[libcxx-commits] [libcxx] [libc++] implement `std::flat_multimap` (PR #113835)
Louis Dionne via libcxx-commits
libcxx-commits at lists.llvm.org
Fri Nov 8 11:29:22 PST 2024
================
@@ -0,0 +1,1182 @@
+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP___FLAT_MAP_FLAT_MULTIMAP_H
+#define _LIBCPP___FLAT_MAP_FLAT_MULTIMAP_H
+
+#include <__algorithm/lexicographical_compare_three_way.h>
+#include <__algorithm/ranges_equal.h>
+#include <__algorithm/ranges_equal_range.h>
+#include <__algorithm/ranges_inplace_merge.h>
+#include <__algorithm/ranges_is_sorted.h>
+#include <__algorithm/ranges_lower_bound.h>
+#include <__algorithm/ranges_partition_point.h>
+#include <__algorithm/ranges_stable_sort.h>
+#include <__algorithm/ranges_unique.h>
+#include <__algorithm/ranges_upper_bound.h>
+#include <__compare/synth_three_way.h>
+#include <__concepts/convertible_to.h>
+#include <__concepts/swappable.h>
+#include <__config>
+#include <__flat_map/sorted_equivalent.h>
+#include <__functional/invoke.h>
+#include <__functional/is_transparent.h>
+#include <__functional/operations.h>
+#include <__iterator/concepts.h>
+#include <__iterator/distance.h>
+#include <__iterator/iterator_traits.h>
+#include <__iterator/ranges_iterator_traits.h>
+#include <__iterator/reverse_iterator.h>
+#include <__memory/allocator_traits.h>
+#include <__memory/uses_allocator.h>
+#include <__memory/uses_allocator_construction.h>
+#include <__ranges/concepts.h>
+#include <__ranges/container_compatible_range.h>
+#include <__ranges/drop_view.h>
+#include <__ranges/ref_view.h>
+#include <__ranges/subrange.h>
+#include <__ranges/zip_view.h>
+#include <__type_traits/conjunction.h>
+#include <__type_traits/container_traits.h>
+#include <__type_traits/invoke.h>
+#include <__type_traits/is_allocator.h>
+#include <__type_traits/is_nothrow_constructible.h>
+#include <__type_traits/is_same.h>
+#include <__type_traits/maybe_const.h>
+#include <__utility/exception_guard.h>
+#include <__utility/pair.h>
+#include <initializer_list>
+#include <stdexcept>
+#include <string>
+#include <vector>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+# pragma GCC system_header
+#endif
+
+_LIBCPP_PUSH_MACROS
+#include <__undef_macros>
+
+#if _LIBCPP_STD_VER >= 23
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+template <class _Key,
+ class _Tp,
+ class _Compare = less<_Key>,
+ class _KeyContainer = vector<_Key>,
+ class _MappedContainer = vector<_Tp>>
+class flat_multimap {
+ template <bool _Const>
+ struct __iterator;
+
+ template <class, class, class, class, class>
+ friend class flat_multimap;
+
+ static_assert(is_same_v<_Key, typename _KeyContainer::value_type>);
+ static_assert(is_same_v<_Tp, typename _MappedContainer::value_type>);
+ static_assert(!is_same_v<_KeyContainer, std::vector<bool>>, "vector<bool> is not a sequence container");
+ static_assert(!is_same_v<_MappedContainer, std::vector<bool>>, "vector<bool> is not a sequence container");
+
+public:
+ // types
+ using key_type = _Key;
+ using mapped_type = _Tp;
+ using value_type = pair<key_type, mapped_type>;
+ using key_compare = __type_identity_t<_Compare>;
+ using reference = pair<const key_type&, mapped_type&>;
+ using const_reference = pair<const key_type&, const mapped_type&>;
+ using size_type = size_t;
+ using difference_type = ptrdiff_t;
+ using iterator = __iterator<false>; // see [container.requirements]
+ using const_iterator = __iterator<true>; // see [container.requirements]
+ using reverse_iterator = std::reverse_iterator<iterator>;
+ using const_reverse_iterator = std::reverse_iterator<const_iterator>;
+ using key_container_type = _KeyContainer;
+ using mapped_container_type = _MappedContainer;
+
+ class value_compare {
+ private:
+ key_compare __comp_;
+ value_compare(key_compare __c) : __comp_(__c) {}
+ friend flat_multimap;
+
+ public:
+ _LIBCPP_HIDE_FROM_ABI bool operator()(const_reference __x, const_reference __y) const {
+ return __comp_(__x.first, __y.first);
+ }
+ };
+
+ struct containers {
+ key_container_type keys;
+ mapped_container_type values;
+ };
+
+private:
+ template <class _Allocator>
+ _LIBCPP_HIDE_FROM_ABI static constexpr bool __allocator_ctor_constraint =
+ _And<uses_allocator<key_container_type, _Allocator>, uses_allocator<mapped_container_type, _Allocator>>::value;
+
+ _LIBCPP_HIDE_FROM_ABI static constexpr bool __is_compare_transparent = __is_transparent_v<_Compare, _Compare>;
+
+ template <bool _Const>
+ struct __iterator {
+ private:
+ using __key_iterator = ranges::iterator_t<const key_container_type>;
+ using __mapped_iterator = ranges::iterator_t<__maybe_const<_Const, mapped_container_type>>;
+ using __reference = pair<iter_reference_t<__key_iterator>, iter_reference_t<__mapped_iterator>>;
+
+ struct __arrow_proxy {
+ __reference __ref_;
+ _LIBCPP_HIDE_FROM_ABI __reference* operator->() { return std::addressof(__ref_); }
+ };
+
+ __key_iterator __key_iter_;
+ __mapped_iterator __mapped_iter_;
+
+ friend flat_multimap;
+
+ public:
+ using iterator_concept = random_access_iterator_tag;
+ // `flat_multimap::iterator` only satisfy "Cpp17InputIterator" named requirements, because
+ // its `reference` is not a reference type.
