libstdc++
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#include <hashtable.h>
Public Types | |
typedef _Alloc | allocator_type |
using | const_iterator = typename __hashtable_base::const_iterator |
using | const_local_iterator = typename __hashtable_base::const_local_iterator |
typedef __value_alloc_traits::const_pointer | const_pointer |
typedef const value_type & | const_reference |
using | difference_type = typename __hashtable_base::difference_type |
using | iterator = typename __hashtable_base::iterator |
typedef _Equal | key_equal |
typedef _Key | key_type |
using | local_iterator = typename __hashtable_base::local_iterator |
typedef __value_alloc_traits::pointer | pointer |
typedef value_type & | reference |
using | size_type = typename __hashtable_base::size_type |
typedef _Value | value_type |
Public Member Functions | |
_Hashtable (_Hashtable &&) noexcept | |
_Hashtable (_Hashtable &&, const allocator_type &) | |
template<typename _InputIterator > | |
_Hashtable (_InputIterator __f, _InputIterator __l, size_type __n=0, const _H1 &__hf=_H1(), const key_equal &__eql=key_equal(), const allocator_type &__a=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 (const _Hashtable &, const allocator_type &) | |
_Hashtable (const allocator_type &__a) | |
_Hashtable (initializer_list< value_type > __l, size_type __n=0, const _H1 &__hf=_H1(), const key_equal &__eql=key_equal(), const allocator_type &__a=allocator_type()) | |
_Hashtable (size_type __bucket_hint, const _H1 &, const _H2 &, const _Hash &, const _Equal &, const _ExtractKey &, const allocator_type &) | |
_Hashtable (size_type __n, const _H1 &__hf=_H1(), const key_equal &__eql=key_equal(), const allocator_type &__a=allocator_type()) | |
const _RehashPolicy & | __rehash_policy () const |
void | __rehash_policy (const _RehashPolicy &__pol) |
template<typename... _Args> | |
auto | _M_emplace (const_iterator __hint, std::false_type, _Args &&... __args) -> iterator |
template<typename... _Args> | |
auto | _M_emplace (std::true_type, _Args &&... __args) -> pair< iterator, bool > |
template<typename _Arg , typename _NodeGenerator > | |
auto | _M_insert (_Arg &&__v, const _NodeGenerator &__node_gen, std::true_type) -> pair< iterator, bool > |
template<typename _Arg , typename _NodeGenerator > | |
auto | _M_insert (const_iterator __hint, _Arg &&__v, const _NodeGenerator &__node_gen, std::false_type) -> iterator |
const_iterator | begin () const noexcept |
iterator | begin () noexcept |
local_iterator | begin (size_type __n) |
const_local_iterator | begin (size_type __n) const |
size_type | bucket (const key_type &__k) const |
size_type | bucket_count () const noexcept |
size_type | bucket_size (size_type __n) const |
const_iterator | cbegin () const noexcept |
const_local_iterator | cbegin (size_type __n) const |
const_iterator | cend () const noexcept |
const_local_iterator | cend (size_type __n) const |
void | clear () noexcept |
size_type | count (const key_type &__k) const |
template<typename... _Args> | |
__ireturn_type | emplace (_Args &&... __args) |
template<typename... _Args> | |
iterator | emplace_hint (const_iterator __hint, _Args &&... __args) |
bool | empty () const noexcept |
const_iterator | end () const noexcept |
iterator | end () noexcept |
local_iterator | end (size_type __n) |
const_local_iterator | end (size_type __n) const |
std::pair< iterator, iterator > | equal_range (const key_type &__k) |
std::pair< const_iterator, const_iterator > | equal_range (const key_type &__k) const |
size_type | erase (const key_type &__k) |
iterator | erase (const_iterator) |
iterator | erase (const_iterator, const_iterator) |
iterator | erase (iterator __it) |
iterator | find (const key_type &__k) |
