1369 lines
39 KiB
C++
1369 lines
39 KiB
C++
/*
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* Copyright 2017-present Facebook, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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/**
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* F14NodeMap, F14ValueMap, and F14VectorMap
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*
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* F14FastMap conditionally inherits from F14ValueMap or F14VectorMap
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*
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* See F14.md
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*
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* @author Nathan Bronson <ngbronson@fb.com>
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* @author Xiao Shi <xshi@fb.com>
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*/
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#include <stdexcept>
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#include <folly/Traits.h>
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#include <folly/functional/ApplyTuple.h>
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#include <folly/lang/Exception.h>
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#include <folly/lang/SafeAssert.h>
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#include <folly/container/F14Map-fwd.h>
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#include <folly/container/detail/F14Policy.h>
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#include <folly/container/detail/F14Table.h>
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#if !FOLLY_F14_VECTOR_INTRINSICS_AVAILABLE
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//////// Compatibility for unsupported platforms (not x86_64 and not aarch64)
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#include <string>
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#include <unordered_map>
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namespace folly {
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namespace f14 {
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namespace detail {
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template <typename K, typename M, typename H, typename E, typename A>
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class F14BasicMap : public std::unordered_map<K, M, H, E, A> {
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using Super = std::unordered_map<K, M, H, E, A>;
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public:
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using typename Super::pointer;
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using typename Super::value_type;
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F14BasicMap() = default;
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using Super::Super;
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//// PUBLIC - F14 Extensions
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// exact for libstdc++, approximate for others
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std::size_t getAllocatedMemorySize() const {
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std::size_t rv = 0;
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visitAllocationClasses(
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[&](std::size_t bytes, std::size_t n) { rv += bytes * n; });
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return rv;
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}
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// exact for libstdc++, approximate for others
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template <typename V>
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void visitAllocationClasses(V&& visitor) const {
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auto bc = this->bucket_count();
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if (bc > 1) {
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visitor(bc * sizeof(pointer), 1);
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}
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if (this->size() > 0) {
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visitor(sizeof(StdNodeReplica<K, value_type, H>), this->size());
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}
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}
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template <typename V>
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void visitContiguousRanges(V&& visitor) const {
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for (value_type const& entry : *this) {
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value_type const* b = std::addressof(entry);
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visitor(b, b + 1);
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}
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}
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};
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} // namespace detail
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} // namespace f14
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template <
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typename Key,
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typename Mapped,
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typename Hasher,
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typename KeyEqual,
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typename Alloc>
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class F14ValueMap
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: public f14::detail::F14BasicMap<Key, Mapped, Hasher, KeyEqual, Alloc> {
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using Super = f14::detail::F14BasicMap<Key, Mapped, Hasher, KeyEqual, Alloc>;
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public:
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using typename Super::value_type;
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F14ValueMap() = default;
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using Super::Super;
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F14ValueMap& operator=(std::initializer_list<value_type> ilist) {
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Super::operator=(ilist);
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return *this;
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}
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};
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template <
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typename Key,
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typename Mapped,
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typename Hasher,
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typename KeyEqual,
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typename Alloc>
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class F14NodeMap
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: public f14::detail::F14BasicMap<Key, Mapped, Hasher, KeyEqual, Alloc> {
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using Super = f14::detail::F14BasicMap<Key, Mapped, Hasher, KeyEqual, Alloc>;
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public:
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using typename Super::value_type;
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F14NodeMap() = default;
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using Super::Super;
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F14NodeMap& operator=(std::initializer_list<value_type> ilist) {
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Super::operator=(ilist);
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return *this;
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}
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};
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template <
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typename Key,
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typename Mapped,
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typename Hasher,
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typename KeyEqual,
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typename Alloc>
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class F14VectorMap
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: public f14::detail::F14BasicMap<Key, Mapped, Hasher, KeyEqual, Alloc> {
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using Super = f14::detail::F14BasicMap<Key, Mapped, Hasher, KeyEqual, Alloc>;
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public:
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using typename Super::value_type;
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F14VectorMap() = default;
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using Super::Super;