+ // However, to avoid surprising runtime behaviour when it is used with the
+ // Cpp17 algorithms or operations, iterator_category is set to random_access_iterator_tag.
+ using iterator_category = random_access_iterator_tag;
+ using value_type = flat_multimap::value_type;
+ using difference_type = flat_multimap::difference_type;
+
+ _LIBCPP_HIDE_FROM_ABI __iterator() = default;
+
+ _LIBCPP_HIDE_FROM_ABI __iterator(__iterator<!_Const> __i)
+ requires _Const && convertible_to<ranges::iterator_t<key_container_type>, __key_iterator> &&
+ convertible_to<ranges::iterator_t<mapped_container_type>, __mapped_iterator>
+ : __key_iter_(std::move(__i.__key_iter_)), __mapped_iter_(std::move(__i.__mapped_iter_)) {}
+
+ _LIBCPP_HIDE_FROM_ABI __iterator(__key_iterator __key_iter, __mapped_iterator __mapped_iter)
+ : __key_iter_(std::move(__key_iter)), __mapped_iter_(std::move(__mapped_iter)) {}
+
+ _LIBCPP_HIDE_FROM_ABI __reference operator*() const { return __reference(*__key_iter_, *__mapped_iter_); }
+ _LIBCPP_HIDE_FROM_ABI __arrow_proxy operator->() const { return __arrow_proxy(**this); }
+
+ _LIBCPP_HIDE_FROM_ABI __iterator& operator++() {
+ ++__key_iter_;
+ ++__mapped_iter_;
+ return *this;
+ }
+
+ _LIBCPP_HIDE_FROM_ABI __iterator operator++(int) {
+ __iterator __tmp(*this);
+ ++*this;
+ return __tmp;
+ }
+
+ _LIBCPP_HIDE_FROM_ABI __iterator& operator--() {
+ --__key_iter_;
+ --__mapped_iter_;
+ return *this;
+ }
+
+ _LIBCPP_HIDE_FROM_ABI __iterator operator--(int) {
+ __iterator __tmp(*this);
+ --*this;
+ return __tmp;
+ }
+
+ _LIBCPP_HIDE_FROM_ABI __iterator& operator+=(difference_type __x) {
+ __key_iter_ += __x;
+ __mapped_iter_ += __x;
+ return *this;
+ }
+
+ _LIBCPP_HIDE_FROM_ABI __iterator& operator-=(difference_type __x) {
+ __key_iter_ -= __x;
+ __mapped_iter_ -= __x;
+ return *this;
+ }
+
+ _LIBCPP_HIDE_FROM_ABI __reference operator[](difference_type __n) const { return *(*this + __n); }
+
+ _LIBCPP_HIDE_FROM_ABI friend constexpr bool operator==(const __iterator& __x, const __iterator& __y) {
+ return __x.__key_iter_ == __y.__key_iter_;
+ }
+
+ _LIBCPP_HIDE_FROM_ABI friend bool operator<(const __iterator& __x, const __iterator& __y) {
+ return __x.__key_iter_ < __y.__key_iter_;
+ }
+
+ _LIBCPP_HIDE_FROM_ABI friend bool operator>(const __iterator& __x, const __iterator& __y) { return __y < __x; }
+
+ _LIBCPP_HIDE_FROM_ABI friend bool operator<=(const __iterator& __x, const __iterator& __y) { return !(__y < __x); }
+
+ _LIBCPP_HIDE_FROM_ABI friend bool operator>=(const __iterator& __x, const __iterator& __y) { return !(__x < __y); }
+
+ _LIBCPP_HIDE_FROM_ABI friend auto operator<=>(const __iterator& __x, const __iterator& __y)
+ requires three_way_comparable<__key_iterator>
+ {
+ return __x.__key_iter_ <=> __y.__key_iter_;
+ }
+
+ _LIBCPP_HIDE_FROM_ABI friend __iterator operator+(const __iterator& __i, difference_type __n) {
+ auto __tmp = __i;
+ __tmp += __n;
+ return __tmp;
+ }
+
+ _LIBCPP_HIDE_FROM_ABI friend __iterator operator+(difference_type __n, const __iterator& __i) { return __i + __n; }
+
+ _LIBCPP_HIDE_FROM_ABI friend __iterator operator-(const __iterator& __i, difference_type __n) {
+ auto __tmp = __i;
+ __tmp -= __n;
+ return __tmp;
+ }
+
+ _LIBCPP_HIDE_FROM_ABI friend difference_type operator-(const __iterator& __x, const __iterator& __y) {
+ return difference_type(__x.__key_iter_ - __y.__key_iter_);
+ }
+ };
+
+public:
+ // [flat.map.cons], construct/copy/destroy
+ _LIBCPP_HIDE_FROM_ABI flat_multimap() noexcept(
+ is_nothrow_default_constructible_v<_KeyContainer> && is_nothrow_default_constructible_v<_MappedContainer> &&
+ is_nothrow_default_constructible_v<_Compare>)
+ : __containers_(), __compare_() {}
+
+ _LIBCPP_HIDE_FROM_ABI flat_multimap(const flat_multimap&) = default;
+
+ // The copy/move constructors are not specified in the spec, which means they should be defaulted.
+ // However, the move constructor can potentially leave a moved-from object in an inconsistent
+ // state if an exception is thrown.
