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geode/loader/include/Geode/c++stl/msvc/xhash.hpp
kynex7510 afc4d572ba
Fix C++23 compilation (#644)
2024-03-25 23:21:39 +01:00

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// xhash internal header
// Copyright (c) Microsoft Corporation.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
// Per Apache License, Version 2.0, Section 4, Point b: I (kynex7510) changed this file.
#ifndef _GEODE_XHASH_
#define _GEODE_XHASH_
#include <yvals_core.h>
#if _STL_COMPILER_PREPROCESSOR
#include <cmath>
#include <list>
#include <tuple>
#include <vector>
#include <xbit_ops.h>
#ifdef _SILENCE_STDEXT_HASH_DEPRECATION_WARNINGS
#include <cstring>
#include <cwchar>
#include <xstring>
#endif // _SILENCE_STDEXT_HASH_DEPRECATION_WARNINGS
#if _HAS_CXX17
#include <xnode_handle.h>
#endif // _HAS_CXX17
#pragma pack(push, _CRT_PACKING)
#pragma warning(push, _STL_WARNING_LEVEL)
#pragma warning(disable : _STL_DISABLED_WARNINGS)
_STL_DISABLE_CLANG_WARNINGS
#pragma push_macro("new")
#undef new
// Include the original file for the required structs.
#include <xhash>
namespace geode::stl {
using _STD _Fake_alloc;
// The following types are not accessible from std::list.
template <class _Ty, class _Alloc = _STD allocator<_Ty>>
struct _ListImpl {
using _Mylist = _STD list<_Ty, _Alloc>;
using _Alty = _STD _Rebind_alloc_t<_Alloc, _Ty>;
using _Alty_traits = _STD allocator_traits<_Alty>;
using _Node = _STD _List_node<_Ty, typename _STD allocator_traits<_Alloc>::void_pointer>;
using _Alnode = _STD _Rebind_alloc_t<_Alloc, _Node>;
using _Alnode_traits = _STD allocator_traits<_Alnode>;
using _Nodeptr = typename _Alnode_traits::pointer;
using _Val_types = _STD conditional_t<_STD _Is_simple_alloc_v<_Alnode>, _STD _List_simple_types<_Ty>,
_STD _List_iter_types<_Ty, typename _Alty_traits::size_type, typename _Alty_traits::difference_type,
typename _Alty_traits::pointer, typename _Alty_traits::const_pointer, _Nodeptr>>;
using _Scary_val = _STD _List_val<_Val_types>;
using _PairType = _STD _Compressed_pair<_Alnode, _Scary_val>;
// These methods are required to bypass std::list visibility.
constexpr static size_t MYPAIR_OFFSET = 0;
static _PairType& _List_Mypair(_Mylist& _List) noexcept {
return *reinterpret_cast<_PairType*>(reinterpret_cast<uintptr_t>(&_List) + MYPAIR_OFFSET);
}
static const _PairType& _List_Mypair(const _Mylist& _List) noexcept {
return *reinterpret_cast<_PairType*>(reinterpret_cast<uintptr_t>(&_List) + MYPAIR_OFFSET);
}
static _Alnode& _List_Getal(_Mylist& _List) noexcept {
return _List_Mypair(_List)._Get_first();
}
static const _Alnode& _List_Getal(const _Mylist& _List) noexcept {
return _List_Mypair(_List)._Get_first();
}
};
template <class _Traits>
class _Hash { // hash table -- list with vector of iterators for quick access
protected:
using _MylistImpl = typename _ListImpl<typename _Traits::value_type, typename _Traits::allocator_type>;
using _Mylist = typename _MylistImpl::_Mylist;
using _Alnode = typename /* _Mylist */ _MylistImpl::_Alnode;
using _Alnode_traits = typename /* _Mylist */ _MylistImpl::_Alnode_traits;
using _Node = typename /* _Mylist */ _MylistImpl::_Node;
using _Nodeptr = typename /* _Mylist */ _MylistImpl::_Nodeptr;
using _Mutable_value_type = typename _Traits::_Mutable_value_type;
using _Key_compare = typename _Traits::key_compare;
using _Value_compare = typename _Traits::value_compare;
typename _MylistImpl::_PairType& _List_Mypair() noexcept { return _MylistImpl::_List_Mypair(_List); }
const typename _MylistImpl::_PairType& _List_Mypair() const noexcept { return _MylistImpl::_List_Mypair(_List); }
_Alnode& _List_Getal() noexcept { return _MylistImpl::_List_Getal(_List); }
const _Alnode& _List_Getal() const noexcept { return _MylistImpl::_List_Getal(_List); }
public:
using key_type = typename _Traits::key_type;
using value_type = typename _Mylist::value_type;
using allocator_type = typename _Mylist::allocator_type;
using size_type = typename _Mylist::size_type;
using difference_type = typename _Mylist::difference_type;
using pointer = typename _Mylist::pointer;
using const_pointer = typename _Mylist::const_pointer;
using reference = value_type&;
using const_reference = const value_type&;
using iterator =
_STD conditional_t<_STD is_same_v<key_type, value_type>, typename _Mylist::const_iterator, typename _Mylist::iterator>;
using const_iterator = typename _Mylist::const_iterator;
using _Unchecked_iterator = _STD conditional_t<_STD is_same_v<key_type, value_type>,
typename _Mylist::_Unchecked_const_iterator, typename _Mylist::_Unchecked_iterator>;
using _Unchecked_const_iterator = typename _Mylist::_Unchecked_const_iterator;
using _Aliter = _STD _Rebind_alloc_t<_Alnode, _Unchecked_iterator>;
static constexpr size_type _Bucket_size = _Key_compare::bucket_size;
static constexpr size_type _Min_buckets = 8; // must be a positive power of 2
static constexpr bool _Multi = _Traits::_Multi;
template <class _TraitsT>
friend bool _Hash_equal(const _Hash<_TraitsT>& _Left, const _Hash<_TraitsT>& _Right);
protected:
_Hash(const _Key_compare& _Parg, const allocator_type& _Al)
: _Traitsobj(_Parg), _List(_Al), _Vec(_Al), _Mask(_Min_buckets - 1), _Maxidx(_Min_buckets) {
// construct empty hash table
_Max_bucket_size() = _Bucket_size;
_Vec._Assign_grow(_Min_buckets * 2, _List._Unchecked_end());
#ifdef _ENABLE_STL_INTERNAL_CHECK
_Stl_internal_check_container_invariants();
#endif // _ENABLE_STL_INTERNAL_CHECK
}
template <class _Any_alloc>
_Hash(const _Hash& _Right, const _Any_alloc& _Al)
: _Traitsobj(_Right._Traitsobj), _List(static_cast<allocator_type>(_Al)), _Vec(_Al), _Mask(_Right._Mask),
_Maxidx(_Right._Maxidx) {
// construct hash table by copying _Right
_Vec._Assign_grow(_Right._Vec.size(), _List._Unchecked_end());
_Insert_range_unchecked(_Right._Unchecked_begin(), _Right._Unchecked_end());
#ifdef _ENABLE_STL_INTERNAL_CHECK
_Stl_internal_check_container_invariants();
_Right._Stl_internal_check_container_invariants();
#endif // _ENABLE_STL_INTERNAL_CHECK
}
_Hash(_Hash&& _Right)
: _Traitsobj(_Right._Traitsobj), _List(_STD _Move_allocator_tag{}, _Right._List_Getal()),
_Vec(_STD move(_Right._Vec._Mypair._Get_first())) {
_Vec._Assign_grow(_Min_buckets * 2, _Unchecked_end());
_List._Swap_val(_Right._List);
_Vec._Mypair._Myval2._Swap_val(_Right._Vec._Mypair._Myval2);
_Mask = _STD exchange(_Right._Mask, _Min_buckets - 1);
_Maxidx = _STD exchange(_Right._Maxidx, _Min_buckets);
#ifdef _ENABLE_STL_INTERNAL_CHECK
_Stl_internal_check_container_invariants();
_Right._Stl_internal_check_container_invariants();
#endif // _ENABLE_STL_INTERNAL_CHECK
}
private:
void _Move_construct_equal_alloc(_Hash& _Right) {
_Vec._Assign_grow(_Min_buckets * 2, _Unchecked_end());
_List._Swap_val(_Right._List);
_Vec._Mypair._Myval2._Swap_val(_Right._Vec._Mypair._Myval2);
_Mask = _STD exchange(_Right._Mask, _Min_buckets - 1);
_Maxidx = _STD exchange(_Right._Maxidx, _Min_buckets);
}
public:
_Hash(_Hash&& _Right, const allocator_type& _Al) : _Traitsobj(_Right._Traitsobj), _List(_Al), _Vec(_Al) {
// construct hash table by moving _Right, allocator
if constexpr (_Alnode_traits::is_always_equal::value) {
_Move_construct_equal_alloc(_Right);
} else if (_List_Getal() == _Right._List_Getal()) {
_Move_construct_equal_alloc(_Right);
} else {
_Maxidx = _Min_buckets;
const auto _Myhead = _List_Mypair()._Myval2._Myhead;
for (auto& _Val : _Right._List) {