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F14VectorMap& operator=(std::initializer_list<value_type> ilist) {
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Super::operator=(ilist);
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return *this;
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}
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};
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} // namespace folly
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#else // FOLLY_F14_VECTOR_INTRINSICS_AVAILABLE
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//////// Common case for supported platforms
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namespace folly {
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namespace f14 {
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namespace detail {
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template <typename Policy>
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class F14BasicMap {
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template <typename K, typename T>
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using EnableHeterogeneousFind = std::enable_if_t<
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EligibleForHeterogeneousFind<
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typename Policy::Key,
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typename Policy::Hasher,
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typename Policy::KeyEqual,
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K>::value,
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T>;
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template <typename K, typename T>
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using EnableHeterogeneousInsert = std::enable_if_t<
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EligibleForHeterogeneousInsert<
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typename Policy::Key,
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typename Policy::Hasher,
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typename Policy::KeyEqual,
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K>::value,
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T>;
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template <typename K, typename T>
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using EnableHeterogeneousErase = std::enable_if_t<
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EligibleForHeterogeneousFind<
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typename Policy::Value,
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typename Policy::Hasher,
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typename Policy::KeyEqual,
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K>::value &&
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!std::is_same<typename Policy::Iter, remove_cvref_t<K>>::value &&
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!std::is_same<typename Policy::ConstIter, remove_cvref_t<K>>::value,
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T>;
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public:
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//// PUBLIC - Member types
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using key_type = typename Policy::Key;
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using mapped_type = typename Policy::Mapped;
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using value_type = typename Policy::Value;
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using size_type = std::size_t;
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using difference_type = std::ptrdiff_t;
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using hasher = typename Policy::Hasher;
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using key_equal = typename Policy::KeyEqual;
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using allocator_type = typename Policy::Alloc;
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using reference = value_type&;
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using const_reference = value_type const&;
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using pointer = typename Policy::AllocTraits::pointer;
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using const_pointer = typename Policy::AllocTraits::const_pointer;
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using iterator = typename Policy::Iter;
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using const_iterator = typename Policy::ConstIter;
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private:
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using ItemIter = typename Policy::ItemIter;
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public:
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//// PUBLIC - Member functions
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F14BasicMap() noexcept(Policy::kDefaultConstructIsNoexcept)
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: F14BasicMap(0) {}
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explicit F14BasicMap(
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std::size_t initialCapacity,
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hasher const& hash = hasher{},
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key_equal const& eq = key_equal{},
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allocator_type const& alloc = allocator_type{})
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: table_{initialCapacity, hash, eq, alloc} {}
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explicit F14BasicMap(std::size_t initialCapacity, allocator_type const& alloc)
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: F14BasicMap(initialCapacity, hasher{}, key_equal{}, alloc) {}
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explicit F14BasicMap(
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std::size_t initialCapacity,
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hasher const& hash,
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allocator_type const& alloc)
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: F14BasicMap(initialCapacity, hash, key_equal{}, alloc) {}
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explicit F14BasicMap(allocator_type const& alloc)
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: F14BasicMap(0, hasher{}, key_equal{}, alloc) {}
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template <typename InputIt>
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F14BasicMap(
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InputIt first,
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InputIt last,
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std::size_t initialCapacity = 0,
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hasher const& hash = hasher{},
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key_equal const& eq = key_equal{},
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allocator_type const& alloc = allocator_type{})
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: table_{initialCapacity, hash, eq, alloc} {
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initialInsert(first, last, initialCapacity);
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}
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template <typename InputIt>
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F14BasicMap(
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InputIt first,
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InputIt last,
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std::size_t initialCapacity,
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allocator_type const& alloc)
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: table_{initialCapacity, hasher{}, key_equal{}, alloc} {
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initialInsert(first, last, initialCapacity);
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}
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template <typename InputIt>
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F14BasicMap(
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InputIt first,
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InputIt last,
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std::size_t initialCapacity,
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hasher const& hash,
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allocator_type const& alloc)
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: table_{initialCapacity, hash, key_equal{}, alloc} {
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initialInsert(first, last, initialCapacity);
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}
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F14BasicMap(F14BasicMap const& rhs) = default;
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F14BasicMap(F14BasicMap const& rhs, allocator_type const& alloc)