+ _LIBCPP_HIDE_FROM_ABI flat_multimap(flat_multimap&& __other) noexcept(
+ is_nothrow_move_constructible_v<_KeyContainer> && is_nothrow_move_constructible_v<_MappedContainer> &&
+ is_nothrow_move_constructible_v<_Compare>)
+# if _LIBCPP_HAS_EXCEPTIONS
+ try
+# endif // _LIBCPP_HAS_EXCEPTIONS
+ : __containers_(std::move(__other.__containers_)), __compare_(std::move(__other.__compare_)) {
+ __other.clear();
+# if _LIBCPP_HAS_EXCEPTIONS
+ } catch (...) {
+ __other.clear();
+ // gcc does not like the `throw` keyword in a conditional noexcept function
+ if constexpr (!(is_nothrow_move_constructible_v<_KeyContainer> &&
+ is_nothrow_move_constructible_v<_MappedContainer> && is_nothrow_move_constructible_v<_Compare>)) {
+ throw;
+ }
+# endif // _LIBCPP_HAS_EXCEPTIONS
+ }
+
+ template <class _Allocator>
+ requires __allocator_ctor_constraint<_Allocator>
+ _LIBCPP_HIDE_FROM_ABI flat_multimap(const flat_multimap& __other, const _Allocator& __alloc)
+ : flat_multimap(__ctor_uses_allocator_tag{},
+ __alloc,
+ __other.__containers_.keys,
+ __other.__containers_.values,
+ __other.__compare_) {}
+
+ template <class _Allocator>
+ requires __allocator_ctor_constraint<_Allocator>
+ _LIBCPP_HIDE_FROM_ABI flat_multimap(flat_multimap&& __other, const _Allocator& __alloc)
+# if _LIBCPP_HAS_EXCEPTIONS
+ try
+# endif // _LIBCPP_HAS_EXCEPTIONS
+ : flat_multimap(__ctor_uses_allocator_tag{},
+ __alloc,
+ std::move(__other.__containers_.keys),
+ std::move(__other.__containers_.values),
+ std::move(__other.__compare_)) {
+ __other.clear();
+# if _LIBCPP_HAS_EXCEPTIONS
+ } catch (...) {
+ __other.clear();
+ throw;
+# endif // _LIBCPP_HAS_EXCEPTIONS
+ }
+
+ _LIBCPP_HIDE_FROM_ABI flat_multimap(
+ key_container_type __key_cont, mapped_container_type __mapped_cont, const key_compare& __comp = key_compare())
+ : __containers_{.keys = std::move(__key_cont), .values = std::move(__mapped_cont)}, __compare_(__comp) {
+ _LIBCPP_ASSERT_VALID_INPUT_RANGE(__containers_.keys.size() == __containers_.values.size(),
+ "flat_multimap keys and mapped containers have different size");
+ __sort();
+ }
+
+ template <class _Allocator>
+ requires __allocator_ctor_constraint<_Allocator>
+ _LIBCPP_HIDE_FROM_ABI flat_multimap(
+ const key_container_type& __key_cont, const mapped_container_type& __mapped_cont, const _Allocator& __alloc)
+ : flat_multimap(__ctor_uses_allocator_tag{}, __alloc, __key_cont, __mapped_cont) {
+ _LIBCPP_ASSERT_VALID_INPUT_RANGE(__containers_.keys.size() == __containers_.values.size(),
+ "flat_multimap keys and mapped containers have different size");
+ __sort();
+ }
+
+ template <class _Allocator>
+ requires __allocator_ctor_constraint<_Allocator>
+ _LIBCPP_HIDE_FROM_ABI
+ flat_multimap(const key_container_type& __key_cont,
+ const mapped_container_type& __mapped_cont,
+ const key_compare& __comp,
+ const _Allocator& __alloc)
+ : flat_multimap(__ctor_uses_allocator_tag{}, __alloc, __key_cont, __mapped_cont, __comp) {
+ _LIBCPP_ASSERT_VALID_INPUT_RANGE(__containers_.keys.size() == __containers_.values.size(),
+ "flat_multimap keys and mapped containers have different size");
+ __sort();
+ }
+
+ _LIBCPP_HIDE_FROM_ABI
+ flat_multimap(sorted_equivalent_t,
+ key_container_type __key_cont,
+ mapped_container_type __mapped_cont,
+ const key_compare& __comp = key_compare())
+ : __containers_{.keys = std::move(__key_cont), .values = std::move(__mapped_cont)}, __compare_(__comp) {
+ _LIBCPP_ASSERT_VALID_INPUT_RANGE(__containers_.keys.size() == __containers_.values.size(),
+ "flat_multimap keys and mapped containers have different size");
+ _LIBCPP_ASSERT_SEMANTIC_REQUIREMENT(__is_sorted(__containers_.keys), "Key container is not sorted");
+ }
+
+ template <class _Allocator>
+ requires __allocator_ctor_constraint<_Allocator>
+ _LIBCPP_HIDE_FROM_ABI
+ flat_multimap(sorted_equivalent_t,
+ const key_container_type& __key_cont,
+ const mapped_container_type& __mapped_cont,
+ const _Allocator& __alloc)
+ : flat_multimap(__ctor_uses_allocator_tag{}, __alloc, __key_cont, __mapped_cont) {
+ _LIBCPP_ASSERT_VALID_INPUT_RANGE(__containers_.keys.size() == __containers_.values.size(),
+ "flat_multimap keys and mapped containers have different size");
+ _LIBCPP_ASSERT_SEMANTIC_REQUIREMENT(__is_sorted(__containers_.keys), "Key container is not sorted");
+ }
+
+ template <class _Allocator>
+ requires __allocator_ctor_constraint<_Allocator>
+ _LIBCPP_HIDE_FROM_ABI
+ flat_multimap(sorted_equivalent_t,
+ const key_container_type& __key_cont,
+ const mapped_container_type& __mapped_cont,
+ const key_compare& __comp,
+ const _Allocator& __alloc)
+ : flat_multimap(__ctor_uses_allocator_tag{}, __alloc, __key_cont, __mapped_cont, __comp) {
+ _LIBCPP_ASSERT_VALID_INPUT_RANGE(__containers_.keys.size() == __containers_.values.size(),
+ "flat_multimap keys and mapped containers have different size");