_List._Emplace(_Myhead, reinterpret_cast<_Mutable_value_type&&>(_Val));
}
_Reinsert_with_invalid_vec();
_Right.clear();
}
#ifdef _ENABLE_STL_INTERNAL_CHECK
_Stl_internal_check_container_invariants();
_Right._Stl_internal_check_container_invariants();
#endif // _ENABLE_STL_INTERNAL_CHECK
}
private:
void _Swap_val(_Hash& _Right) noexcept { // swap contents with equal allocator _Hash _Right
_List._Swap_val(_Right._List);
_Vec._Mypair._Myval2._Swap_val(_Right._Vec._Mypair._Myval2);
_STD swap(_Mask, _Right._Mask);
_STD swap(_Maxidx, _Right._Maxidx);
}
struct _Min_buckets_construct_ptr {
using pointer = typename _STD allocator_traits<_Aliter>::pointer;
_Aliter& _Al;
pointer _Base;
_Min_buckets_construct_ptr(_Aliter& _Al_) : _Al(_Al_), _Base(_Al.allocate(_Min_buckets * 2)) {}
_Min_buckets_construct_ptr(const _Min_buckets_construct_ptr&) = delete;
_NODISCARD pointer _Release(_Unchecked_iterator _Newend) noexcept {
_STD uninitialized_fill(_Base, _Base + _Min_buckets * 2, _Newend);
return _STD exchange(_Base, nullptr);
}
~_Min_buckets_construct_ptr() {
if (_Base) {
_Al.deallocate(_Base, _Min_buckets * 2);
}
}
};
void _Pocma_both(_Hash& _Right) {
_Pocma(_List_Getal(), _Right._List_Getal());
_Pocma(_Vec._Mypair._Get_first(), _Right._Vec._Mypair._Get_first());
}
struct _NODISCARD _Clear_guard {
_Hash* _Target;
explicit _Clear_guard(_Hash* const _Target_) : _Target(_Target_) {}
_Clear_guard(const _Clear_guard&) = delete;
_Clear_guard& operator=(const _Clear_guard&) = delete;
~_Clear_guard() {
if (_Target) {
_Target->clear();
}
}
};
#ifdef _ENABLE_STL_INTERNAL_CHECK
struct _NODISCARD _Check_container_invariants_guard {
const _Hash& _Target;
explicit _Check_container_invariants_guard(const _Hash& _Target_) : _Target(_Target_) {}
_Check_container_invariants_guard(const _Check_container_invariants_guard&) = delete;
_Check_container_invariants_guard& operator=(const _Check_container_invariants_guard&) = delete;
~_Check_container_invariants_guard() {
_Target._Stl_internal_check_container_invariants();
}
};
#endif // _ENABLE_STL_INTERNAL_CHECK
public:
_Hash& operator=(_Hash&& _Right) { // assign by moving _Right
if (this == _STD addressof(_Right)) {
return *this;
}
#ifdef _ENABLE_STL_INTERNAL_CHECK
_Check_container_invariants_guard _Check_self{*this};
_Check_container_invariants_guard _Check_right{_Right};
#endif // _ENABLE_STL_INTERNAL_CHECK
auto& _Al = _Getal();
auto& _Right_al = _Right._Getal();
constexpr auto _Pocma_val = _STD _Choose_pocma_v<_Alnode>;
if constexpr (_Pocma_val == _STD _Pocma_values::_Propagate_allocators) {
if (_Al != _Right_al) {
// allocate all the parts necessary to maintain _Hash invariants using _Right's allocator
auto&& _Alproxy = _GET_PROXY_ALLOCATOR(_Alnode, _Al);
auto&& _Right_alproxy = _GET_PROXY_ALLOCATOR(_Alnode, _Right_al);
_STD _Container_proxy_ptr<_Alnode> _List_proxy(_Right_alproxy, _STD _Leave_proxy_unbound{});
_STD _Container_proxy_ptr<_Alnode> _Vec_proxy(_Right_alproxy, _STD _Leave_proxy_unbound{});
_STD _List_head_construct_ptr<_Alnode> _Newhead(_Right_al);
_Min_buckets_construct_ptr _Buckets(_Right._Vec._Mypair._Get_first());
// assign the hash/compare ops; we have no control over whether this throws, and if it does we want
// to do nothing
_Traitsobj = _Right._Traitsobj;
// nothrow hereafter
// release any state we are currently owning, and propagate the allocators
_List._Tidy();
_Vec._Tidy();
_Pocma_both(_Right);
// assign the empty list to _Right._List (except the allocators), and take _Right's _List data
auto& _List_data = _List_Mypair()._Myval2;
auto& _Right_list_data = _Right._List_Mypair()._Myval2;
_List_data._Myhead = _STD exchange(_Right_list_data._Myhead, _Newhead._Release());
_List_data._Mysize = _STD exchange(_Right_list_data._Mysize, size_type{0});
_List_proxy._Bind(_Alproxy, _STD addressof(_List_data));
_List_data._Swap_proxy_and_iterators(_Right_list_data);
// assign the _Min_buckets into _Right's _Vec data and take _Right's _Vec data
auto& _Vec_data = _Vec._Mypair._Myval2;
auto& _Right_vec_data = _Right._Vec._Mypair._Myval2;
const auto _Newfirst = _Buckets._Release(_Right._Unchecked_end());
const auto _Newlast = _Newfirst + _Min_buckets * 2;
_Vec_data._Myfirst = _STD exchange(_Right_vec_data._Myfirst, _Newfirst);
_Vec_data._Mylast = _STD exchange(_Right_vec_data._Mylast, _Newlast);
_Vec_data._Myend = _STD exchange(_Right_vec_data._Myend, _Newlast);
_Vec_proxy._Bind(_Alproxy, _STD addressof(_Vec_data));
_Vec_data._Swap_proxy_and_iterators(_Right_vec_data);
// give _Right the default _Mask and _Maxidx values and take its former values
_Mask = _STD exchange(_Right._Mask, _Min_buckets - 1);
_Maxidx = _STD exchange(_Right._Maxidx, _Min_buckets);
return *this;
}
} else if constexpr (_Pocma_val == _STD _Pocma_values::_No_propagate_allocators) {
if (_Al != _Right_al) {
_Clear_guard _Guard{this};
_Traitsobj = _Right._Traitsobj;
using _Adapter = _STD _Reinterpret_move_iter<typename _Mylist::_Unchecked_iterator, _Mutable_value_type>;
_List.template _Assign_cast<_Mutable_value_type&>(
_Adapter{_Right._List._Unchecked_begin()}, _Adapter{_Right._List._Unchecked_end()});
_Reinsert_with_invalid_vec();
_Guard._Target = nullptr;
return *this;
}
}
clear();
_Traitsobj = _Right._Traitsobj;
_Pocma_both(_Right);
_Swap_val(_Right);
return *this;
}
template <class... _Valtys>
_STD conditional_t<_Multi, iterator, _STD pair<iterator, bool>> emplace(_Valtys&&... _Vals) {
// try to insert value_type(_Vals...)
using _In_place_key_extractor = typename _Traits::template _In_place_key_extractor<_STD _Remove_cvref_t<_Valtys>...>;
if constexpr (_Multi) {
_Check_max_size();
_STD _List_node_emplace_op2<_Alnode> _Newnode(_List_Getal(), _STD forward<_Valtys>(_Vals)...);
const auto& _Keyval = _Traits::_Kfn(_Newnode._Ptr->_Myval);
const auto _Hashval = _Traitsobj(_Keyval);
if (_Check_rehash_required_1()) {
_Rehash_for_1();
}
const auto _Target = _Find_last(_Keyval, _Hashval);
return _List._Make_iter(_Insert_new_node_before(_Hashval, _Target._Insert_before, _Newnode._Release()));
} else if constexpr (_In_place_key_extractor::_Extractable) {
const auto& _Keyval = _In_place_key_extractor::_Extract(_Vals...);
const auto _Hashval = _Traitsobj(_Keyval);
auto _Target = _Find_last(_Keyval, _Hashval);
if (_Target._Duplicate) {
return {_List._Make_iter(_Target._Duplicate), false};
}
_Check_max_size();
// invalidates _Keyval:
_STD _List_node_emplace_op2<_Alnode> _Newnode(_List_Getal(), _STD forward<_Valtys>(_Vals)...);
if (_Check_rehash_required_1()) {
_Rehash_for_1();
_Target = _Find_last(_Traits::_Kfn(_Newnode._Ptr->_Myval), _Hashval);
}
return {
_List._Make_iter(_Insert_new_node_before(_Hashval, _Target._Insert_before, _Newnode._Release())), true};
} else {
_STD _List_node_emplace_op2<_Alnode> _Newnode(_List_Getal(), _STD forward<_Valtys>(_Vals)...);
const auto& _Keyval = _Traits::_Kfn(_Newnode._Ptr->_Myval);
const auto _Hashval = _Traitsobj(_Keyval);
auto _Target = _Find_last(_Keyval, _Hashval);
if (_Target._Duplicate) {
return {_List._Make_iter(_Target._Duplicate), false};
}
_Check_max_size();
if (_Check_rehash_required_1()) {
_Rehash_for_1();
_Target = _Find_last(_Traits::_Kfn(_Newnode._Ptr->_Myval), _Hashval);
}
return {
_List._Make_iter(_Insert_new_node_before(_Hashval, _Target._Insert_before, _Newnode._Release())), true};
}
}
template <class... _Valtys>
iterator emplace_hint(const_iterator _Hint, _Valtys&&... _Vals) { // try to insert value_type(_Vals...)