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: table_{rhs.table_, alloc} {}
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F14BasicMap(F14BasicMap&& rhs) = default;
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F14BasicMap(F14BasicMap&& rhs, allocator_type const& alloc) noexcept(
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Policy::kAllocIsAlwaysEqual)
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: table_{std::move(rhs.table_), alloc} {}
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F14BasicMap(
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std::initializer_list<value_type> init,
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std::size_t initialCapacity = 0,
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hasher const& hash = hasher{},
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key_equal const& eq = key_equal{},
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allocator_type const& alloc = allocator_type{})
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: table_{initialCapacity, hash, eq, alloc} {
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initialInsert(init.begin(), init.end(), initialCapacity);
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}
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F14BasicMap(
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std::initializer_list<value_type> init,
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std::size_t initialCapacity,
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allocator_type const& alloc)
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: table_{initialCapacity, hasher{}, key_equal{}, alloc} {
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initialInsert(init.begin(), init.end(), initialCapacity);
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}
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F14BasicMap(
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std::initializer_list<value_type> init,
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std::size_t initialCapacity,
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hasher const& hash,
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allocator_type const& alloc)
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: table_{initialCapacity, hash, key_equal{}, alloc} {
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initialInsert(init.begin(), init.end(), initialCapacity);
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}
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F14BasicMap& operator=(F14BasicMap const&) = default;
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F14BasicMap& operator=(F14BasicMap&&) = default;
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F14BasicMap& operator=(std::initializer_list<value_type> ilist) {
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clear();
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bulkInsert(ilist.begin(), ilist.end(), false);
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return *this;
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}
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allocator_type get_allocator() const noexcept {
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return table_.alloc();
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}
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//// PUBLIC - Iterators
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iterator begin() noexcept {
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return table_.makeIter(table_.begin());
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}
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const_iterator begin() const noexcept {
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return cbegin();
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}
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const_iterator cbegin() const noexcept {
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return table_.makeConstIter(table_.begin());
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}
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iterator end() noexcept {
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return table_.makeIter(table_.end());
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}
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const_iterator end() const noexcept {
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return cend();
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}
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const_iterator cend() const noexcept {
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return table_.makeConstIter(table_.end());
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}
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//// PUBLIC - Capacity
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bool empty() const noexcept {
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return table_.empty();
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}
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std::size_t size() const noexcept {
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return table_.size();
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}
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std::size_t max_size() const noexcept {
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return table_.max_size();
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}
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//// PUBLIC - Modifiers
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void clear() noexcept {
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table_.clear();
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}
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std::pair<iterator, bool> insert(value_type const& value) {
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return emplace(value);
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}
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template <typename P>
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std::enable_if_t<
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std::is_constructible<value_type, P&&>::value,
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std::pair<iterator, bool>>
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insert(P&& value) {
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return emplace(std::forward<P>(value));
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}
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// TODO(T31574848): Work around libstdc++ versions (e.g., GCC < 6) with no
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// implementation of N4387 ("perfect initialization" for pairs and tuples).
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template <typename U1, typename U2>
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std::enable_if_t<
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std::is_constructible<key_type, U1 const&>::value &&
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std::is_constructible<mapped_type, U2 const&>::value,
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std::pair<iterator, bool>>
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insert(std::pair<U1, U2> const& value) {
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return emplace(value);
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}
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// TODO(T31574848)
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template <typename U1, typename U2>
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std::enable_if_t<
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std::is_constructible<key_type, U1&&>::value &&
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std::is_constructible<mapped_type, U2&&>::value,
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std::pair<iterator, bool>>
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insert(std::pair<U1, U2>&& value) {
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return emplace(std::move(value));
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}
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std::pair<iterator, bool> insert(value_type&& value) {
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return emplace(std::move(value));
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}
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// std::unordered_map's hinted insertion API is misleading. No
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// implementation I've seen actually uses the hint. Code restructuring
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// by the caller to use the hinted API is at best unnecessary, and at
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// worst a pessimization. It is used, however, so we provide it.