+ _LIBCPP_ASSERT_SEMANTIC_REQUIREMENT(__is_sorted(__containers_.keys), "Key container is not sorted");
+ }
+
+ _LIBCPP_HIDE_FROM_ABI explicit flat_multimap(const key_compare& __comp) : __containers_(), __compare_(__comp) {}
+
+ template <class _Allocator>
+ requires __allocator_ctor_constraint<_Allocator>
+ _LIBCPP_HIDE_FROM_ABI flat_multimap(const key_compare& __comp, const _Allocator& __alloc)
+ : flat_multimap(__ctor_uses_allocator_empty_tag{}, __alloc, __comp) {}
+
+ template <class _Allocator>
+ requires __allocator_ctor_constraint<_Allocator>
+ _LIBCPP_HIDE_FROM_ABI explicit flat_multimap(const _Allocator& __alloc)
+ : flat_multimap(__ctor_uses_allocator_empty_tag{}, __alloc) {}
+
+ template <class _InputIterator>
+ requires __has_input_iterator_category<_InputIterator>::value
+ _LIBCPP_HIDE_FROM_ABI
+ flat_multimap(_InputIterator __first, _InputIterator __last, const key_compare& __comp = key_compare())
+ : __containers_(), __compare_(__comp) {
+ insert(__first, __last);
+ }
+
+ template <class _InputIterator, class _Allocator>
+ requires(__has_input_iterator_category<_InputIterator>::value && __allocator_ctor_constraint<_Allocator>)
+ _LIBCPP_HIDE_FROM_ABI
+ flat_multimap(_InputIterator __first, _InputIterator __last, const key_compare& __comp, const _Allocator& __alloc)
+ : flat_multimap(__ctor_uses_allocator_empty_tag{}, __alloc, __comp) {
+ insert(__first, __last);
+ }
+
+ template <class _InputIterator, class _Allocator>
+ requires(__has_input_iterator_category<_InputIterator>::value && __allocator_ctor_constraint<_Allocator>)
+ _LIBCPP_HIDE_FROM_ABI flat_multimap(_InputIterator __first, _InputIterator __last, const _Allocator& __alloc)
+ : flat_multimap(__ctor_uses_allocator_empty_tag{}, __alloc) {
+ insert(__first, __last);
+ }
+
+ template <_ContainerCompatibleRange<value_type> _Range>
+ _LIBCPP_HIDE_FROM_ABI flat_multimap(from_range_t __fr, _Range&& __rg)
+ : flat_multimap(__fr, std::forward<_Range>(__rg), key_compare()) {}
+
+ template <_ContainerCompatibleRange<value_type> _Range, class _Allocator>
+ requires __allocator_ctor_constraint<_Allocator>
+ _LIBCPP_HIDE_FROM_ABI flat_multimap(from_range_t, _Range&& __rg, const _Allocator& __alloc)
+ : flat_multimap(__ctor_uses_allocator_empty_tag{}, __alloc) {
+ insert_range(std::forward<_Range>(__rg));
+ }
+
+ template <_ContainerCompatibleRange<value_type> _Range>
+ _LIBCPP_HIDE_FROM_ABI flat_multimap(from_range_t, _Range&& __rg, const key_compare& __comp) : flat_multimap(__comp) {
+ insert_range(std::forward<_Range>(__rg));
+ }
+
+ template <_ContainerCompatibleRange<value_type> _Range, class _Allocator>
+ requires __allocator_ctor_constraint<_Allocator>
+ _LIBCPP_HIDE_FROM_ABI flat_multimap(from_range_t, _Range&& __rg, const key_compare& __comp, const _Allocator& __alloc)
+ : flat_multimap(__ctor_uses_allocator_empty_tag{}, __alloc, __comp) {
+ insert_range(std::forward<_Range>(__rg));
+ }
+
+ template <class _InputIterator>
+ requires __has_input_iterator_category<_InputIterator>::value
+ _LIBCPP_HIDE_FROM_ABI flat_multimap(
+ sorted_equivalent_t, _InputIterator __first, _InputIterator __last, const key_compare& __comp = key_compare())
+ : __containers_(), __compare_(__comp) {
+ insert(sorted_equivalent, __first, __last);
+ }
+ template <class _InputIterator, class _Allocator>
+ requires(__has_input_iterator_category<_InputIterator>::value && __allocator_ctor_constraint<_Allocator>)
+ _LIBCPP_HIDE_FROM_ABI
+ flat_multimap(sorted_equivalent_t,
+ _InputIterator __first,
+ _InputIterator __last,
+ const key_compare& __comp,
+ const _Allocator& __alloc)
+ : flat_multimap(__ctor_uses_allocator_empty_tag{}, __alloc, __comp) {
+ insert(sorted_equivalent, __first, __last);
+ }
+
+ template <class _InputIterator, class _Allocator>
+ requires(__has_input_iterator_category<_InputIterator>::value && __allocator_ctor_constraint<_Allocator>)
+ _LIBCPP_HIDE_FROM_ABI
+ flat_multimap(sorted_equivalent_t, _InputIterator __first, _InputIterator __last, const _Allocator& __alloc)
+ : flat_multimap(__ctor_uses_allocator_empty_tag{}, __alloc) {
+ insert(sorted_equivalent, __first, __last);
+ }
+
+ _LIBCPP_HIDE_FROM_ABI flat_multimap(initializer_list<value_type> __il, const key_compare& __comp = key_compare())
+ : flat_multimap(__il.begin(), __il.end(), __comp) {}
+
+ template <class _Allocator>
+ requires __allocator_ctor_constraint<_Allocator>
+ _LIBCPP_HIDE_FROM_ABI
+ flat_multimap(initializer_list<value_type> __il, const key_compare& __comp, const _Allocator& __alloc)
+ : flat_multimap(__il.begin(), __il.end(), __comp, __alloc) {}
+
+ template <class _Allocator>
+ requires __allocator_ctor_constraint<_Allocator>
+ _LIBCPP_HIDE_FROM_ABI flat_multimap(initializer_list<value_type> __il, const _Allocator& __alloc)
+ : flat_multimap(__il.begin(), __il.end(), __alloc) {}
+
