 = __p->_M_next();
while (__p1 && _M_bucket_index(__p1) == __n
&& this->_M_equals(__k, __code, __p1))
__p1 = __p1->_M_next();
return std::make_pair(iterator(__p), iterator(__p1));
}
else
return std::make_pair(this->end(), this->end());
}
template<typename _Key, typename _Value,
typename _Allocator, typename _ExtractKey, typename _Equal,
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
bool __chc, bool __cit, bool __uk>
std::pair<typename _Hashtable<_Key, _Value, _Allocator,
_ExtractKey, _Equal, _H1,
_H2, _Hash, _RehashPolicy,
__chc, __cit, __uk>::const_iterator,
typename _Hashtable<_Key, _Value, _Allocator,
_ExtractKey, _Equal, _H1,
_H2, _Hash, _RehashPolicy,
__chc, __cit, __uk>::const_iterator>
_Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal,
_H1, _H2, _Hash, _RehashPolicy, __chc, __cit, __uk>::
equal_range(const key_type& __k) const
{
typename _Hashtable::_Hash_code_type __code = this->_M_hash_code(__k);
std::size_t __n = _M_bucket_index(__k, __code);
_Node* __p = _M_find_node(__n, __k, __code);
if (__p)
{
_Node* __p1 = __p->_M_next();
while (__p1 && _M_bucket_index(__p1) == __n
&& this->_M_equals(__k, __code, __p1))
__p1 = __p1->_M_next();
return std::make_pair(const_iterator(__p), const_iterator(__p1));
}
else
return std::make_pair(this->end(), this->end());
}
// Find the node whose key compares equal to k in the bucket n. Return nullptr
// if no node is found.
template<typename _Key, typename _Value,
typename _Allocator, typename _ExtractKey, typename _Equal,
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
bool __chc, bool __cit, bool __uk>
typename _Hashtable<_Key, _Value, _Allocator, _ExtractKey,
_Equal, _H1, _H2, _Hash, _RehashPolicy,
__chc, __cit, __uk>::_BaseNode*
_Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal,
_H1, _H2, _Hash, _RehashPolicy, __chc, __cit, __uk>::
_M_find_before_node(size_type __n, const key_type& __k,
typename _Hashtable::_Hash_code_type __code) const
{
_BaseNode* __prev_p = _M_buckets[__n];
if (!__prev_p)
return nullptr;
_Node* __p = static_cast<_Node*>(__prev_p->_M_nxt);
for (;; __p = __p->_M_next())
{
if (this->_M_equals(__k, __code, __p))
return __prev_p;
if (!(__p->_M_nxt) || _M_bucket_index(__p->_M_next()) != __n)
break;
__prev_p = __p;
}
return nullptr;
}
template<typename _Key, typename _Value,
typename _Allocator, typename _ExtractKey, typename _Equal,
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
bool __chc, bool __cit, bool __uk>
void
_Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal,
_H1, _H2, _Hash, _RehashPolicy, __chc, __cit, __uk>::
_M_insert_bucket_begin(size_type __bkt, _Node* __new_node)
{
if (_M_buckets[__bkt])
{
// Bucket is not empty, we just need to insert the new node after the
// bucket before begin.
__new_node->_M_nxt = _M_buckets[__bkt]->_M_nxt;
_M_buckets[__bkt]->_M_nxt = __new_node;
}
else
{
// The bucket is empty, the new node is inserted at the beginning of
// the singly linked list and the bucket will contain _M_before_begin
// pointer.
__new_node->_M_nxt = _M_before_begin._M_nxt;
_M_before_begin._M_nxt = __new_node;
if (__new_node->_M_nxt)
// We must update former begin bucket that is pointing to
// _M_before_begin.