const_iterator | find (const key_type &__k) const |
allocator_type | get_allocator () const noexcept |
key_equal | key_eq () const |
float | load_factor () const noexcept |
size_type | max_bucket_count () const noexcept |
size_type | max_size () const noexcept |
_Hashtable & | operator= (_Hashtable &&__ht) noexcept(__node_alloc_traits::_S_nothrow_move() &&is_nothrow_move_assignable< _H1 >::value &&is_nothrow_move_assignable< _Equal >::value) |
_Hashtable & | operator= (const _Hashtable &__ht) |
_Hashtable & | operator= (initializer_list< value_type > __l) |
void | rehash (size_type __n) |
size_type | size () const noexcept |
void | swap (_Hashtable &) noexcept(__and_< __is_nothrow_swappable< _H1 >, __is_nothrow_swappable< _Equal > >::value) |
Protected Member Functions | |
size_type | _M_bucket_index (__node_type *__n) const noexcept |
size_type | _M_bucket_index (const key_type &__k, __hash_code __c) const |
template<typename... _Args> | |
iterator | _M_emplace (const_iterator, std::false_type, _Args &&... __args) |
template<typename... _Args> | |
iterator | _M_emplace (const_iterator, std::true_type __uk, _Args &&... __args) |
template<typename... _Args> | |
iterator | _M_emplace (std::false_type __uk, _Args &&... __args) |
template<typename... _Args> | |
std::pair< iterator, bool > | _M_emplace (std::true_type, _Args &&... __args) |
_Equal & | _M_eq () |
const _Equal & | _M_eq () const |
bool | _M_equals (const _Key &__k, __hash_code __c, __node_type *__n) const |
iterator | _M_erase (size_type __bkt, __node_base *__prev_n, __node_type *__n) |
size_type | _M_erase (std::false_type, const key_type &) |
size_type | _M_erase (std::true_type, const key_type &) |
__node_base * | _M_find_before_node (size_type, const key_type &, __hash_code) const |
__node_type * | _M_find_node (size_type __bkt, const key_type &__key, __hash_code __c) const |
__node_base * | _M_get_previous_node (size_type __bkt, __node_base *__n) |
template<typename _Arg , typename _NodeGenerator > | |
std::pair< iterator, bool > | _M_insert (_Arg &&, const _NodeGenerator &, std::true_type) |
template<typename _Arg , typename _NodeGenerator > | |
iterator | _M_insert (_Arg &&__arg, const _NodeGenerator &__node_gen, std::false_type __uk) |
template<typename _Arg , typename _NodeGenerator > | |
iterator | _M_insert (const_iterator, _Arg &&, const _NodeGenerator &, std::false_type) |
template<typename _Arg , typename _NodeGenerator > | |
iterator | _M_insert (const_iterator, _Arg &&__arg, const _NodeGenerator &__node_gen, std::true_type __uk) |
void | _M_insert_bucket_begin (size_type, __node_type *) |
iterator | _M_insert_multi_node (__node_type *__hint, __hash_code __code, __node_type *__n) |
iterator | _M_insert_unique_node (size_type __bkt, __hash_code __code, __node_type *__n) |
void | _M_remove_bucket_begin (size_type __bkt, __node_type *__next_n, size_type __next_bkt) |
void | _M_swap (_Hashtable_base &__x) |
Friends | |
template<typename _Keya , typename _Valuea , typename _Alloca , typename _ExtractKeya , typename _Equala , typename _H1a , typename _H2a , typename _Hasha , typename _RehashPolicya , typename _Traitsa , bool _Constant_iteratorsa> | |
struct | __detail::_Insert |
template<typename _Keya , typename _Valuea , typename _Alloca , typename _ExtractKeya , typename _Equala , typename _H1a , typename _H2a , typename _Hasha , typename _RehashPolicya , typename _Traitsa > | |
struct | __detail::_Insert_base |
template<typename _Keya , typename _Valuea , typename _Alloca , typename _ExtractKeya , typename _Equala , typename _H1a , typename _H2a , typename _Hasha , typename _RehashPolicya , typename _Traitsa , bool _Unique_keysa> | |
struct | __detail::_Map_base |
Primary class template _Hashtable.