+ _LIBCPP_HIDE_FROM_ABI
+ flat_multimap(sorted_equivalent_t, initializer_list<value_type> __il, const key_compare& __comp = key_compare())
+ : flat_multimap(sorted_equivalent, __il.begin(), __il.end(), __comp) {}
+
+ template <class _Allocator>
+ requires __allocator_ctor_constraint<_Allocator>
+ _LIBCPP_HIDE_FROM_ABI flat_multimap(
+ sorted_equivalent_t, initializer_list<value_type> __il, const key_compare& __comp, const _Allocator& __alloc)
+ : flat_multimap(sorted_equivalent, __il.begin(), __il.end(), __comp, __alloc) {}
+
+ template <class _Allocator>
+ requires __allocator_ctor_constraint<_Allocator>
+ _LIBCPP_HIDE_FROM_ABI flat_multimap(sorted_equivalent_t, initializer_list<value_type> __il, const _Allocator& __alloc)
+ : flat_multimap(sorted_equivalent, __il.begin(), __il.end(), __alloc) {}
+
+ _LIBCPP_HIDE_FROM_ABI flat_multimap& operator=(initializer_list<value_type> __il) {
+ clear();
+ insert(__il);
+ return *this;
+ }
+
+ // copy/move assignment are not specified in the spec (defaulted)
+ // but move assignment can potentially leave moved from object in an inconsistent
+ // state if an exception is thrown
+ _LIBCPP_HIDE_FROM_ABI flat_multimap& operator=(const flat_multimap&) = default;
+
+ _LIBCPP_HIDE_FROM_ABI flat_multimap& operator=(flat_multimap&& __other) noexcept(
+ is_nothrow_move_assignable_v<_KeyContainer> && is_nothrow_move_assignable_v<_MappedContainer> &&
+ is_nothrow_move_assignable_v<_Compare>) {
+ auto __clear_other_guard = std::__make_scope_guard([&]() noexcept { __other.clear() /* noexcept */; });
+ auto __clear_self_guard = std::__make_exception_guard([&]() noexcept { clear() /* noexcept */; });
+ __containers_ = std::move(__other.__containers_);
+ __compare_ = std::move(__other.__compare_);
+ __clear_self_guard.__complete();
+ return *this;
+ }
+
+ // iterators
+ _LIBCPP_HIDE_FROM_ABI iterator begin() noexcept {
+ return iterator(__containers_.keys.begin(), __containers_.values.begin());
+ }
+
+ _LIBCPP_HIDE_FROM_ABI const_iterator begin() const noexcept {
+ return const_iterator(__containers_.keys.begin(), __containers_.values.begin());
+ }
+
+ _LIBCPP_HIDE_FROM_ABI iterator end() noexcept {
+ return iterator(__containers_.keys.end(), __containers_.values.end());
+ }
+
+ _LIBCPP_HIDE_FROM_ABI const_iterator end() const noexcept {
+ return const_iterator(__containers_.keys.end(), __containers_.values.end());
+ }
+
+ _LIBCPP_HIDE_FROM_ABI reverse_iterator rbegin() noexcept { return reverse_iterator(end()); }
+ _LIBCPP_HIDE_FROM_ABI const_reverse_iterator rbegin() const noexcept { return const_reverse_iterator(end()); }
+ _LIBCPP_HIDE_FROM_ABI reverse_iterator rend() noexcept { return reverse_iterator(begin()); }
+ _LIBCPP_HIDE_FROM_ABI const_reverse_iterator rend() const noexcept { return const_reverse_iterator(begin()); }
+
+ _LIBCPP_HIDE_FROM_ABI const_iterator cbegin() const noexcept { return begin(); }
+ _LIBCPP_HIDE_FROM_ABI const_iterator cend() const noexcept { return end(); }
+ _LIBCPP_HIDE_FROM_ABI const_reverse_iterator crbegin() const noexcept { return const_reverse_iterator(end()); }
+ _LIBCPP_HIDE_FROM_ABI const_reverse_iterator crend() const noexcept { return const_reverse_iterator(begin()); }
+
+ // [flat.map.capacity], capacity
+ [[nodiscard]] _LIBCPP_HIDE_FROM_ABI bool empty() const noexcept { return __containers_.keys.empty(); }
+
+ _LIBCPP_HIDE_FROM_ABI size_type size() const noexcept { return __containers_.keys.size(); }
+
+ _LIBCPP_HIDE_FROM_ABI size_type max_size() const noexcept {
+ return std::min<size_type>(__containers_.keys.max_size(), __containers_.values.max_size());
+ }
+
+ // [flat.map.modifiers], modifiers
+ template <class... _Args>
+ requires is_constructible_v<pair<key_type, mapped_type>, _Args...> && is_move_constructible_v<key_type> &&
+ is_move_constructible_v<mapped_type>
+ _LIBCPP_HIDE_FROM_ABI iterator emplace(_Args&&... __args) {
+ std::pair<key_type, mapped_type> __pair(std::forward<_Args>(__args)...);
+ return __search_and_emplace_with(ranges::upper_bound, std::move(__pair.first), std::move(__pair.second));
+ }
+
+ template <class... _Args>
+ requires is_constructible_v<pair<key_type, mapped_type>, _Args...>
+ _LIBCPP_HIDE_FROM_ABI iterator emplace_hint(const_iterator __hint, _Args&&... __args) {
+ std::pair<key_type, mapped_type> __pair(std::forward<_Args>(__args)...);
+
+ auto __prev_bigger = __hint != cbegin() && __compare_(__pair.first, (__hint - 1)->first);
+ auto __next_smaller = __hint != cend() && __compare_(__hint->first, __pair.first);
+
+ if (!__prev_bigger && !__next_smaller) {
+ // hint correct, just emplace
+ return __emplace_exact_pos(
+ __hint.__key_iter_, __hint.__mapped_iter_, std::move(__pair.first), std::move(__pair.second));
+ } else if (__prev_bigger && !__next_smaller) {
+ // the hint position is more to the right then the key should have been.