_M_buckets[_M_bucket_index(__new_node->_M_next())] = __new_node;
_M_buckets[__bkt] = &_M_before_begin;
}
}
template<typename _Key, typename _Value,
typename _Allocator, typename _ExtractKey, typename _Equal,
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
bool __chc, bool __cit, bool __uk>
void
_Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal,
_H1, _H2, _Hash, _RehashPolicy, __chc, __cit, __uk>::
_M_remove_bucket_begin(size_type __bkt, _Node* __next, size_type __next_bkt)
{
if (!__next || __next_bkt != __bkt)
{
// Bucket is now empty
// First update next bucket if any
if (__next)
_M_buckets[__next_bkt] = _M_buckets[__bkt];
// Second update before begin node if necessary
if (&_M_before_begin == _M_buckets[__bkt])
_M_before_begin._M_nxt = __next;
_M_buckets[__bkt] = nullptr;
}
}
template<typename _Key, typename _Value,
typename _Allocator, typename _ExtractKey, typename _Equal,
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
bool __chc, bool __cit, bool __uk>
typename _Hashtable<_Key, _Value, _Allocator, _ExtractKey,
_Equal, _H1, _H2, _Hash, _RehashPolicy,
__chc, __cit, __uk>::_BaseNode*
_Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal,
_H1, _H2, _Hash, _RehashPolicy, __chc, __cit, __uk>::
_M_get_previous_node(size_type __bkt, _BaseNode* __n)
{
_BaseNode* __prev_n = _M_buckets[__bkt];
while (__prev_n->_M_nxt != __n)
__prev_n = __prev_n->_M_nxt;
return __prev_n;
}
template<typename _Key, typename _Value,
typename _Allocator, typename _ExtractKey, typename _Equal,
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
bool __chc, bool __cit, bool __uk>
template<typename... _Args>
std::pair<typename _Hashtable<_Key, _Value, _Allocator,
_ExtractKey, _Equal, _H1,
_H2, _Hash, _RehashPolicy,
__chc, __cit, __uk>::iterator, bool>
_Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal,
_H1, _H2, _Hash, _RehashPolicy, __chc, __cit, __uk>::
_M_emplace(std::true_type, _Args&&... __args)
{
// First build the node to get access to the hash code
_Node* __new_node = _M_allocate_node(std::forward<_Args>(__args)...);
__try
{
const key_type& __k = this->_M_extract()(__new_node->_M_v);
typename _Hashtable::_Hash_code_type __code
= this->_M_hash_code(__k);
size_type __bkt = _M_bucket_index(__k, __code);
if (_Node* __p = _M_find_node(__bkt, __k, __code))
{
// There is already an equivalent node, no insertion
_M_deallocate_node(__new_node);
return std::make_pair(iterator(__p), false);
}
// We are going to insert this node
this->_M_store_code(__new_node, __code);
const _RehashPolicyState& __saved_state
= _M_rehash_policy._M_state();
std::pair<bool, std::size_t> __do_rehash
= _M_rehash_policy._M_need_rehash(_M_bucket_count,
_M_element_count, 1);
if (__do_rehash.first)
{
_M_rehash(__do_rehash.second, __saved_state);
__bkt = _M_bucket_index(__k, __code);
}
_M_insert_bucket_begin(__bkt, __new_node);
++_M_element_count;
return std::make_pair(iterator(__new_node), true);
}
__catch(...)
{
_M_deallocate_node(__new_node);
__throw_exception_again;
}
}
template<typename _Key, typename _Value,
typename _Allocator, typename _ExtractKey, typename _Equal,
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
bool __chc, bool __cit, bool __uk>
template<typename... _Args>
typename _Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal,
_H1, _H2, _Hash, _RehashPolicy,
__chc, __cit, __uk>::iterator
_Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal,
_H1, _H2, _Hash, _RehashPolicy, __chc, __cit, __uk>::
_M_emplace(std::false_type, _Args&&... __args)
{
const _RehashPolicyState& __saved_state = _M_rehash_policy._M_state();
std::pair<bool, std::size_t> __do_rehash
= _M_rehash_policy._M_need_rehash(_M_bucket_count,
_M_element_count, 1);
// First build the node to get its hash code.
_Node* __new_node = _M_allocate_node(std::forward<_Args>(__args)...);
__try
{
const key_type& __k = this->_M_extract()(__new_node->_M_v);
typename _Hashtable::_Hash_code_type __code
= this->_M_hash_code(__k);
this->_M_store_code(__new_node, __code);
// Second, do rehash if necessary.
if (__do_rehash.first)
_M_rehash(__do_rehash.second, __saved_state);
// Third, find the node before an equivalent one.
size_type __bkt = _M_bucket_index(__k, __code);
_BaseNode* __prev = _M_find_before_node(__bkt, __k, __code);
if (__prev)
{
// Insert after the node before the equivalent one.
__new_node->_M_nxt = __prev->_M_nxt;
__prev->_M_nxt = __new_node;
}
else
// The inserted node has no equivalent in the hashtable. We must
// insert the new node at the beginning of the bucket to preserve
// equivalent elements relative positions.