_Value | CopyConstructible type. |
_Key | CopyConstructible type. |
_Alloc | An allocator type ([lib.allocator.requirements]) whose _Alloc::value_type is _Value. As a conforming extension, we allow for _Alloc::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>) |
_Traits | Compile-time class with three boolean std::integral_constant members: __cache_hash_code, __constant_iterators, __unique_keys. |
Each _Hashtable data structure has:
with _Bucket being _Hash_node* and _Hash_node containing:
In terms of Standard containers the hashtable is like the aggregation of:
The non-empty buckets contain the node before the first node in the bucket. This design makes it possible 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::forward_list::before_begin. Empty buckets contain nullptr. Note that one of the non-empty buckets contains &_M_before_begin which is not a dereferenceable node so the node pointer in a bucket shall never be dereferenced, only its next node can be.
Walking through a bucket's nodes requires a check on the hash code to see if each node is still in the bucket. Such a design assumes a quite efficient hash functor and is one of the reasons it is highly advisable 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 the element's hash code and use it to find the bucket index. If the element must be inserted in 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 requires using the hash functor to get the index of the bucket to update. For this reason, when __cache_hash_code is set to false the hash functor must not throw and this is enforced by a static assertion.
Functionality is implemented by decomposition into base classes, where the derived _Hashtable class is used in _Map_base, _Insert, _Rehash_base, and _Equality base classes to access the "this" pointer. _Hashtable_base is used in the base classes as a non-recursive, fully-completed-type so that detailed nested type information, such as iterator type and node type, can be used. This is similar to the "Curiously Recurring Template Pattern" (CRTP) technique, but uses a reconstructed, not explicitly passed, template pattern.
Base class templates are:
Definition at line 173 of file bits/hashtable.h.
typedef _Alloc std::_Hashtable< _Key, _Value, _Alloc, _ExtractKey, _Equal, _H1, _H2, _Hash, _RehashPolicy, _Traits >::allocator_type |
Definition at line 206 of file bits/hashtable.h.
using std::_Hashtable< _Key, _Value, _Alloc, _ExtractKey, _Equal, _H1, _H2, _Hash, _RehashPolicy, _Traits >::const_iterator = typename __hashtable_base::const_iterator |
Definition at line 308 of file bits/hashtable.h.
using std::_Hashtable< _Key, _Value, _Alloc, _ExtractKey, _Equal, _H1, _H2, _Hash, _RehashPolicy, _Traits >::const_local_iterator = typename __hashtable_base:: const_local_iterator |
Definition at line 311 of file bits/hashtable.h.
typedef __value_alloc_traits::const_pointer std::_Hashtable< _Key, _Value, _Alloc, _ExtractKey, _Equal, _H1, _H2, _Hash, _RehashPolicy, _Traits >::const_pointer |
Definition at line 212 of file bits/hashtable.h.
typedef const value_type& std::_Hashtable< _Key, _Value, _Alloc, _ExtractKey, _Equal, _H1, _H2, _Hash, _RehashPolicy, _Traits >::const_reference |
Definition at line 214 of file bits/hashtable.h.
using std::_Hashtable< _Key, _Value, _Alloc, _ExtractKey, _Equal, _H1, _H2, _Hash, _RehashPolicy, _Traits >::difference_type = typename __hashtable_base::difference_type |
Definition at line 305 of file bits/hashtable.h.
using std::_Hashtable< _Key, _Value, _Alloc, _ExtractKey, _Equal, _H1, _H2, _Hash, _RehashPolicy, _Traits >::iterator = typename __hashtable_base::iterator |
Definition at line 307 of file bits/hashtable.h.
typedef _Equal std::_Hashtable< _Key, _Value, _Alloc, _ExtractKey, _Equal, _H1, _H2, _Hash, _RehashPolicy, _Traits >::key_equal |
Definition at line 207 of file bits/hashtable.h.