+ // we want to emplace the element to a position as right as possible
+ // e.g. Insert new element "2" in the following range
+ // 1, 1, 2, 2, 2, 3, 4, 6
+ // ^
+ // |
+ // hint
+ // We want to insert "2" after the last existing "2"
+ return __search_and_emplace_with(ranges::upper_bound, std::move(__pair.first), std::move(__pair.second));
+ } else {
+ // !__prev_bigger && __next_smaller
+ // todo assert this condition. it is not possible that __prev_bigger && __next_smaller, otherwise the multimap is
+ // not sorted
+
+ // the hint position is more to the left then the key should have been.
+ // we want to emplace the element to a position as left as possible
+ // 1, 1, 2, 2, 2, 3, 4, 6
+ // ^
+ // |
+ // hint
+ // We want to insert "2" before the first existing "2"
+ return __search_and_emplace_with(ranges::lower_bound, std::move(__pair.first), std::move(__pair.second));
+ }
+ }
+
+ _LIBCPP_HIDE_FROM_ABI iterator insert(const value_type& __x) { return emplace(__x); }
+
+ _LIBCPP_HIDE_FROM_ABI iterator insert(value_type&& __x) { return emplace(std::move(__x)); }
+
+ _LIBCPP_HIDE_FROM_ABI iterator insert(const_iterator __hint, const value_type& __x) {
+ return emplace_hint(__hint, __x);
+ }
+
+ _LIBCPP_HIDE_FROM_ABI iterator insert(const_iterator __hint, value_type&& __x) {
+ return emplace_hint(__hint, std::move(__x));
+ }
+
+ template <class _Pp>
+ requires is_constructible_v<pair<key_type, mapped_type>, _Pp>
+ _LIBCPP_HIDE_FROM_ABI iterator insert(_Pp&& __x) {
+ return emplace(std::forward<_Pp>(__x));
+ }
+
+ template <class _Pp>
+ requires is_constructible_v<pair<key_type, mapped_type>, _Pp>
+ _LIBCPP_HIDE_FROM_ABI iterator insert(const_iterator __hint, _Pp&& __x) {
+ return emplace_hint(__hint, std::forward<_Pp>(__x));
+ }
+
+ template <class _InputIterator>
+ requires __has_input_iterator_category<_InputIterator>::value
+ _LIBCPP_HIDE_FROM_ABI void insert(_InputIterator __first, _InputIterator __last) {
+ if constexpr (sized_sentinel_for<_InputIterator, _InputIterator>) {
+ __reserve(__last - __first);
+ }
+ __append_sort_merge</*WasSorted = */ false>(std::move(__first), std::move(__last));
+ }
+
+ template <class _InputIterator>
+ requires __has_input_iterator_category<_InputIterator>::value
+ void insert(sorted_equivalent_t, _InputIterator __first, _InputIterator __last) {
+ if constexpr (sized_sentinel_for<_InputIterator, _InputIterator>) {
+ __reserve(__last - __first);
+ }
+
+ __append_sort_merge</*WasSorted = */ true>(std::move(__first), std::move(__last));
+ }
+
+ template <_ContainerCompatibleRange<value_type> _Range>
+ _LIBCPP_HIDE_FROM_ABI void insert_range(_Range&& __range) {
+ if constexpr (ranges::sized_range<_Range>) {
+ __reserve(ranges::size(__range));
+ }
+
+ __append_sort_merge</*WasSorted = */ false>(ranges::begin(__range), ranges::end(__range));
+ }
+
+ _LIBCPP_HIDE_FROM_ABI void insert(initializer_list<value_type> __il) { insert(__il.begin(), __il.end()); }
+
+ _LIBCPP_HIDE_FROM_ABI void insert(sorted_equivalent_t, initializer_list<value_type> __il) {
+ insert(sorted_equivalent, __il.begin(), __il.end());
+ }
+
+ _LIBCPP_HIDE_FROM_ABI containers extract() && {
+ auto __guard = std::__make_scope_guard([&]() noexcept { clear() /* noexcept */; });
+ auto __ret = std::move(__containers_);
+ return __ret;
+ }
+
+ _LIBCPP_HIDE_FROM_ABI void replace(key_container_type&& __key_cont, mapped_container_type&& __mapped_cont) {
+ _LIBCPP_ASSERT_VALID_INPUT_RANGE(
+ __key_cont.size() == __mapped_cont.size(), "flat_multimap keys and mapped containers have different size");
+
+ _LIBCPP_ASSERT_SEMANTIC_REQUIREMENT(__is_sorted(__key_cont), "Key container is not sorted");
+ auto __guard = std::__make_exception_guard([&]() noexcept { clear() /* noexcept */; });
+ __containers_.keys = std::move(__key_cont);
+ __containers_.values = std::move(__mapped_cont);
+ __guard.__complete();
+ }
+
+ _LIBCPP_HIDE_FROM_ABI iterator erase(iterator __position) {
+ return __erase(__position.__key_iter_, __position.__mapped_iter_);
+ }
+
+ _LIBCPP_HIDE_FROM_ABI iterator erase(const_iterator __position) {
+ return __erase(__position.__key_iter_, __position.__mapped_iter_);
+ }
+
+ _LIBCPP_HIDE_FROM_ABI size_type erase(const key_type& __x) {
+ auto [__first, __last] = equal_range(__x);
+ auto __res = __last - __first;
+ erase(__first, __last);
+ return __res;
+ }
+
+ template <class _Kp>
+ requires(__is_compare_transparent && !is_convertible_v<_Kp &&, iterator> &&
+ !is_convertible_v<_Kp &&, const_iterator>)
+ _LIBCPP_HIDE_FROM_ABI size_type erase(_Kp&& __x) {
+ auto [__first, __last] = equal_range(__x);
+ auto __res = __last - __first;
+ erase(__first, __last);
+ return __res;
+ }
+