using _In_place_key_extractor = typename _Traits::template _In_place_key_extractor<_STD _Remove_cvref_t<_Valtys>...>;
if constexpr (_Multi) {
_Check_max_size();
_STD _List_node_emplace_op2<_Alnode> _Newnode(_List_Getal(), _STD forward<_Valtys>(_Vals)...);
const auto& _Keyval = _Traits::_Kfn(_Newnode._Ptr->_Myval);
const auto _Hashval = _Traitsobj(_Keyval);
if (_Check_rehash_required_1()) {
_Rehash_for_1();
}
const auto _Target = _Find_hint(_Hint._Ptr, _Keyval, _Hashval);
return _List._Make_iter(_Insert_new_node_before(_Hashval, _Target._Insert_before, _Newnode._Release()));
} else if constexpr (_In_place_key_extractor::_Extractable) {
const auto& _Keyval = _In_place_key_extractor::_Extract(_Vals...);
const auto _Hashval = _Traitsobj(_Keyval);
auto _Target = _Find_hint(_Hint._Ptr, _Keyval, _Hashval);
if (_Target._Duplicate) {
return _List._Make_iter(_Target._Duplicate);
}
_Check_max_size();
// invalidates _Keyval:
_STD _List_node_emplace_op2<_Alnode> _Newnode(_List_Getal(), _STD forward<_Valtys>(_Vals)...);
if (_Check_rehash_required_1()) {
_Rehash_for_1();
_Target = _Find_hint(_Hint._Ptr, _Traits::_Kfn(_Newnode._Ptr->_Myval), _Hashval);
}
return _List._Make_iter(_Insert_new_node_before(_Hashval, _Target._Insert_before, _Newnode._Release()));
} else {
_STD _List_node_emplace_op2<_Alnode> _Newnode(_List_Getal(), _STD forward<_Valtys>(_Vals)...);
const auto& _Keyval = _Traits::_Kfn(_Newnode._Ptr->_Myval);
const auto _Hashval = _Traitsobj(_Keyval);
auto _Target = _Find_hint(_Hint._Ptr, _Keyval, _Hashval);
if (_Target._Duplicate) {
return _List._Make_iter(_Target._Duplicate);
}
_Check_max_size();
if (_Check_rehash_required_1()) {
_Rehash_for_1();
_Target = _Find_hint(_Hint._Ptr, _Traits::_Kfn(_Newnode._Ptr->_Myval), _Hashval);
}
return _List._Make_iter(_Insert_new_node_before(_Hashval, _Target._Insert_before, _Newnode._Release()));
}
}
protected:
template <class _Keyty, class... _Mappedty>
_STD pair<_Nodeptr, bool> _Try_emplace(_Keyty&& _Keyval_arg, _Mappedty&&... _Mapval) {
const auto& _Keyval = _Keyval_arg;
const auto _Hashval = _Traitsobj(_Keyval);
auto _Target = _Find_last(_Keyval, _Hashval);
if (_Target._Duplicate) {
return {_Target._Duplicate, false};
}
_Check_max_size();
_STD _List_node_emplace_op2<_Alnode> _Newnode(_List_Getal(), _STD piecewise_construct,
_STD forward_as_tuple(_STD forward<_Keyty>(_Keyval_arg)),
_STD forward_as_tuple(_STD forward<_Mappedty>(_Mapval)...));
if (_Check_rehash_required_1()) {
_Rehash_for_1();
_Target = _Find_last(_Traits::_Kfn(_Newnode._Ptr->_Myval), _Hashval);
}
return {_Insert_new_node_before(_Hashval, _Target._Insert_before, _Newnode._Release()), true};
}
template <class _Keyty, class... _Mappedty>
_Nodeptr _Try_emplace_hint(const _Nodeptr _Hint, _Keyty&& _Keyval_arg, _Mappedty&&... _Mapval) {
const auto& _Keyval = _Keyval_arg;
const auto _Hashval = _Traitsobj(_Keyval);
auto _Target = _Find_hint(_Hint, _Keyval, _Hashval);
if (_Target._Duplicate) {
return _Target._Duplicate;
}
_Check_max_size();
// might invalidate _Keyval:
_STD _List_node_emplace_op2<_Alnode> _Newnode(_List_Getal(), _STD piecewise_construct,
_STD forward_as_tuple(_STD forward<_Keyty>(_Keyval_arg)),
_STD forward_as_tuple(_STD forward<_Mappedty>(_Mapval)...));
if (_Check_rehash_required_1()) {
_Rehash_for_1();
_Target = _Find_hint(_Hint, _Traits::_Kfn(_Newnode._Ptr->_Myval), _Hashval);
}
return _Insert_new_node_before(_Hashval, _Target._Insert_before, _Newnode._Release());
}
private:
void _Pocca_both(const _Hash& _Right) {
_Pocca(_List_Getal(), _Right._List_Getal());
_Pocca(_Vec._Mypair._Get_first(), _Right._Vec._Mypair._Get_first());
}
public:
_Hash& operator=(const _Hash& _Right) {
if (this == _STD addressof(_Right)) {
return *this;
}
#ifdef _ENABLE_STL_INTERNAL_CHECK
_Check_container_invariants_guard _Check_self{*this};
_Check_container_invariants_guard _Check_right{_Right};
#endif // _ENABLE_STL_INTERNAL_CHECK
if constexpr (_STD _Choose_pocca_v<_Alnode>) {
auto& _Al = _Getal();
const auto& _Right_al = _Right._Getal();
if (_Al != _Right_al) {
auto&& _Alproxy = _GET_PROXY_ALLOCATOR(_Alnode, _Al);
auto&& _Right_alproxy = _GET_PROXY_ALLOCATOR(_Alnode, _Right_al);
_STD _Container_proxy_ptr<_Alnode> _Vec_proxy(_Right_alproxy, _STD _Leave_proxy_unbound{});
_List._Reload_sentinel_and_proxy(_Right._List);
_Vec._Tidy();
_Pocca_both(_Right);
_Vec_proxy._Bind(_Alproxy, _STD addressof(_Vec._Mypair._Myval2));
_Clear_guard _Guard{this};
_Traitsobj = _Right._Traitsobj;
_List.template _Assign_cast<_Mutable_value_type&>(
_Right._List._Unchecked_begin(), _Right._List._Unchecked_end());
_Reinsert_with_invalid_vec();
_Guard._Target = nullptr;
return *this;
}
}
_Clear_guard _Guard{this};
_Traitsobj = _Right._Traitsobj;
_Pocca_both(_Right);
_List.template _Assign_cast<_Mutable_value_type&>(
_Right._List._Unchecked_begin(), _Right._List._Unchecked_end());
_Reinsert_with_invalid_vec();
_Guard._Target = nullptr;
return *this;
}
_NODISCARD iterator begin() noexcept {
return _List.begin();
}
_NODISCARD const_iterator begin() const noexcept {
return _List.begin();
}
_NODISCARD iterator end() noexcept {
return _List.end();
}
_NODISCARD const_iterator end() const noexcept {
return _List.end();
}
_Unchecked_iterator _Unchecked_begin() noexcept {
return _List._Unchecked_begin();
}
_Unchecked_const_iterator _Unchecked_begin() const noexcept {
return _List._Unchecked_begin();
}
_Unchecked_iterator _Unchecked_end() noexcept {
return _List._Unchecked_end();
}
_Unchecked_const_iterator _Unchecked_end() const noexcept {
return _List._Unchecked_end();
}
_NODISCARD const_iterator cbegin() const noexcept {
return begin();
}
_NODISCARD const_iterator cend() const noexcept {
return end();
}
_NODISCARD size_type size() const noexcept {
return _List.size();
}
_NODISCARD size_type max_size() const noexcept {
return _List.max_size();
}
_NODISCARD_EMPTY_MEMBER bool empty() const noexcept {
return _List.empty();
}
_NODISCARD allocator_type get_allocator() const noexcept {
return static_cast<allocator_type>(_List.get_allocator());
}
using local_iterator = iterator;
using const_local_iterator = const_iterator;
_NODISCARD size_type bucket_count() const noexcept {
return _Maxidx;
}
_NODISCARD size_type max_bucket_count() const noexcept {
return _Vec.max_size() >> 1;
}
_NODISCARD size_type bucket(const key_type& _Keyval) const
noexcept(_STD _Nothrow_hash<_Traits, key_type>) /* strengthened */ {
return _Traitsobj(_Keyval) & _Mask;
}
_NODISCARD size_type bucket_size(size_type _Bucket) const noexcept /* strengthened */ {
_Unchecked_iterator _Bucket_lo = _Vec._Mypair._Myval2._Myfirst[_Bucket << 1];
if (_Bucket_lo == _Unchecked_end()) {
return 0;
}
return static_cast<size_type>(_STD distance(_Bucket_lo, _Vec._Mypair._Myval2._Myfirst[(_Bucket << 1) + 1])) + 1;
}
_NODISCARD local_iterator begin(size_type _Bucket) noexcept /* strengthened */ {
return _List._Make_iter(_Vec._Mypair._Myval2._Myfirst[_Bucket << 1]._Ptr);
}
_NODISCARD const_local_iterator begin(size_type _Bucket) const noexcept /* strengthened */ {
return _List._Make_const_iter(_Vec._Mypair._Myval2._Myfirst[_Bucket << 1]._Ptr);
}
_NODISCARD local_iterator end(size_type _Bucket) noexcept /* strengthened */ {
_Nodeptr _Bucket_hi = _Vec._Mypair._Myval2._Myfirst[(_Bucket << 1) + 1]._Ptr;
if (_Bucket_hi != _List_Mypair()._Myval2._Myhead) {
_Bucket_hi = _Bucket_hi->_Next;
}
return _List._Make_iter(_Bucket_hi);
}
_NODISCARD const_local_iterator end(size_type _Bucket) const noexcept /* strengthened */ {
_Nodeptr _Bucket_hi = _Vec._Mypair._Myval2._Myfirst[(_Bucket << 1) + 1]._Ptr;
if (_Bucket_hi != _List_Mypair()._Myval2._Myhead) {
_Bucket_hi = _Bucket_hi->_Next;
}
return _List._Make_const_iter(_Bucket_hi);
}
_NODISCARD const_local_iterator cbegin(size_type _Bucket) const noexcept /* strengthened */ {