typedef _Key std::_Hashtable< _Key, _Value, _Alloc, _ExtractKey, _Equal, _H1, _H2, _Hash, _RehashPolicy, _Traits >::key_type |
Definition at line 204 of file bits/hashtable.h.
using std::_Hashtable< _Key, _Value, _Alloc, _ExtractKey, _Equal, _H1, _H2, _Hash, _RehashPolicy, _Traits >::local_iterator = typename __hashtable_base::local_iterator |
Definition at line 310 of file bits/hashtable.h.
typedef __value_alloc_traits::pointer std::_Hashtable< _Key, _Value, _Alloc, _ExtractKey, _Equal, _H1, _H2, _Hash, _RehashPolicy, _Traits >::pointer |
Definition at line 211 of file bits/hashtable.h.
typedef value_type& std::_Hashtable< _Key, _Value, _Alloc, _ExtractKey, _Equal, _H1, _H2, _Hash, _RehashPolicy, _Traits >::reference |
Definition at line 213 of file bits/hashtable.h.
using std::_Hashtable< _Key, _Value, _Alloc, _ExtractKey, _Equal, _H1, _H2, _Hash, _RehashPolicy, _Traits >::size_type = typename __hashtable_base::size_type |
Definition at line 304 of file bits/hashtable.h.
typedef _Value std::_Hashtable< _Key, _Value, _Alloc, _ExtractKey, _Equal, _H1, _H2, _Hash, _RehashPolicy, _Traits >::value_type |
Definition at line 205 of file bits/hashtable.h.
std::_Hashtable< _Key, _Value, _Alloc, _ExtractKey, _Equal, _H1, _H2, _Hash, _RehashPolicy, _Traits >::_Hashtable | ( | size_type | __bucket_hint, |
const _H1 & | __h1, | ||
const _H2 & | __h2, | ||
const _Hash & | __h, | ||
const _Equal & | __eq, | ||
const _ExtractKey & | __exk, | ||
const allocator_type & | __a | ||
) |
Definition at line 935 of file bits/hashtable.h.
std::_Hashtable< _Key, _Value, _Alloc, _ExtractKey, _Equal, _H1, _H2, _Hash, _RehashPolicy, _Traits >::_Hashtable | ( | _InputIterator | __first, |
_InputIterator | __last, | ||
size_type | __bucket_hint, | ||
const _H1 & | __h1, | ||
const _H2 & | __h2, | ||
const _Hash & | __h, | ||
const _Equal & | __eq, | ||
const _ExtractKey & | __exk, | ||
const allocator_type & | __a | ||
) |
Definition at line 956 of file bits/hashtable.h.
std::_Hashtable< _Key, _Value, _Alloc, _ExtractKey, _Equal, _H1, _H2, _Hash, _RehashPolicy, _Traits >::_Hashtable | ( | const _Hashtable< _Key, _Value, _Alloc, _ExtractKey, _Equal, _H1, _H2, _Hash, _RehashPolicy, _Traits > & | __ht | ) |
Definition at line 1232 of file bits/hashtable.h.
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std::_Hashtable< _Key, _Value, _Alloc, _ExtractKey, _Equal, _H1, _H2, _Hash, _RehashPolicy, _Traits >::_Hashtable | ( | const _Hashtable< _Key, _Value, _Alloc, _ExtractKey, _Equal, _H1, _H2, _Hash, _RehashPolicy, _Traits > & | __ht, |
const allocator_type & | __a | ||
) |
Definition at line 1286 of file bits/hashtable.h.
std::_Hashtable< _Key, _Value, _Alloc, _ExtractKey, _Equal, _H1, _H2, _Hash, _RehashPolicy, _Traits >::_Hashtable | ( | _Hashtable< _Key, _Value, _Alloc, _ExtractKey, _Equal, _H1, _H2, _Hash, _RehashPolicy, _Traits > && | __ht, |
const allocator_type & | __a | ||
) |
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auto std::_Hashtable< _Key, _Value, _Alloc, _ExtractKey, _Equal, _H1, _H2, _Hash, _RehashPolicy, _Traits >::_M_emplace | ( | const_iterator | __hint, |
std::false_type | , | ||
_Args &&... | __args | ||
) | -> iterator |
Definition at line 1674 of file bits/hashtable.h.