+ _LIBCPP_HIDE_FROM_ABI iterator erase(const_iterator __first, const_iterator __last) {
+ auto __on_failure = std::__make_exception_guard([&]() noexcept { clear() /* noexcept */; });
+ auto __key_it = __containers_.keys.erase(__first.__key_iter_, __last.__key_iter_);
+ auto __mapped_it = __containers_.values.erase(__first.__mapped_iter_, __last.__mapped_iter_);
+ __on_failure.__complete();
+ return iterator(std::move(__key_it), std::move(__mapped_it));
+ }
+
+ _LIBCPP_HIDE_FROM_ABI void swap(flat_multimap& __y) noexcept {
+ // warning: The spec has unconditional noexcept, which means that
+ // if any of the following functions throw an exception,
+ // std::terminate will be called
+ ranges::swap(__compare_, __y.__compare_);
+ ranges::swap(__containers_.keys, __y.__containers_.keys);
+ ranges::swap(__containers_.values, __y.__containers_.values);
+ }
+
+ _LIBCPP_HIDE_FROM_ABI void clear() noexcept {
+ __containers_.keys.clear();
+ __containers_.values.clear();
+ }
+
+ // observers
+ _LIBCPP_HIDE_FROM_ABI key_compare key_comp() const { return __compare_; }
+ _LIBCPP_HIDE_FROM_ABI value_compare value_comp() const { return value_compare(__compare_); }
+
+ _LIBCPP_HIDE_FROM_ABI const key_container_type& keys() const noexcept { return __containers_.keys; }
+ _LIBCPP_HIDE_FROM_ABI const mapped_container_type& values() const noexcept { return __containers_.values; }
+
+ // map operations
+ _LIBCPP_HIDE_FROM_ABI iterator find(const key_type& __x) { return __find_impl(*this, __x); }
+
+ _LIBCPP_HIDE_FROM_ABI const_iterator find(const key_type& __x) const { return __find_impl(*this, __x); }
+
+ template <class _Kp>
+ requires __is_compare_transparent
+ _LIBCPP_HIDE_FROM_ABI iterator find(const _Kp& __x) {
+ return __find_impl(*this, __x);
+ }
+
+ template <class _Kp>
+ requires __is_compare_transparent
+ _LIBCPP_HIDE_FROM_ABI const_iterator find(const _Kp& __x) const {
+ return __find_impl(*this, __x);
+ }
+
+ _LIBCPP_HIDE_FROM_ABI size_type count(const key_type& __x) const {
+ auto [__first, __last] = equal_range(__x);
+ return __last - __first;
+ }
+
+ template <class _Kp>
+ requires __is_compare_transparent
+ _LIBCPP_HIDE_FROM_ABI size_type count(const _Kp& __x) const {
+ auto [__first, __last] = equal_range(__x);
+ return __last - __first;
+ }
+
+ _LIBCPP_HIDE_FROM_ABI bool contains(const key_type& __x) const { return find(__x) != end(); }
+
+ template <class _Kp>
+ requires __is_compare_transparent
+ _LIBCPP_HIDE_FROM_ABI bool contains(const _Kp& __x) const {
+ return find(__x) != end();
+ }
+
+ _LIBCPP_HIDE_FROM_ABI iterator lower_bound(const key_type& __x) { return __lower_bound<iterator>(*this, __x); }
+
+ _LIBCPP_HIDE_FROM_ABI const_iterator lower_bound(const key_type& __x) const {
+ return __lower_bound<const_iterator>(*this, __x);
+ }
+
+ template <class _Kp>
+ requires __is_compare_transparent
+ _LIBCPP_HIDE_FROM_ABI iterator lower_bound(const _Kp& __x) {
+ return __lower_bound<iterator>(*this, __x);
+ }
+
+ template <class _Kp>
+ requires __is_compare_transparent
+ _LIBCPP_HIDE_FROM_ABI const_iterator lower_bound(const _Kp& __x) const {
+ return __lower_bound<const_iterator>(*this, __x);
+ }
+
+ _LIBCPP_HIDE_FROM_ABI iterator upper_bound(const key_type& __x) { return __upper_bound<iterator>(*this, __x); }
+
+ _LIBCPP_HIDE_FROM_ABI const_iterator upper_bound(const key_type& __x) const {
+ return __upper_bound<const_iterator>(*this, __x);
+ }
+
+ template <class _Kp>
+ requires __is_compare_transparent
+ _LIBCPP_HIDE_FROM_ABI iterator upper_bound(const _Kp& __x) {
+ return __upper_bound<iterator>(*this, __x);
+ }
+
+ template <class _Kp>
+ requires __is_compare_transparent
+ _LIBCPP_HIDE_FROM_ABI const_iterator upper_bound(const _Kp& __x) const {
+ return __upper_bound<const_iterator>(*this, __x);
+ }
+
+ _LIBCPP_HIDE_FROM_ABI pair<iterator, iterator> equal_range(const key_type& __x) {
+ return __equal_range_impl(*this, __x);
+ }
+
+ _LIBCPP_HIDE_FROM_ABI pair<const_iterator, const_iterator> equal_range(const key_type& __x) const {
+ return __equal_range_impl(*this, __x);
+ }
+
+ template <class _Kp>
+ requires __is_compare_transparent
+ _LIBCPP_HIDE_FROM_ABI pair<iterator, iterator> equal_range(const _Kp& __x) {
+ return __equal_range_impl(*this, __x);
+ }
+ template <class _Kp>
+ requires __is_compare_transparent
+ _LIBCPP_HIDE_FROM_ABI pair<const_iterator, const_iterator> equal_range(const _Kp& __x) const {
+ return __equal_range_impl(*this, __x);
+ }
+
+ friend _LIBCPP_HIDE_FROM_ABI bool operator==(const flat_multimap& __x, const flat_multimap& __y) {
+ return ranges::equal(__x, __y);
+ }
+
+ friend _LIBCPP_HIDE_FROM_ABI auto operator<=>(const flat_multimap& __x, const flat_multimap& __y) {