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iterator insert(const_iterator /*hint*/, value_type const& value) {
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return insert(value).first;
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}
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template <typename P>
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std::enable_if_t<std::is_constructible<value_type, P&&>::value, iterator>
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insert(const_iterator /*hint*/, P&& value) {
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return insert(std::forward<P>(value)).first;
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}
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iterator insert(const_iterator /*hint*/, value_type&& value) {
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return insert(std::move(value)).first;
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}
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template <class... Args>
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iterator emplace_hint(const_iterator /*hint*/, Args&&... args) {
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return emplace(std::forward<Args>(args)...).first;
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}
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private:
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template <class InputIt>
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FOLLY_ALWAYS_INLINE void
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bulkInsert(InputIt first, InputIt last, bool autoReserve) {
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if (autoReserve) {
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table_.reserveForInsert(std::distance(first, last));
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}
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while (first != last) {
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insert(*first);
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++first;
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}
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}
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template <class InputIt>
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void initialInsert(InputIt first, InputIt last, std::size_t initialCapacity) {
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FOLLY_SAFE_DCHECK(empty() && bucket_count() >= initialCapacity, "");
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// It's possible that there are a lot of duplicates in first..last and
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// so we will oversize ourself. The common case, however, is that
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// we can avoid a lot of rehashing if we pre-expand. The behavior
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// is easy to disable at a particular call site by asking for an
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// initialCapacity of 1.
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bool autoReserve =
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std::is_same<
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typename std::iterator_traits<InputIt>::iterator_category,
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std::random_access_iterator_tag>::value &&
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initialCapacity == 0;
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bulkInsert(first, last, autoReserve);
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}
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public:
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template <class InputIt>
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void insert(InputIt first, InputIt last) {
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// Bulk reserve is a heuristic choice, so it can backfire. We restrict
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// ourself to situations that mimic bulk construction without an
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// explicit initialCapacity.
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bool autoReserve =
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std::is_same<
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typename std::iterator_traits<InputIt>::iterator_category,
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std::random_access_iterator_tag>::value &&
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bucket_count() == 0;
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bulkInsert(first, last, autoReserve);
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}
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void insert(std::initializer_list<value_type> ilist) {
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insert(ilist.begin(), ilist.end());
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}
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template <typename M>
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std::pair<iterator, bool> insert_or_assign(key_type const& key, M&& obj) {
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auto rv = try_emplace(key, std::forward<M>(obj));
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if (!rv.second) {
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rv.first->second = std::forward<M>(obj);
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}
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return rv;
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}
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template <typename M>
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std::pair<iterator, bool> insert_or_assign(key_type&& key, M&& obj) {
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auto rv = try_emplace(std::move(key), std::forward<M>(obj));
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if (!rv.second) {
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rv.first->second = std::forward<M>(obj);
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}
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return rv;
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}
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template <typename M>
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iterator
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insert_or_assign(const_iterator /*hint*/, key_type const& key, M&& obj) {
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return insert_or_assign(key, std::move(obj)).first;
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}
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template <typename M>
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iterator insert_or_assign(const_iterator /*hint*/, key_type&& key, M&& obj) {
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return insert_or_assign(std::move(key), std::move(obj)).first;
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}
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template <typename K, typename M>
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EnableHeterogeneousInsert<K, std::pair<iterator, bool>> insert_or_assign(
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K&& key,
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M&& obj) {
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auto rv = try_emplace(std::forward<K>(key), std::forward<M>(obj));
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if (!rv.second) {
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rv.first->second = std::forward<M>(obj);
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}
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return rv;
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}
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private:
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std::pair<ItemIter, bool> emplaceItem() {
|
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// rare but valid
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return table_.tryEmplaceValue(key_type{});
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}
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template <typename U1, typename U2>
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std::pair<ItemIter, bool> emplaceItem(U1&& x, U2&& y) {
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using K = KeyTypeForEmplace<key_type, hasher, key_equal, U1>;
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K key(std::forward<U1>(x));
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// TODO(T31574848): piecewise_construct is to work around libstdc++ versions
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|
// (e.g., GCC < 6) with no implementation of N4387 ("perfect initialization"
|
|
// for pairs and tuples). Otherwise we could just pass key, forwarded key,
|
|
// and forwarded y to tryEmplaceValue.