_M_insert_bucket_begin(__bkt, __new_node);
++_M_element_count;
return iterator(__new_node);
}
__catch(...)
{
_M_deallocate_node(__new_node);
__throw_exception_again;
}
}
// Insert v in bucket n (assumes no element with its key already present).
template<typename _Key, typename _Value,
typename _Allocator, typename _ExtractKey, typename _Equal,
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
bool __chc, bool __cit, bool __uk>
template<typename _Arg>
typename _Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal,
_H1, _H2, _Hash, _RehashPolicy,
__chc, __cit, __uk>::iterator
_Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal,
_H1, _H2, _Hash, _RehashPolicy, __chc, __cit, __uk>::
_M_insert_bucket(_Arg&& __v, size_type __n,
typename _Hashtable::_Hash_code_type __code)
{
const _RehashPolicyState& __saved_state = _M_rehash_policy._M_state();
std::pair<bool, std::size_t> __do_rehash
= _M_rehash_policy._M_need_rehash(_M_bucket_count,
_M_element_count, 1);
if (__do_rehash.first)
{
const key_type& __k = this->_M_extract()(__v);
__n = _HCBase::_M_bucket_index(__k, __code, __do_rehash.second);
}
_Node* __new_node = nullptr;
__try
{
// Allocate the new node before doing the rehash so that we
// don't do a rehash if the allocation throws.
__new_node = _M_allocate_node(std::forward<_Arg>(__v));
this->_M_store_code(__new_node, __code);
if (__do_rehash.first)
_M_rehash(__do_rehash.second, __saved_state);
_M_insert_bucket_begin(__n, __new_node);
++_M_element_count;
return iterator(__new_node);
}
__catch(...)
{
if (!__new_node)
_M_rehash_policy._M_reset(__saved_state);
else
_M_deallocate_node(__new_node);
__throw_exception_again;
}
}
// Insert v if no element with its key is already present.
template<typename _Key, typename _Value,
typename _Allocator, typename _ExtractKey, typename _Equal,
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
bool __chc, bool __cit, bool __uk>
template<typename _Arg>
std::pair<typename _Hashtable<_Key, _Value, _Allocator,
_ExtractKey, _Equal, _H1,
_H2, _Hash, _RehashPolicy,
__chc, __cit, __uk>::iterator, bool>
_Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal,
_H1, _H2, _Hash, _RehashPolicy, __chc, __cit, __uk>::
_M_insert(_Arg&& __v, std::true_type)
{
const key_type& __k = this->_M_extract()(__v);
typename _Hashtable::_Hash_code_type __code = this->_M_hash_code(__k);
size_type __n = _M_bucket_index(__k, __code);
if (_Node* __p = _M_find_node(__n, __k, __code))
return std::make_pair(iterator(__p), false);
return std::make_pair(_M_insert_bucket(std::forward<_Arg>(__v),
__n, __code), true);
}
// Insert v unconditionally.
template<typename _Key, typename _Value,
typename _Allocator, typename _ExtractKey, typename _Equal,
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
bool __chc, bool __cit, bool __uk>
template<typename _Arg>
typename _Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal,
_H1, _H2, _Hash, _RehashPolicy,
__chc, __cit, __uk>::iterator
_Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal,
_H1, _H2, _Hash, _RehashPolicy, __chc, __cit, __uk>::
_M_insert(_Arg&& __v, std::false_type)
{
const _RehashPolicyState& __saved_state = _M_rehash_policy._M_state();
std::pair<bool, std::size_t> __do_rehash
= _M_rehash_policy._M_need_rehash(_M_bucket_count,
_M_element_count, 1);
// First compute the hash code so that we don't do anything if it throws.
typename _Hashtable::_Hash_code_type __code
= this->_M_hash_code(this->_M_extract()(__v));
_Node* __new_node = nullptr;
__try
{
// Second allocate new node so that we don't rehash if it throws.
__new_node = _M_allocate_node(std::forward<_Arg>(__v));
this->_M_store_code(__new_node, __code);
if (__do_rehash.first)
_M_rehash(__do_rehash.second, __saved_state);
// Third, find the node before an equivalent one.
size_type __bkt = _M_bucket_index(__new_node);
_BaseNode* __prev
= _M_find_before_node(__bkt, this->_M_extract()(__new_node->_M_v),
__code);
if (__prev)
{
// Insert after the node before the equivalent one.
__new_node->_M_nxt = __prev->_M_nxt;
__prev->_M_nxt = __new_node;
}
else
// The inserted node has no equivalent in the hashtable. We must
// insert the new node at the beginning of the bucket to preserve
// equivalent elements relative positions.