return _List._Make_const_iter(_Vec._Mypair._Myval2._Myfirst[_Bucket << 1]._Ptr);
}
_NODISCARD const_local_iterator cend(size_type _Bucket) const noexcept /* strengthened */ {
_Nodeptr _Bucket_hi = _Vec._Mypair._Myval2._Myfirst[(_Bucket << 1) + 1]._Ptr;
if (_Bucket_hi != _List_Mypair()._Myval2._Myhead) {
_Bucket_hi = _Bucket_hi->_Next;
}
return _List._Make_const_iter(_Bucket_hi);
}
_NODISCARD float load_factor() const noexcept {
return static_cast<float>(size()) / static_cast<float>(bucket_count());
}
_NODISCARD float max_load_factor() const noexcept {
return _Max_bucket_size();
}
void max_load_factor(float _Newmax) noexcept /* strengthened */ {
_STL_ASSERT(!(_CSTD isnan)(_Newmax) && _Newmax > 0, "invalid hash load factor");
_Max_bucket_size() = _Newmax;
}
void rehash(size_type _Buckets) { // rebuild table with at least _Buckets buckets
// don't violate a.bucket_count() >= a.size() / a.max_load_factor() invariant:
_Buckets = (_STD max)(_Min_load_factor_buckets(_List.size()), _Buckets);
if (_Buckets <= _Maxidx) { // we already have enough buckets; nothing to do
return;
}
_Forced_rehash(_Buckets);
}
void reserve(size_type _Maxcount) { // rebuild table with room for _Maxcount elements
rehash(_Min_load_factor_buckets(_Maxcount));
}
_STD conditional_t<_Multi, iterator, _STD pair<iterator, bool>> insert(const value_type& _Val) {
return emplace(_Val);
}
_STD conditional_t<_Multi, iterator, _STD pair<iterator, bool>> insert(value_type&& _Val) {
return emplace(_STD move(_Val));
}
iterator insert(const_iterator _Hint, const value_type& _Val) {
return emplace_hint(_Hint, _Val);
}
iterator insert(const_iterator _Hint, value_type&& _Val) {
return emplace_hint(_Hint, _STD move(_Val));
}
protected:
template <class _Iter, class _Sent>
void _Insert_range_unchecked(_Iter _First, const _Sent _Last) {
for (; _First != _Last; ++_First) {
emplace(*_First);
}
}
public:
template <class _Iter>
void insert(_Iter _First, _Iter _Last) {
_STD _Adl_verify_range(_First, _Last);
_Insert_range_unchecked(_Get_unwrapped(_First), _Get_unwrapped(_Last));
}
#if _HAS_CXX23 && defined(__cpp_lib_concepts) // TRANSITION, GH-395
template <_STD _Container_compatible_range<value_type> _Rng>
void insert_range(_Rng&& _Range) {
_Insert_range_unchecked(_RANGES _Ubegin(_Range), _RANGES _Uend(_Range));
}
#endif // _HAS_CXX23 && defined(__cpp_lib_concepts)
void insert(_STD initializer_list<value_type> _Ilist) {
_Insert_range_unchecked(_Ilist.begin(), _Ilist.end());
}
private:
_Nodeptr _Unchecked_erase(_Nodeptr _Plist) noexcept(_STD _Nothrow_hash<_Traits, key_type>) {
size_type _Bucket = bucket(_Traits::_Kfn(_Plist->_Myval));
_Erase_bucket(_Plist, _Bucket);
return _List._Unchecked_erase(_Plist);
}
struct _Range_eraser {
_Range_eraser(const _Range_eraser&) = delete;
_Range_eraser& operator=(const _Range_eraser&) = delete;
#if _ITERATOR_DEBUG_LEVEL == 2
// Keep the list nodes around until we have found all those we will erase, for an O(iterators + erasures) update
// of the iterator chain.
_Range_eraser(_Mylist& _List_, const _Nodeptr _First_) noexcept
: _List(_List_), _First(_First_), _Next(_First_) {}
void _Bump_erased() noexcept {
_Next = _Next->_Next;
}
~_Range_eraser() noexcept {
_List._Unchecked_erase(_First, _Next);
}
_Mylist& _List;
const _Nodeptr _First;
_Nodeptr _Next;
#else // ^^^ _ITERATOR_DEBUG_LEVEL == 2 / _ITERATOR_DEBUG_LEVEL != 2 vvv
// Destroy the nodes as we encounter them to avoid a second traversal of the linked list.
_Range_eraser(_Mylist& _List_, const _Nodeptr _First_) noexcept
: _List(_List_), _Predecessor(_First_->_Prev), _Next(_First_) {}
void _Bump_erased() noexcept {
const auto _Oldnext = _Next;
_Next = _Oldnext->_Next;
_Node::_Freenode(_MylistImpl::_List_Getal(_List), _Oldnext);
--_MylistImpl::_List_Mypair(_List)._Myval2._Mysize;
}
~_Range_eraser() noexcept {
_Predecessor->_Next = _Next;
_Next->_Prev = _Predecessor;
}
_Mylist& _List;
const _Nodeptr _Predecessor;
_Nodeptr _Next;
#endif
};
_Nodeptr _Unchecked_erase(_Nodeptr _First, const _Nodeptr _Last) noexcept(_STD _Nothrow_hash<_Traits, key_type>) {
if (_First == _Last) {
return _Last;
}
const auto _End = _List_Mypair()._Myval2._Myhead;
const auto _Bucket_bounds = _Vec._Mypair._Myval2._Myfirst;
_Range_eraser _Eraser{_List, _First};
{
// process the first bucket, which is special because here _First might not be the beginning of the bucket
const auto _Predecessor = _First->_Prev;
const size_type _Bucket = bucket(_Traits::_Kfn(_Eraser._Next->_Myval)); // throws
// nothrow hereafter this block
_Nodeptr& _Bucket_lo = _Bucket_bounds[_Bucket << 1]._Ptr;
_Nodeptr& _Bucket_hi = _Bucket_bounds[(_Bucket << 1) + 1]._Ptr;
const bool _Update_lo = _Bucket_lo == _Eraser._Next;
const _Nodeptr _Old_hi = _Bucket_hi;
for (;;) { // remove elements until we hit the end of the bucket
const bool _At_bucket_back = _Eraser._Next == _Old_hi;
_Eraser._Bump_erased();
if (_At_bucket_back) {
break;
}
if (_Eraser._Next == _Last) {
if (_Update_lo) {
// erased the bucket's prefix
_Bucket_lo = _Eraser._Next;
}
return _Last;
}
}
if (_Update_lo) {
// emptied the bucket
_Bucket_lo = _End;
_Bucket_hi = _End;
} else {
_Bucket_hi = _Predecessor;
}
}
// hereafter we are always erasing buckets' prefixes
while (_Eraser._Next != _Last) {
const size_type _Bucket = bucket(_Traits::_Kfn(_Eraser._Next->_Myval)); // throws
// nothrow hereafter this block
_Nodeptr& _Bucket_lo = _Bucket_bounds[_Bucket << 1]._Ptr;
_Nodeptr& _Bucket_hi = _Bucket_bounds[(_Bucket << 1) + 1]._Ptr;
const _Nodeptr _Old_hi = _Bucket_hi;
for (;;) { // remove elements until we hit the end of the bucket
const bool _At_bucket_back = _Eraser._Next == _Old_hi;
_Eraser._Bump_erased();
if (_At_bucket_back) {
break;
}
if (_Eraser._Next == _Last) {
// erased the bucket's prefix
_Bucket_lo = _Eraser._Next;
return _Last;
}
}
// emptied the bucket
_Bucket_lo = _End;
_Bucket_hi = _End;
}
return _Last;
}
template <class _Kx>
static constexpr bool _Noexcept_heterogeneous_erasure() {
return _STD _Nothrow_hash<_Traits, _Kx>
&& (!_Multi || (_STD _Nothrow_compare<_Traits, key_type, _Kx> && _STD _Nothrow_compare<_Traits, _Kx, key_type>) );
}
template <class _Keytype>
size_type _Erase(const _Keytype& _Keyval) noexcept(_Noexcept_heterogeneous_erasure<_Keytype>()) /* strengthened */ {
const size_t _Hashval = _Traitsobj(_Keyval);
if constexpr (_Multi) {
const auto _Where = _Equal_range(_Keyval, _Hashval);
_Unchecked_erase(_Where._First._Ptr, _Where._Last._Ptr);
return _Where._Distance;
} else {
const auto _Target = _Find_last(_Keyval, _Hashval)._Duplicate;
if (_Target) {
_Erase_bucket(_Target, _Hashval & _Mask);
_List._Unchecked_erase(_Target);
return 1;
}
return 0;
}
}
public:
template <class _Iter = iterator, _STD enable_if_t<!_STD is_same_v<_Iter, const_iterator>, int> = 0>
iterator erase(iterator _Plist) noexcept(_STD _Nothrow_hash<_Traits, key_type>) /* strengthened */ {
return _List._Make_iter(_Unchecked_erase(_Plist._Ptr));
}
iterator erase(const_iterator _Plist) noexcept(_STD _Nothrow_hash<_Traits, key_type>) /* strengthened */ {
return _List._Make_iter(_Unchecked_erase(_Plist._Ptr));
}
iterator erase(const_iterator _First, const_iterator _Last) noexcept(
_STD _Nothrow_hash<_Traits, key_type>) /* strengthened */ {
return _List._Make_iter(_Unchecked_erase(_First._Ptr, _Last._Ptr));
}
size_type erase(const key_type& _Keyval) noexcept(noexcept(_Erase(_Keyval))) /* strengthened */ {
return _Erase(_Keyval);
}
#if _HAS_CXX23
template <class _Kx, class _Mytraits = _Traits,
_STD enable_if_t<_Mytraits::template _Supports_transparency<_Hash, _Kx>, int> = 0>
size_type erase(_Kx&& _Keyval) noexcept(noexcept(_Erase(_Keyval))) /* strengthened */ {
return _Erase(_Keyval);
}
#endif // _HAS_CXX23
void clear() noexcept {
// TRANSITION, ABI:
// LWG-2550 requires implementations to make clear() O(size()), independent of bucket_count().