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auto std::_Hashtable< _Key, _Value, _Alloc, _ExtractKey, _Equal, _H1, _H2, _Hash, _RehashPolicy, _Traits >::_M_emplace | ( | std::true_type | , |
_Args &&... | __args | ||
) | -> pair<iterator, bool> |
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auto std::_Hashtable< _Key, _Value, _Alloc, _ExtractKey, _Equal, _H1, _H2, _Hash, _RehashPolicy, _Traits >::_M_insert | ( | _Arg && | __v, |
const _NodeGenerator & | __node_gen, | ||
std::true_type | |||
) | -> pair<iterator, bool> |
Definition at line 1806 of file bits/hashtable.h.
auto std::_Hashtable< _Key, _Value, _Alloc, _ExtractKey, _Equal, _H1, _H2, _Hash, _RehashPolicy, _Traits >::_M_insert | ( | const_iterator | __hint, |
_Arg && | __v, | ||
const _NodeGenerator & | __node_gen, | ||
std::false_type | |||
) | -> iterator |
Definition at line 1830 of file bits/hashtable.h.
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auto std::_Hashtable< _Key, _Value, _Alloc, _ExtractKey, _Equal, _H1, _H2, _Hash, _RehashPolicy, _Traits >::count | ( | const key_type & | __k | ) | const |
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auto std::_Hashtable< _Key, _Value, _Alloc, _ExtractKey, _Equal, _H1, _H2, _Hash, _RehashPolicy, _Traits >::equal_range | ( | const key_type & | __k | ) |
Definition at line 1480 of file bits/hashtable.h.
auto std::_Hashtable< _Key, _Value, _Alloc, _ExtractKey, _Equal, _H1, _H2, _Hash, _RehashPolicy, _Traits >::equal_range | ( | const key_type & | __k | ) | const |
Definition at line 1507 of file bits/hashtable.h.
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Definition at line 758 of file bits/hashtable.h.
auto std::_Hashtable< _Key, _Value, _Alloc, _ExtractKey, _Equal, _H1, _H2, _Hash, _RehashPolicy, _Traits >::erase | ( | const_iterator | __it | ) |
Definition at line 1851 of file bits/hashtable.h.
auto std::_Hashtable< _Key, _Value, _Alloc, _ExtractKey, _Equal, _H1, _H2, _Hash, _RehashPolicy, _Traits >::erase | ( | const_iterator | __first, |
const_iterator | __last | ||
) |
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Definition at line 754 of file bits/hashtable.h.
auto std::_Hashtable< _Key, _Value, _Alloc, _ExtractKey, _Equal, _H1, _H2, _Hash, _RehashPolicy, _Traits >::find | ( | const key_type & | __k | ) |
Definition at line 1416 of file bits/hashtable.h.
auto std::_Hashtable< _Key, _Value, _Alloc, _ExtractKey, _Equal, _H1, _H2, _Hash, _RehashPolicy, _Traits >::find | ( | const key_type & | __k | ) | const |
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auto std::_Hashtable< _Key, _Value, _Alloc, _ExtractKey, _Equal, _H1, _H2, _Hash, _RehashPolicy, _Traits >::operator= | ( | const _Hashtable< _Key, _Value, _Alloc, _ExtractKey, _Equal, _H1, _H2, _Hash, _RehashPolicy, _Traits > & | __ht | ) |
Definition at line 986 of file bits/hashtable.h.
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Definition at line 473 of file bits/hashtable.h.
void std::_Hashtable< _Key, _Value, _Alloc, _ExtractKey, _Equal, _H1, _H2, _Hash, _RehashPolicy, _Traits >::rehash | ( | size_type | __n | ) |
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