_M_insert_bucket_begin(__bkt, __new_node);
++_M_element_count;
return iterator(__new_node);
}
__catch(...)
{
if (!__new_node)
_M_rehash_policy._M_reset(__saved_state);
else
_M_deallocate_node(__new_node);
__throw_exception_again;
}
}
template<typename _Key, typename _Value,
typename _Allocator, typename _ExtractKey, typename _Equal,
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
bool __chc, bool __cit, bool __uk>
template<typename _InputIterator>
void
_Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal,
_H1, _H2, _Hash, _RehashPolicy, __chc, __cit, __uk>::
insert(_InputIterator __first, _InputIterator __last)
{
size_type __n_elt = __detail::__distance_fw(__first, __last);
const _RehashPolicyState& __saved_state = _M_rehash_policy._M_state();
std::pair<bool, std::size_t> __do_rehash
= _M_rehash_policy._M_need_rehash(_M_bucket_count,
_M_element_count, __n_elt);
if (__do_rehash.first)
_M_rehash(__do_rehash.second, __saved_state);
for (; __first != __last; ++__first)
this->insert(*__first);
}
template<typename _Key, typename _Value,
typename _Allocator, typename _ExtractKey, typename _Equal,
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
bool __chc, bool __cit, bool __uk>
typename _Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal,
_H1, _H2, _Hash, _RehashPolicy,
__chc, __cit, __uk>::iterator
_Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal,
_H1, _H2, _Hash, _RehashPolicy, __chc, __cit, __uk>::
erase(const_iterator __it)
{
_Node* __n = __it._M_cur;
std::size_t __bkt = _M_bucket_index(__n);
// Look for previous node to unlink it from the erased one, this is why
// we need buckets to contain the before begin to make this research fast.
_BaseNode* __prev_n = _M_get_previous_node(__bkt, __n);
if (__n == _M_bucket_begin(__bkt))
_M_remove_bucket_begin(__bkt, __n->_M_next(),
__n->_M_nxt ? _M_bucket_index(__n->_M_next()) : 0);
else if (__n->_M_nxt)
{
size_type __next_bkt = _M_bucket_index(__n->_M_next());
if (__next_bkt != __bkt)
_M_buckets[__next_bkt] = __prev_n;
}
__prev_n->_M_nxt = __n->_M_nxt;
iterator __result(__n->_M_next());
_M_deallocate_node(__n);
--_M_element_count;
return __result;
}
template<typename _Key, typename _Value,
typename _Allocator, typename _ExtractKey, typename _Equal,
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
bool __chc, bool __cit, bool __uk>
typename _Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal,
_H1, _H2, _Hash, _RehashPolicy,
__chc, __cit, __uk>::size_type
_Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal,
_H1, _H2, _Hash, _RehashPolicy, __chc, __cit, __uk>::
erase(const key_type& __k)
{
typename _Hashtable::_Hash_code_type __code = this->_M_hash_code(__k);
std::size_t __bkt = _M_bucket_index(__k, __code);
// Look for the node before the first matching node.
_BaseNode* __prev_n = _M_find_before_node(__bkt, __k, __code);
if (!__prev_n)
return 0;
_Node* __n = static_cast<_Node*>(__prev_n->_M_nxt);
bool __is_bucket_begin = _M_buckets[__bkt] == __prev_n;
// We found a matching node, start deallocation loop from it
std::size_t __next_bkt = __bkt;
_Node* __next_n = __n;
size_type __result = 0;
_Node* __saved_n = nullptr;
do
{
_Node* __p = __next_n;
__next_n = __p->_M_next();
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// 526. Is it undefined if a function in the standard changes
// in parameters?