// Unfortunately our current data structure / ABI does not allow achieving this in the general case because:
// (1) Finding the bucket that goes with an element requires running the hash function
// (2) The hash function operator() may throw exceptions, and
// (3) clear() is a noexcept function.
// We do comply with LWG-2550 if the hash function is noexcept, or if the container was empty.
const auto _Oldsize = _List_Mypair()._Myval2._Mysize;
if (_Oldsize == 0) {
return;
}
if constexpr (_STD _Nothrow_hash<_Traits, key_type>) {
// In testing, hash<size_t>{}(size_t{}) takes about 14 times as much time as assigning a pointer, or
// ~7-8 times as much as clearing a bucket. Therefore, if we would need to assign over more than 8 times
// as many buckets as elements, remove element-by-element.
if (bucket_count() / 8 > _Oldsize) {
const auto _Head = _List_Mypair()._Myval2._Myhead;
_Unchecked_erase(_Head->_Next, _Head);
return;
}
}
// Bulk destroy items and reset buckets
_List.clear();
_STD fill(_Vec._Mypair._Myval2._Myfirst, _Vec._Mypair._Myval2._Mylast, _Unchecked_end());
}
private:
template <class _Keyty>
_NODISCARD _Nodeptr _Find_first(const _Keyty& _Keyval, const size_t _Hashval) const {
// find node pointer to first node matching _Keyval (with hash _Hashval) if it exists; otherwise, end
const size_type _Bucket = _Hashval & _Mask;
_Nodeptr _Where = _Vec._Mypair._Myval2._Myfirst[_Bucket << 1]._Ptr;
const _Nodeptr _End = _List_Mypair()._Myval2._Myhead;
if (_Where == _End) {
return _End;
}
const _Nodeptr _Bucket_hi = _Vec._Mypair._Myval2._Myfirst[(_Bucket << 1) + 1]._Ptr;
for (;;) {
if (!_Traitsobj(_Traits::_Kfn(_Where->_Myval), _Keyval)) {
if constexpr (!_Traits::_Standard) {
if (_Traitsobj(_Keyval, _Traits::_Kfn(_Where->_Myval))) {
return _End;
}
}
return _Where;
}
if (_Where == _Bucket_hi) {
return _End;
}
_Where = _Where->_Next;
}
}
template <class _Keyty>
_Nodeptr _Find(const _Keyty& _Keyval, const size_t _Hashval) const {
if constexpr (_Traits::_Multi) {
return _Find_first(_Keyval, _Hashval);
} else {
// use _Find_last for unique containers to avoid increase in code size of instantiating _Find_first
auto _Target = _Find_last(_Keyval, _Hashval)._Duplicate;
if (_Target) {
return _Target;
}
return _List_Mypair()._Myval2._Myhead;
}
}
public:
template <class _Keyty = void>
_NODISCARD iterator find(typename _Traits::template _Deduce_key<_Keyty> _Keyval) {
return _List._Make_iter(_Find(_Keyval, _Traitsobj(_Keyval)));
}
template <class _Keyty = void>
_NODISCARD const_iterator find(typename _Traits::template _Deduce_key<_Keyty> _Keyval) const {
return _List._Make_const_iter(_Find(_Keyval, _Traitsobj(_Keyval)));
}
#if _HAS_CXX20
template <class _Keyty = void>
_NODISCARD bool contains(_Traits::template _Deduce_key<_Keyty> _Keyval) const {
return static_cast<bool>(_Find_last(_Keyval, _Traitsobj(_Keyval))._Duplicate);
}
#endif // _HAS_CXX20
template <class _Keyty = void>
_NODISCARD size_type count(typename _Traits::template _Deduce_key<_Keyty> _Keyval) const {
const size_t _Hashval = _Traitsobj(_Keyval);
if constexpr (_Multi) {
return _Equal_range(_Keyval, _Hashval)._Distance;
} else {
return static_cast<bool>(_Find_last(_Keyval, _Hashval)._Duplicate);
}
}
_DEPRECATE_STDEXT_HASH_LOWER_BOUND _NODISCARD iterator lower_bound(const key_type& _Keyval) {
return _List._Make_iter(_Find(_Keyval, _Traitsobj(_Keyval)));
}
_DEPRECATE_STDEXT_HASH_LOWER_BOUND _NODISCARD const_iterator lower_bound(const key_type& _Keyval) const {
return _List._Make_const_iter(_Find(_Keyval, _Traitsobj(_Keyval)));
}
_DEPRECATE_STDEXT_HASH_UPPER_BOUND _NODISCARD iterator upper_bound(const key_type& _Keyval) {
auto _Target = _Find_last(_Keyval, _Traitsobj(_Keyval))._Duplicate;
if (_Target) {
_Target = _Target->_Next;
} else {
_Target = _List_Mypair()._Myval2._Myhead;
}
return _List._Make_iter(_Target);
}
_DEPRECATE_STDEXT_HASH_UPPER_BOUND _NODISCARD const_iterator upper_bound(const key_type& _Keyval) const {
auto _Target = _Find_last(_Keyval, _Traitsobj(_Keyval))._Duplicate;
if (_Target) {
_Target = _Target->_Next;
} else {
_Target = _List_Mypair()._Myval2._Myhead;
}
return _List._Make_const_iter(_Target);
}
private:
struct _Equal_range_result {
_Unchecked_const_iterator _First;
_Unchecked_const_iterator _Last;
size_type _Distance;
};
template <class _Keyty>
_NODISCARD _Equal_range_result _Equal_range(const _Keyty& _Keyval, const size_t _Hashval) const
noexcept(_STD _Nothrow_compare<_Traits, key_type, _Keyty>&& _STD _Nothrow_compare<_Traits, _Keyty, key_type>) {
const size_type _Bucket = _Hashval & _Mask;
_Unchecked_const_iterator _Where = _Vec._Mypair._Myval2._Myfirst[_Bucket << 1];
const _Unchecked_const_iterator _End = _Unchecked_end();
if (_Where == _End) {
return {_End, _End, 0};
}
const _Unchecked_const_iterator _Bucket_hi = _Vec._Mypair._Myval2._Myfirst[(_Bucket << 1) + 1];
for (; _Traitsobj(_Traits::_Kfn(*_Where), _Keyval); ++_Where) {
if (_Where == _Bucket_hi) {
return {_End, _End, 0};
}
}
if constexpr (!_Traits::_Standard) {
if (_Traitsobj(_Keyval, _Traits::_Kfn(*_Where))) {
return {_End, _End, 0};
}
}
const _Unchecked_const_iterator _First = _Where;
if constexpr (_Multi) {
size_type _Distance = 0;
for (;;) {
++_Distance;
const bool _At_bucket_end = _Where == _Bucket_hi;
++_Where;
if (_At_bucket_end) {
break;
}
if (_Traitsobj(_Keyval, _Traits::_Kfn(*_Where))) {
break;
}
}
return {_First, _Where, _Distance};
} else {
++_Where; // found the unique element
return {_First, _Where, 1};
}
}
public:
template <class _Keyty = void>
_NODISCARD _STD pair<iterator, iterator> equal_range(typename _Traits::template _Deduce_key<_Keyty> _Keyval) {
const auto _Result = _Equal_range(_Keyval, _Traitsobj(_Keyval));
return {_List._Make_iter(_Result._First._Ptr), _List._Make_iter(_Result._Last._Ptr)};
}
template <class _Keyty = void>
_NODISCARD _STD pair<const_iterator, const_iterator> equal_range(
typename _Traits::template _Deduce_key<_Keyty> _Keyval) const {
const auto _Result = _Equal_range(_Keyval, _Traitsobj(_Keyval));
return {_List._Make_const_iter(_Result._First._Ptr), _List._Make_const_iter(_Result._Last._Ptr)};
}
void swap(_Hash& _Right) noexcept(noexcept(_Traitsobj.swap(_Right._Traitsobj))) /* strengthened */ {
if (this != _STD addressof(_Right)) {
_Traitsobj.swap(_Right._Traitsobj);
_Pocs(_List_Getal(), _Right._List_Getal());
_Pocs(_Vec._Mypair._Get_first(), _Right._Vec._Mypair._Get_first());
_Swap_val(_Right);
}
}
#if _HAS_CXX17
using node_type = typename _Traits::node_type;
node_type extract(const const_iterator _Where) {
#if _ITERATOR_DEBUG_LEVEL == 2
const auto _List_data = _STD addressof(_List_Mypair()._Myval2);
_STL_VERIFY(_Where._Getcont() == _List_data, "extract mismatched container");
_STL_VERIFY(_Where._Ptr != _List_data->_Myhead, "cannot extract end()");
#endif // _ITERATOR_DEBUG_LEVEL == 2
return node_type::_Make(_Extract(_Where._Unwrapped()), _List_Getal());
}
node_type extract(const key_type& _Keyval) {
const auto _Ptr = _Extract(_Keyval);
if (!_Ptr) {
return node_type{};
}
return node_type::_Make(_Ptr, _List_Getal());
}
#if _HAS_CXX23