+ return std::lexicographical_compare_three_way(
+ __x.begin(), __x.end(), __y.begin(), __y.end(), std::__synth_three_way);
+ }
+
+ friend _LIBCPP_HIDE_FROM_ABI void swap(flat_multimap& __x, flat_multimap& __y) noexcept { __x.swap(__y); }
+
+private:
+ struct __ctor_uses_allocator_tag {
+ explicit _LIBCPP_HIDE_FROM_ABI __ctor_uses_allocator_tag() = default;
+ };
+ struct __ctor_uses_allocator_empty_tag {
+ explicit _LIBCPP_HIDE_FROM_ABI __ctor_uses_allocator_empty_tag() = default;
+ };
+
+ template <class _Allocator, class _KeyCont, class _MappedCont, class... _CompArg>
+ requires __allocator_ctor_constraint<_Allocator>
+ _LIBCPP_HIDE_FROM_ABI
+ flat_multimap(__ctor_uses_allocator_tag,
+ const _Allocator& __alloc,
+ _KeyCont&& __key_cont,
+ _MappedCont&& __mapped_cont,
+ _CompArg&&... __comp)
+ : __containers_{.keys = std::make_obj_using_allocator<key_container_type>(
+ __alloc, std::forward<_KeyCont>(__key_cont)),
+ .values = std::make_obj_using_allocator<mapped_container_type>(
+ __alloc, std::forward<_MappedCont>(__mapped_cont))},
+ __compare_(std::forward<_CompArg>(__comp)...) {}
+
+ template <class _Allocator, class... _CompArg>
+ requires __allocator_ctor_constraint<_Allocator>
+ _LIBCPP_HIDE_FROM_ABI flat_multimap(__ctor_uses_allocator_empty_tag, const _Allocator& __alloc, _CompArg&&... __comp)
+ : __containers_{.keys = std::make_obj_using_allocator<key_container_type>(__alloc),
+ .values = std::make_obj_using_allocator<mapped_container_type>(__alloc)},
+ __compare_(std::forward<_CompArg>(__comp)...) {}
+
+ _LIBCPP_HIDE_FROM_ABI bool __is_sorted(auto&& __key_container) const {
+ return ranges::is_sorted(__key_container, __compare_);
+ }
+
+ _LIBCPP_HIDE_FROM_ABI void __sort() {
+ auto __zv = ranges::views::zip(__containers_.keys, __containers_.values);
+ ranges::stable_sort(__zv, __compare_, [](const auto& __p) -> decltype(auto) { return std::get<0>(__p); });
+ }
+
+ template <class _InputIterator, class _Sentinel>
+ _LIBCPP_HIDE_FROM_ABI size_type __append(_InputIterator __first, _Sentinel __last) {
+ size_type __num_of_appended = 0;
+ for (; __first != __last; ++__first) {
+ value_type __kv = *__first;
+ __containers_.keys.insert(__containers_.keys.end(), std::move(__kv.first));
+ __containers_.values.insert(__containers_.values.end(), std::move(__kv.second));
+ ++__num_of_appended;
+ }
+ return __num_of_appended;
+ }
+
+ template <bool _WasSorted, class _InputIterator, class _Sentinel>
+ _LIBCPP_HIDE_FROM_ABI void __append_sort_merge(_InputIterator __first, _Sentinel __last) {
+ auto __on_failure = std::__make_exception_guard([&]() noexcept { clear() /* noexcept */; });
+ size_t __num_of_appended = __append(std::move(__first), std::move(__last));
+ if (__num_of_appended != 0) {
+ auto __zv = ranges::views::zip(__containers_.keys, __containers_.values);
+ auto __append_start_offset = __containers_.keys.size() - __num_of_appended;
+ auto __end = __zv.end();
+ auto __compare_key = [this](const auto& __p1, const auto& __p2) {
+ return __compare_(std::get<0>(__p1), std::get<0>(__p2));
+ };
+ if constexpr (!_WasSorted) {
+ ranges::stable_sort(__zv.begin() + __append_start_offset, __end, __compare_key);
+ } else {
+ _LIBCPP_ASSERT_SEMANTIC_REQUIREMENT(
+ __is_sorted(__containers_.keys | ranges::views::drop(__append_start_offset)),
+ "Key container is not sorted");
+ }
+ ranges::inplace_merge(__zv.begin(), __zv.begin() + __append_start_offset, __end, __compare_key);
+ }
+ __on_failure.__complete();
+ }
+
+ template <class _Self, class _Kp>
+ _LIBCPP_HIDE_FROM_ABI static auto __find_impl(_Self&& __self, const _Kp& __key) {
+ auto __it = __self.lower_bound(__key);
+ auto __last = __self.end();
+ if (__it == __last || __self.__compare_(__key, __it->first)) {
+ return __last;
+ }
+ return __it;
+ }
+
+ template <class _Self, class _Kp>
+ _LIBCPP_HIDE_FROM_ABI static auto __equal_range_impl(_Self&& __self, const _Kp& __key) {
+ auto [__key_first, __key_last] = ranges::equal_range(__self.__containers_.keys, __key, __self.__compare_);
+
+ const auto __make_mapped_iter = [&](const auto& __key_iter) {
+ return __self.__containers_.values.begin() +
+ static_cast<ranges::range_difference_t<mapped_container_type>>(
+ ranges::distance(__self.__containers_.keys.begin(), __key_iter));
+ };
----------------
ldionne wrote:
This is actually the function we were discussing earlier, which computes the mapped iter corresponding to a key iter. This could be extracted and reused, potentially. And you have the same function in `flat_map`, in case you want to even consider generalizing it to that point.
https://github.com/llvm/llvm-project/pull/113835
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