|
|
return table_.tryEmplaceValue(
|
|
key,
|
|
std::piecewise_construct,
|
|
std::forward_as_tuple(std::forward<K>(key)),
|
|
std::forward_as_tuple(std::forward<U2>(y)));
|
|
}
|
|
|
|
template <typename U1, typename U2>
|
|
std::pair<ItemIter, bool> emplaceItem(std::pair<U1, U2> const& p) {
|
|
return emplaceItem(p.first, p.second);
|
|
}
|
|
|
|
template <typename U1, typename U2>
|
|
std::pair<ItemIter, bool> emplaceItem(std::pair<U1, U2>&& p) {
|
|
return emplaceItem(std::move(p.first), std::move(p.second));
|
|
}
|
|
|
|
template <typename Arg1, typename... Args2>
|
|
std::pair<ItemIter, bool> emplaceItem(
|
|
std::piecewise_construct_t,
|
|
std::tuple<Arg1>&& first_args,
|
|
std::tuple<Args2...>&& second_args) {
|
|
using K = KeyTypeForEmplace<key_type, hasher, key_equal, Arg1>;
|
|
K key(std::get<0>(std::move(first_args)));
|
|
|
|
// Args2&&... holds only references even if the caller gave us a
|
|
// tuple that directly contains values.
|
|
return table_.tryEmplaceValue(
|
|
key,
|
|
std::piecewise_construct,
|
|
std::forward_as_tuple(std::forward<K>(key)),
|
|
std::tuple<Args2&&...>(std::move(second_args)));
|
|
}
|
|
|
|
template <typename... Args1, typename... Args2>
|
|
std::enable_if_t<sizeof...(Args1) != 1, std::pair<ItemIter, bool>>
|
|
emplaceItem(
|
|
std::piecewise_construct_t,
|
|
std::tuple<Args1...>&& first_args,
|
|
std::tuple<Args2...>&& second_args) {
|
|
auto key = make_from_tuple<key_type>(
|
|
std::tuple<Args1&&...>(std::move(first_args)));
|
|
return table_.tryEmplaceValue(
|
|
key,
|
|
std::piecewise_construct,
|
|
std::forward_as_tuple(std::move(key)),
|
|
std::tuple<Args2&&...>(std::move(second_args)));
|
|
}
|
|
|
|
public:
|
|
template <typename... Args>
|
|
std::pair<iterator, bool> emplace(Args&&... args) {
|
|
auto rv = emplaceItem(std::forward<Args>(args)...);
|
|
return std::make_pair(table_.makeIter(rv.first), rv.second);
|
|
}
|
|
|
|
template <typename... Args>
|
|
std::pair<iterator, bool> try_emplace(key_type const& key, Args&&... args) {
|
|
auto rv = table_.tryEmplaceValue(
|
|
key,
|
|
std::piecewise_construct,
|
|
std::forward_as_tuple(key),
|
|
std::forward_as_tuple(std::forward<Args>(args)...));
|
|
return std::make_pair(table_.makeIter(rv.first), rv.second);
|
|
}
|
|
|
|
template <typename... Args>
|
|
std::pair<iterator, bool> try_emplace(key_type&& key, Args&&... args) {
|
|
auto rv = table_.tryEmplaceValue(
|
|
key,
|
|
std::piecewise_construct,
|
|
std::forward_as_tuple(std::move(key)),
|
|
std::forward_as_tuple(std::forward<Args>(args)...));
|
|
return std::make_pair(table_.makeIter(rv.first), rv.second);
|
|
}
|
|
|
|
template <typename... Args>
|
|
iterator
|
|
try_emplace(const_iterator /*hint*/, key_type const& key, Args&&... args) {
|
|
auto rv = table_.tryEmplaceValue(
|
|
key,
|
|
std::piecewise_construct,
|
|
std::forward_as_tuple(key),
|
|
std::forward_as_tuple(std::forward<Args>(args)...));
|
|
return table_.makeIter(rv.first);
|
|
}
|
|
|
|