template <class _Kx, class _Mytraits = _Traits,
_STD enable_if_t<_Mytraits::template _Supports_transparency<_Hash, _Kx>, int> = 0>
node_type extract(_Kx&& _Keyval) {
const auto _Ptr = _Extract(_Keyval);
if (!_Ptr) {
return node_type{};
}
return node_type::_Make(_Ptr, _List_Getal());
}
#endif // _HAS_CXX23
iterator insert(const_iterator _Hint, node_type&& _Handle) {
if (_Handle.empty()) {
return end();
}
#if _ITERATOR_DEBUG_LEVEL == 2
_STL_VERIFY(_List.get_allocator() == _Handle._Getal(), "node handle allocator incompatible for insert");
#endif // _ITERATOR_DEBUG_LEVEL == 2
const auto& _Keyval = _Traits::_Kfn(_Handle._Getptr()->_Myval);
const size_t _Hashval = _Traitsobj(_Keyval);
auto _Target = _Find_hint(_Hint._Ptr, _Keyval, _Hashval);
if constexpr (!_Traits::_Multi) {
if (_Target._Duplicate) {
return _List._Make_iter(_Target._Duplicate);
}
}
_Check_max_size();
if (_Check_rehash_required_1()) {
_Rehash_for_1();
_Target = _Find_hint(_Hint._Ptr, _Keyval, _Hashval);
}
const auto _Released = _Handle._Release();
_Destroy_in_place(_Released->_Next); // TRANSITION, ABI
_Destroy_in_place(_Released->_Prev);
return _List._Make_iter(_Insert_new_node_before(_Hashval, _Target._Insert_before, _Released));
}
template <class>
friend class _Hash;
template <class _Other_traits>
void merge(_Hash<_Other_traits>& _That) { // transfer all nodes from _That into *this
static_assert(_STD is_same_v<_Nodeptr, typename _Hash<_Other_traits>::_Nodeptr>,
"merge() requires an argument with a compatible node type.");
static_assert(_STD is_same_v<allocator_type, typename _Hash<_Other_traits>::allocator_type>,
"merge() requires an argument with the same allocator type.");
if constexpr (_STD is_same_v<_Hash, _Hash<_Other_traits>>) {
if (this == _STD addressof(_That)) {
return;
}
}
#if _ITERATOR_DEBUG_LEVEL == 2
if constexpr (!_Alnode_traits::is_always_equal::value) {
_STL_VERIFY(_List_Getal() == _That._List_Getal(), "allocator incompatible for merge");
}
#endif // _ITERATOR_DEBUG_LEVEL == 2
auto _First = _That._Unchecked_begin();
const auto _Last = _That._Unchecked_end();
while (_First != _Last) {
const auto _Candidate = _First._Ptr;
++_First;
const auto& _Keyval = _Traits::_Kfn(_Candidate->_Myval);
const size_t _Hashval = _Traitsobj(_Keyval);
auto _Target = _Find_last(_Keyval, _Hashval);
if constexpr (!_Traits::_Multi) {
if (_Target._Duplicate) {
continue;
}
}
_Check_max_size();
if (_Check_rehash_required_1()) {
_Rehash_for_1();
_Target = _Find_last(_Keyval, _Hashval);
}
// nothrow hereafter this iteration
const auto _Source_bucket = _Hashval & _That._Mask;
_That._Erase_bucket(_Candidate, _Source_bucket);
_Candidate->_Prev->_Next = _Candidate->_Next;
_Candidate->_Next->_Prev = _Candidate->_Prev;
--_That._List_Mypair()._Myval2._Mysize;
_Destroy_in_place(_Candidate->_Next); // TRANSITION, ABI
_Destroy_in_place(_Candidate->_Prev);
#if _ITERATOR_DEBUG_LEVEL == 2
_List_Mypair()._Myval2._Adopt_unique(_That._List_Mypair()._Myval2, _Candidate);
#endif // _ITERATOR_DEBUG_LEVEL == 2
(void) _Insert_new_node_before(_Hashval, _Target._Insert_before, _Candidate);
}
}
template <class _Other_traits>
void merge(_Hash<_Other_traits>&& _That) { // transfer all nodes from _That into *this
static_assert(_STD is_same_v<_Nodeptr, typename _Hash<_Other_traits>::_Nodeptr>,
"merge() requires an argument with a compatible node type.");
static_assert(_STD is_same_v<allocator_type, typename _Hash<_Other_traits>::allocator_type>,
"merge() requires an argument with the same allocator type.");
merge(_That);
}
protected:
_Nodeptr _Extract(const _Unchecked_const_iterator _Where) {
const size_type _Bucket = bucket(_Traits::_Kfn(*_Where));
_Erase_bucket(_Where._Ptr, _Bucket);
return _List_Mypair()._Myval2._Unlinknode(_Where._Ptr);
}
template <class _Kx>
_Nodeptr _Extract(const _Kx& _Keyval) {
const size_t _Hashval = _Traitsobj(_Keyval);
_Nodeptr _Target;
if constexpr (_Traits::_Multi) {
_Target = _Find_first(_Keyval, _Hashval);
if (_Target == _List_Mypair()._Myval2._Myhead) {
return _Nodeptr{};
}
} else {
_Target = _Find_last(_Keyval, _Hashval)._Duplicate;
if (_Target == nullptr) {
return _Nodeptr{};
}
}
_Erase_bucket(_Target, _Hashval & _Mask);
return _List_Mypair()._Myval2._Unlinknode(_Target);
}
public:
_STD conditional_t<_Traits::_Multi, iterator, _STD _Insert_return_type<iterator, node_type>> insert(node_type&& _Handle) {
// insert the node (if any) held in _Handle
if (_Handle.empty()) {
if constexpr (_Traits::_Multi) {
return end();
} else {
return {end(), false, _STD move(_Handle)};
}
}
#if _ITERATOR_DEBUG_LEVEL == 2
_STL_VERIFY(_List.get_allocator() == _Handle._Getal(), "node handle allocator incompatible for insert");
#endif // _ITERATOR_DEBUG_LEVEL == 2
const auto& _Keyval = _Traits::_Kfn(_Handle._Getptr()->_Myval);
const size_t _Hashval = _Traitsobj(_Keyval);
auto _Target = _Find_last(_Keyval, _Hashval);
if constexpr (!_Traits::_Multi) {
if (_Target._Duplicate) {
return {_List._Make_iter(_Target._Duplicate), false, _STD move(_Handle)};
}
}
_Check_max_size();
if (_Check_rehash_required_1()) {
_Rehash_for_1();
_Target = _Find_last(_Keyval, _Hashval);
}
const auto _Released = _Handle._Release();
_Destroy_in_place(_Released->_Next); // TRANSITION, ABI
_Destroy_in_place(_Released->_Prev);
const auto _Newnode = _Insert_new_node_before(_Hashval, _Target._Insert_before, _Released);
if constexpr (_Traits::_Multi) {
return _List._Make_iter(_Newnode);
} else {
return {_List._Make_iter(_Newnode), true, node_type{}};
}
}
#endif // _HAS_CXX17
protected:
template <class _Keyty>
_NODISCARD _STD _Hash_find_last_result<_Nodeptr> _Find_last(const _Keyty& _Keyval, const size_t _Hashval) const {
// find the insertion point for _Keyval and whether an element identical to _Keyval is already in the container
const size_type _Bucket = _Hashval & _Mask;
_Nodeptr _Where = _Vec._Mypair._Myval2._Myfirst[(_Bucket << 1) + 1]._Ptr;
const _Nodeptr _End = _List_Mypair()._Myval2._Myhead;
if (_Where == _End) {
return {_End, _Nodeptr{}};
}
const _Nodeptr _Bucket_lo = _Vec._Mypair._Myval2._Myfirst[_Bucket << 1]._Ptr;
for (;;) {
// Search backwards to maintain sorted [_Bucket_lo, _Bucket_hi] when !_Standard
if (!_Traitsobj(_Keyval, _Traits::_Kfn(_Where->_Myval))) {
if constexpr (!_Traits::_Standard) {
if (_Traitsobj(_Traits::_Kfn(_Where->_Myval), _Keyval)) {
return {_Where->_Next, _Nodeptr{}};
}
}
return {_Where->_Next, _Where};
}
if (_Where == _Bucket_lo) {
return {_Where, _Nodeptr{}};
}
_Where = _Where->_Prev;
}
}
template <class _Keyty>
_NODISCARD _STD _Hash_find_last_result<_Nodeptr> _Find_hint(
const _Nodeptr _Hint, const _Keyty& _Keyval, const size_t _Hashval) const {
// if _Hint points to an element equivalent to _Keyval, returns _Hint; otherwise,
// returns _Find_last(_Keyval, _Hashval)
if (_Hint != _List_Mypair()._Myval2._Myhead && !_Traitsobj(_Traits::_Kfn(_Hint->_Myval), _Keyval)) {
if constexpr (!_Traits::_Standard) {
if (_Traitsobj(_Keyval, _Traits::_Kfn(_Hint->_Myval))) {
return _Find_last(_Keyval, _Hashval);
}
}
return {_Hint->_Next, _Hint};
}
return _Find_last(_Keyval, _Hashval);
}
_Nodeptr _Insert_new_node_before(