if (std::__addressof(this->_M_extract()(__p->_M_v))
!= std::__addressof(__k))
_M_deallocate_node(__p);
else
__saved_n = __p;
--_M_element_count;
++__result;
if (!__next_n)
break;
__next_bkt = _M_bucket_index(__next_n);
}
while (__next_bkt == __bkt && this->_M_equals(__k, __code, __next_n));
if (__saved_n)
_M_deallocate_node(__saved_n);
if (__is_bucket_begin)
_M_remove_bucket_begin(__bkt, __next_n, __next_bkt);
else if (__next_n && __next_bkt != __bkt)
_M_buckets[__next_bkt] = __prev_n;
if (__prev_n)
__prev_n->_M_nxt = __next_n;
return __result;
}
template<typename _Key, typename _Value,
typename _Allocator, typename _ExtractKey, typename _Equal,
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
bool __chc, bool __cit, bool __uk>
typename _Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal,
_H1, _H2, _Hash, _RehashPolicy,
__chc, __cit, __uk>::iterator
_Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal,
_H1, _H2, _Hash, _RehashPolicy, __chc, __cit, __uk>::
erase(const_iterator __first, const_iterator __last)
{
_Node* __n = __first._M_cur;
_Node* __last_n = __last._M_cur;
if (__n == __last_n)
return iterator(__n);
std::size_t __bkt = _M_bucket_index(__n);
_BaseNode* __prev_n = _M_get_previous_node(__bkt, __n);
bool __is_bucket_begin = __n == _M_bucket_begin(__bkt);
std::size_t __n_bkt = __bkt;
for (;;)
{
do
{
_Node* __tmp = __n;
__n = __n->_M_next();
_M_deallocate_node(__tmp);
--_M_element_count;
if (!__n)
break;
__n_bkt = _M_bucket_index(__n);
}
while (__n != __last_n && __n_bkt == __bkt);
if (__is_bucket_begin)
_M_remove_bucket_begin(__bkt, __n, __n_bkt);
if (__n == __last_n)
break;
__is_bucket_begin = true;
__bkt = __n_bkt;
}
if (__n && (__n_bkt != __bkt || __is_bucket_begin))
_M_buckets[__n_bkt] = __prev_n;
__prev_n->_M_nxt = __n;
return iterator(__n);
}
template<typename _Key, typename _Value,
typename _Allocator, typename _ExtractKey, typename _Equal,
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
bool __chc, bool __cit, bool __uk>
void
_Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal,
_H1, _H2, _Hash, _RehashPolicy, __chc, __cit, __uk>::
clear() noexcept
{
_M_deallocate_nodes(_M_begin());
__builtin_memset(_M_buckets, 0, _M_bucket_count * sizeof(_Bucket));
_M_element_count = 0;
_M_before_begin._M_nxt = nullptr;
}
template<typename _Key, typename _Value,
typename _Allocator, typename _ExtractKey, typename _Equal,
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
bool __chc, bool __cit, bool __uk>
void
_Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal,
_H1, _H2, _Hash, _RehashPolicy, __chc, __cit, __uk>::
rehash(size_type __n)
{
const _RehashPolicyState& __saved_state = _M_rehash_policy._M_state();
_M_rehash(std::max(_M_rehash_policy._M_next_bkt(__n),
_M_rehash_policy._M_bkt_for_elements(_M_element_count
+ 1)),
__saved_state);
}
template<typename _Key, typename _Value,
typename _Allocator, typename _ExtractKey, typename _Equal,
typename _H1, typename _H2, typename _Hash, typename _RehashPolicy,
bool __chc, bool __cit, bool __uk>
void
_Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal,
_H1, _H2, _Hash, _RehashPolicy, __chc, __cit, __uk>::
_M_rehash(size_type __n, const _RehashPolicyState& __state)
{
__try
{
_Bucket* __new_buckets = _M_allocate_buckets(__n);
_Node* __p = _M_begin();
_M_before_begin._M_nxt = nullptr;
std::size_t __cur_bbegin_bkt;
while (__p)
{
_Node* __next = __p->_M_next();
std::size_t __new_index = _HCBase::_M_bucket_index(__p, __n);
if (!__new_buckets[__new_index])
{
__p->_M_nxt = _M_before_begin._M_nxt;
_M_before_begin._M_nxt = __p;
__new_buckets[__new_index] = &_M_before_begin;
if (__p->_M_nxt)
__new_buckets[__cur_bbegin_bkt] = __p;
__cur_bbegin_bkt = __new_index;
}
else
{
__p->_M_nxt = __new_buckets[__new_index]->_M_nxt;
__new_buckets[__new_index]->_M_nxt = __p;
}
__p = __next;
}
_M_deallocate_buckets(_M_buckets, _M_bucket_count);
_M_bucket_count = __n;
_M_buckets = __new_buckets;
}
__catch(...)
{
// A failure here means that buckets allocation failed. We only
// have to restore hash policy previous state.
_M_rehash_policy._M_reset(__state);
__throw_exception_again;
}
}
_GLIBCXX_END_NAMESPACE_VERSION
} // namespace std
#endif // _HASHTABLE_H
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