const size_t _Hashval, const _Nodeptr _Insert_before, const _Nodeptr _Newnode) noexcept {
const _Nodeptr _Insert_after = _Insert_before->_Prev;
++_List_Mypair()._Myval2._Mysize;
_Construct_in_place(_Newnode->_Next, _Insert_before);
_Construct_in_place(_Newnode->_Prev, _Insert_after);
_Insert_after->_Next = _Newnode;
_Insert_before->_Prev = _Newnode;
const auto _Head = _List_Mypair()._Myval2._Myhead;
const auto _Bucket_array = _Vec._Mypair._Myval2._Myfirst;
const size_type _Bucket = _Hashval & _Mask;
_Unchecked_iterator& _Bucket_lo = _Bucket_array[_Bucket << 1];
_Unchecked_iterator& _Bucket_hi = _Bucket_array[(_Bucket << 1) + 1];
if (_Bucket_lo._Ptr == _Head) {
// bucket is empty, set both
_Bucket_lo._Ptr = _Newnode;
_Bucket_hi._Ptr = _Newnode;
} else if (_Bucket_lo._Ptr == _Insert_before) {
// new node is the lowest element in the bucket
_Bucket_lo._Ptr = _Newnode;
} else if (_Bucket_hi._Ptr == _Insert_after) {
// new node is the highest element in the bucket
_Bucket_hi._Ptr = _Newnode;
}
#ifdef _ENABLE_STL_INTERNAL_CHECK
_Stl_internal_check_container_invariants();
#endif // _ENABLE_STL_INTERNAL_CHECK
return _Newnode;
}
void _Check_max_size() const {
const size_type _Oldsize = _List_Mypair()._Myval2._Mysize;
if (_Oldsize == _List.max_size()) {
_STD _Xlength_error("unordered_map/set too long");
}
}
bool _Check_rehash_required_1() const noexcept {
const size_type _Oldsize = _List_Mypair()._Myval2._Mysize;
const auto _Newsize = _Oldsize + 1;
return max_load_factor() < static_cast<float>(_Newsize) / static_cast<float>(bucket_count());
}
void _Rehash_for_1() {
const auto _Oldsize = _List_Mypair()._Myval2._Mysize;
const auto _Newsize = _Oldsize + 1;
_Forced_rehash(_Desired_grow_bucket_count(_Newsize));
}
void _Erase_bucket(_Nodeptr _Plist, size_type _Bucket) noexcept {
// remove the node _Plist from its bucket
_Nodeptr& _Bucket_lo = _Vec._Mypair._Myval2._Myfirst[_Bucket << 1]._Ptr;
_Nodeptr& _Bucket_hi = _Vec._Mypair._Myval2._Myfirst[(_Bucket << 1) + 1]._Ptr;
if (_Bucket_hi == _Plist) {
if (_Bucket_lo == _Plist) { // make bucket empty
const auto _End = _List_Mypair()._Myval2._Myhead;
_Bucket_lo = _End;
_Bucket_hi = _End;
} else {
_Bucket_hi = _Plist->_Prev; // move end back one element
}
} else if (_Bucket_lo == _Plist) {
_Bucket_lo = _Plist->_Next; // move beginning up one element
}
}
_NODISCARD size_type _Min_load_factor_buckets(const size_type _For_size) const noexcept {
// returns the minimum number of buckets necessary for the elements in _List
return static_cast<size_type>(_CSTD ceilf(static_cast<float>(_For_size) / max_load_factor()));
}
_NODISCARD size_type _Desired_grow_bucket_count(const size_type _For_size) const noexcept {
const size_type _Old_buckets = bucket_count();
const size_type _Req_buckets = (_STD max)(_Min_buckets, _Min_load_factor_buckets(_For_size));
if (_Old_buckets >= _Req_buckets) {
// we already have enough buckets so there's no need to change the count
return _Old_buckets;
}
if (_Old_buckets < 512 && _Old_buckets * 8 >= _Req_buckets) {
// if we are changing the bucket count and have less than 512 buckets, use 8x more buckets
return _Old_buckets * 8;
}
// power of 2 invariant means this will result in at least 2*_Old_buckets after round up in _Forced_rehash
return _Req_buckets;
}
void _Reinsert_with_invalid_vec() { // insert elements in [begin(), end()), distrusting existing _Vec elements
_Forced_rehash(_Desired_grow_bucket_count(_List.size()));
}
void _Forced_rehash(size_type _Buckets) {
// Force rehash of elements in _List, distrusting existing bucket assignments in _Vec.
// Assumes _Buckets is greater than _Min_buckets, and that changing to that many buckets doesn't violate
// load_factor() <= max_load_factor().
// Don't violate power of 2, fits in half the bucket vector invariant:
// (we assume because vector must use single allocations; as a result, its max_size fits in a size_t)
const unsigned long _Max_storage_buckets_log2 = _STD _Floor_of_log_2(static_cast<size_t>(_Vec.max_size() >> 1));
const auto _Max_storage_buckets = static_cast<size_type>(1) << _Max_storage_buckets_log2;
if (_Buckets > _Max_storage_buckets) {
_STD _Xlength_error("invalid hash bucket count");
}
// The above test also means that we won't perform a forbidden full shift when restoring the power of
// 2 invariant
// this round up to power of 2 in addition to the _Buckets > _Maxidx above means
// we'll at least double in size (the next power of 2 above _Maxidx)
_Buckets = static_cast<size_type>(1) << _STD _Ceiling_of_log_2(static_cast<size_t>(_Buckets));
const _Unchecked_iterator _End = _Unchecked_end();
_Vec._Assign_grow(_Buckets << 1, _End);
_Mask = _Buckets - 1;
_Maxidx = _Buckets;
_Clear_guard _Guard{this};
_Unchecked_iterator _Inserted = _Unchecked_begin();
// Remember the next _Inserted value as splices will change _Inserted's position arbitrarily.
for (_Unchecked_iterator _Next_inserted = _Inserted; _Inserted != _End; _Inserted = _Next_inserted) {
++_Next_inserted;
auto& _Inserted_key = _Traits::_Kfn(*_Inserted);
const size_type _Bucket = bucket(_Inserted_key);
// _Bucket_lo and _Bucket_hi are the *inclusive* range of elements in the bucket, or _Unchecked_end() if
// the bucket is empty; if !_Standard then [_Bucket_lo, _Bucket_hi] is a sorted range.
_Unchecked_iterator& _Bucket_lo = _Vec._Mypair._Myval2._Myfirst[_Bucket << 1];
_Unchecked_iterator& _Bucket_hi = _Vec._Mypair._Myval2._Myfirst[(_Bucket << 1) + 1];
if (_Bucket_lo == _End) {
// The bucket was empty, set it to the inserted element.
_Bucket_lo = _Inserted;
_Bucket_hi = _Inserted;
continue;
}
// Search the bucket for the insertion location and move element if necessary.
_Unchecked_const_iterator _Insert_before = _Bucket_hi;
if (!_Traitsobj(_Inserted_key, _Traits::_Kfn(*_Insert_before))) {
// The inserted element belongs at the end of the bucket; splice it there and set _Bucket_hi to the
// new bucket inclusive end.
++_Insert_before;
if (_Insert_before != _Inserted) { // avoid splice on element already in position
_MylistImpl::_Scary_val::_Unchecked_splice(_Insert_before._Ptr, _Inserted._Ptr, _Next_inserted._Ptr);
}
_Bucket_hi = _Inserted;
continue;
}
// The insertion point isn't *_Bucket_hi, so search [_Bucket_lo, _Bucket_hi) for insertion point; we
// go backwards to maintain sortedness when !_Standard.
for (;;) {
if (_Bucket_lo == _Insert_before) {
// There are no equivalent keys in the bucket, so insert it at the beginning.
// Element can't be already in position here because:
// * (for !_Standard) _Inserted_key < *_Insert_before or
// * (for _Standard) _Inserted_key != *_Insert_before
_MylistImpl::_Scary_val::_Unchecked_splice(_Insert_before._Ptr, _Inserted._Ptr, _Next_inserted._Ptr);
_Bucket_lo = _Inserted;
break;
}
if (!_Traitsobj(_Inserted_key, _Traits::_Kfn(*--_Insert_before))) {
// Found insertion point, move the element here, bucket bounds are already okay.
++_Insert_before;
// Element can't be already in position here because all elements we're inserting are after all
// the elements already in buckets, and *_Insert_before isn't the highest element in the bucket.
_MylistImpl::_Scary_val::_Unchecked_splice(_Insert_before._Ptr, _Inserted._Ptr, _Next_inserted._Ptr);
break;
}
}
}
_Guard._Target = nullptr;
#ifdef _ENABLE_STL_INTERNAL_CHECK
_Stl_internal_check_container_invariants();
#endif // _ENABLE_STL_INTERNAL_CHECK
}
float& _Max_bucket_size() noexcept {
return _Traitsobj._Get_max_bucket_size();
}
const float& _Max_bucket_size() const noexcept {
return _Traitsobj._Get_max_bucket_size();
}
_Alnode& _Getal() noexcept {
return _List_Getal();
}
const _Alnode& _Getal() const noexcept {
return _List_Getal();
}
struct _Multi_equal_check_result {
bool _Equal_possible = false;
_Unchecked_const_iterator _Subsequent_first{}; // only useful if _Equal_possible
};
_NODISCARD _Multi_equal_check_result _Multi_equal_check_equal_range(
const _Hash& _Right, _Unchecked_const_iterator _First1) const {
// check that an equal_range of elements starting with *_First1 are a permutation of the corresponding
// equal_range of elements in _Right
auto& _Keyval = _Traits::_Kfn(*_First1);
// find the start of the matching run in the other container
const size_t _Hashval = _Right._Traitsobj(_Keyval);
const size_type _Bucket = _Hashval & _Right._Mask;
auto _First2 = _Right._Vec._Mypair._Myval2._Myfirst[_Bucket << 1];
if (_First2 == _Right._Unchecked_end()) {
// no matching bucket, therefore no matching run
return {};
}
const auto _Bucket_hi = _Right._Vec._Mypair._Myval2._Myfirst[(_Bucket << 1) + 1];
for (; _Right._Traitsobj(_Traits::_Kfn(*_First2), _Keyval); ++_First2) {
// find first matching element in _Right
if (_First2 == _Bucket_hi) {
return {};
}
}
_Unchecked_const_iterator _Left_stop_at;
if constexpr (_Traits::_Standard) {
_Left_stop_at = _Unchecked_end();
} else {
// check the first elements for equivalence when !_Standard
if (_Right._Traitsobj(_Keyval, _Traits::_Kfn(*_First2))) {
return {};
}
const size_t _LHashval = _Traitsobj(_Keyval);
const size_type _LBucket = _LHashval & _Mask;
const auto _LBucket_hi = _Vec._Mypair._Myval2._Myfirst[(_LBucket << 1) + 1];
_Left_stop_at = _LBucket_hi;
++_Left_stop_at;
}
// trim matching prefixes
while (*_First1 == *_First2) {
// the right equal_range ends at the end of the bucket or on the first nonequal element
bool _Right_range_end = _First2 == _Bucket_hi;
++_First2;
if (!_Right_range_end) {
_Right_range_end = _Right._Traitsobj(_Keyval, _Traits::_Kfn(*_First2));
}
// the left equal_range ends at the end of the container or on the first nonequal element
++_First1;
const bool _Left_range_end = _First1 == _Left_stop_at || _Traitsobj(_Keyval, _Traits::_Kfn(*_First1));
if (_Left_range_end && _Right_range_end) {
// the equal_ranges were completely equal
return {true, _First1};
}
if (_Left_range_end || _Right_range_end) {
// one equal_range is a prefix of the other; not equal
return {};
}
}
// found a mismatched element, find the end of the equal_ranges and dispatch to _Check_match_counts
auto _Last1 = _First1;
auto _Last2 = _First2;
for (;;) {
bool _Right_range_end = _Last2 == _Bucket_hi;
++_Last2;
if (!_Right_range_end) {
_Right_range_end = _Right._Traitsobj(_Keyval, _Traits::_Kfn(*_Last2));
}
++_Last1;
const bool _Left_range_end = _Last1 == _Left_stop_at || _Traitsobj(_Keyval, _Traits::_Kfn(*_Last1));
if (_Left_range_end && _Right_range_end) {
// equal_ranges had the same length, check for permutation
return {_STD _Check_match_counts(_First1, _Last1, _First2, _Last2, _STD equal_to<>{}), _Last1};
}
if (_Left_range_end || _Right_range_end) {
// different number of elements in the range, not a permutation
return {};
}
}
}
template <bool _Multi2 = _Traits::_Multi, _STD enable_if_t<_Multi2, int> = 0>
_NODISCARD bool _Multi_equal(const _Hash& _Right) const {
static_assert(_Traits::_Multi, "This function only works with multi containers");
_STL_INTERNAL_CHECK(this->size() == _Right.size());
const auto _Last1 = _Unchecked_end();
auto _First1 = _Unchecked_begin();
while (_First1 != _Last1) {
const auto _Result = _Multi_equal_check_equal_range(_Right, _First1);
if (!_Result._Equal_possible) {
return false;
}
_First1 = _Result._Subsequent_first;
}
return true;
}
#ifdef _ENABLE_STL_INTERNAL_CHECK
public:
void _Stl_internal_check_container_invariants() const noexcept {
const size_type _Vecsize = _Vec.size();
_STL_INTERNAL_CHECK(_Vec._Mypair._Myval2._Mylast == _Vec._Mypair._Myval2._Myend);
_STL_INTERNAL_CHECK(_Vecsize >= _Min_buckets * 2);
_STL_INTERNAL_CHECK(_Maxidx == (_Vecsize >> 1));
_STL_INTERNAL_CHECK(_Maxidx - 1 == _Mask);
_STL_INTERNAL_CHECK(_Maxidx >= _Min_load_factor_buckets(_List.size()));
// asserts that bucket count is a power of 2:
_STL_INTERNAL_CHECK((static_cast<size_type>(1) << _STD _Floor_of_log_2(_Vecsize)) == _Vecsize);
_STL_INTERNAL_CHECK(load_factor() <= max_load_factor());
// In the test that counts number of allocator copies, avoid an extra rebind that would incorrectly count as
// a copy; otherwise, allow allocators that support only homogeneous compare.
#ifdef _USE_HETEROGENEOUS_ALLOCATOR_COMPARE_IN_INTERNAL_CHECK
_STL_INTERNAL_CHECK(_List_Getal() == _Vec._Mypair._Get_first());
#else
_STL_INTERNAL_CHECK(static_cast<_Aliter>(_List_Getal()) == _Vec._Mypair._Get_first());
#endif
#ifdef _STL_INTERNAL_CHECK_EXHAUSTIVE
size_type _Elements = 0;
const auto _End = _Unchecked_end();
for (size_type _Bucket = 0; _Bucket < _Maxidx; ++_Bucket) {
_Unchecked_const_iterator _Where = _Vec._Mypair._Myval2._Myfirst[_Bucket << 1];
const _Unchecked_const_iterator _Bucket_hi = _Vec._Mypair._Myval2._Myfirst[(_Bucket << 1) + 1];
if (_Where != _End) {
// check that the bucket is sorted for legacy hash_meow:
if constexpr (!_Traits::_Standard) {
if (_Where != _Bucket_hi) {
auto _SFirst = _Where;
auto _SNext = _Where;
for (;;) {
++_SNext;
if constexpr (_Traits::_Multi) {
_STL_INTERNAL_CHECK(!_Traitsobj(_Traits::_Kfn(*_SNext), _Traits::_Kfn(*_SFirst)));
} else {
_STL_INTERNAL_CHECK(_Traitsobj(_Traits::_Kfn(*_SFirst), _Traits::_Kfn(*_SNext)));
}
if (_SNext == _Bucket_hi) {
break;
}
_SFirst = _SNext;
}
}
}
// check that all the elements in the bucket belong in the bucket:
for (;;) {
++_Elements;
_STL_INTERNAL_CHECK(bucket(_Traits::_Kfn(*_Where)) == _Bucket);
if (_Where == _Bucket_hi) {
break;
}
++_Where;
}
}
}
_STL_INTERNAL_CHECK(_List.size() == _Elements);
#endif // _STL_INTERNAL_CHECK_EXHAUSTIVE
}
protected:
#endif // _ENABLE_STL_INTERNAL_CHECK
_Mylist _List; // list of elements, must initialize before _Vec
_STD _Hash_vec<_Aliter> _Vec; // "vector" of list iterators for buckets:
// each bucket is 2 iterators denoting the closed range of elements in the bucket,
// or both iterators set to _Unchecked_end() if the bucket is empty.
size_type _Mask; // the key mask
size_type _Maxidx; // current maximum key value, must be a power of 2
_Traits _Traitsobj; // traits to customize behavior
};
#if _HAS_CXX17
// For constraining deduction guides (N4950 [unord.req.general]/243.3)
template <class _Hasher>
using _Is_hasher = _STD negation<_STD disjunction<_STD is_integral<_Hasher>, _STD _Is_allocator<_Hasher>>>;
#endif // _HAS_CXX17
/*_EXPORT_STD*/ /* TRANSITION, VSO-1538698 */ template <class _Traits>
_NODISCARD bool _Hash_equal(const _Hash<_Traits>& _Left, const _Hash<_Traits>& _Right) {
if (_Left.size() != _Right.size()) {
return false;
}
if constexpr (_Traits::_Multi) {
return _Left._Multi_equal(_Right);
} else {
for (const auto& _LVal : _Left) {
// look for element with equivalent key
const auto& _Keyval = _Traits::_Kfn(_LVal);
const auto _Next2 = _Right._Find_last(_Keyval, _Right._Traitsobj(_Keyval))._Duplicate;
if (!(static_cast<bool>(_Next2) && _Traits::_Nonkfn(_LVal) == _Traits::_Nonkfn(_Next2->_Myval))) {
return false;
}
}
}
return true;
}
_STD_END
#pragma pop_macro("new")
_STL_RESTORE_CLANG_WARNINGS
#pragma warning(pop)
#pragma pack(pop)
#endif // _STL_COMPILER_PREPROCESSOR
#endif // _GEODE_XHASH_
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