template <typename... Args>
|
|
iterator
|
|
try_emplace(const_iterator /*hint*/, key_type&& key, Args&&... args) {
|
|
auto rv = table_.tryEmplaceValue(
|
|
key,
|
|
std::piecewise_construct,
|
|
std::forward_as_tuple(std::move(key)),
|
|
std::forward_as_tuple(std::forward<Args>(args)...));
|
|
return table_.makeIter(rv.first);
|
|
}
|
|
|
|
template <typename K, typename... Args>
|
|
EnableHeterogeneousInsert<K, std::pair<iterator, bool>> try_emplace(
|
|
K&& key,
|
|
Args&&... args) {
|
|
auto rv = table_.tryEmplaceValue(
|
|
key,
|
|
std::piecewise_construct,
|
|
std::forward_as_tuple(std::forward<K>(key)),
|
|
std::forward_as_tuple(std::forward<Args>(args)...));
|
|
return std::make_pair(table_.makeIter(rv.first), rv.second);
|
|
}
|
|
|
|
FOLLY_ALWAYS_INLINE iterator erase(const_iterator pos) {
|
|
// If we are inlined then gcc and clang can optimize away all of the
|
|
// work of itemPos.advance() if our return value is discarded.
|
|
auto itemPos = table_.unwrapIter(pos);
|
|
table_.eraseIter(itemPos);
|
|
itemPos.advanceLikelyDead();
|
|
return table_.makeIter(itemPos);
|
|
}
|
|
|
|
// This form avoids ambiguity when key_type has a templated constructor
|
|
// that accepts const_iterator
|
|
iterator erase(iterator pos) {
|
|
auto itemPos = table_.unwrapIter(pos);
|
|
table_.eraseIter(itemPos);
|
|
itemPos.advanceLikelyDead();
|
|
return table_.makeIter(itemPos);
|
|
}
|
|
|
|
iterator erase(const_iterator first, const_iterator last) {
|
|
auto itemFirst = table_.unwrapIter(first);
|
|
auto itemLast = table_.unwrapIter(last);
|
|
while (itemFirst != itemLast) {
|
|
table_.eraseIter(itemFirst);
|
|
itemFirst.advance();
|
|
}
|
|
return table_.makeIter(itemFirst);
|
|
}
|
|
|
|
size_type erase(key_type const& key) {
|
|
return table_.eraseKey(key);
|
|
}
|
|
|
|
template <typename K>
|
|
EnableHeterogeneousErase<K, size_type> erase(K const& key) {
|
|
return table_.eraseKey(key);
|
|
}
|
|
|
|
//// PUBLIC - Lookup
|
|
|
|
FOLLY_ALWAYS_INLINE mapped_type& at(key_type const& key) {
|
|
return at(*this, key);
|
|
}
|
|
|
|
FOLLY_ALWAYS_INLINE mapped_type const& at(key_type const& key) const {
|
|
return at(*this, key);
|
|
}
|
|
|
|
template <typename K>
|
|
EnableHeterogeneousFind<K, mapped_type&> at(K const& key) {
|
|
return at(*this, key);
|
|
}
|
|
|
|
template <typename K>
|
|
EnableHeterogeneousFind<K, mapped_type const&> at(K const& key) const {
|
|
return at(*this, key);
|
|
}
|
|
|
|
mapped_type& operator[](key_type const& key) {
|
|
return try_emplace(key).first->second;
|
|
}
|
|
|
|
mapped_type& operator[](key_type&& key) {
|
|
return try_emplace(std::move(key)).first->second;
|
|
}
|
|
|
|
template <typename K>
|
|
EnableHeterogeneousInsert<K, mapped_type&> operator[](K&& key) {
|
|
return try_emplace(std::forward<K>(key)).first->second;
|
|
}
|
|
|
|
FOLLY_ALWAYS_INLINE std::size_t count(key_type const& key) const {
|
|
return table_.find(key).atEnd() ? 0 : 1;
|
|
}
|
|
|
|
template <typename K>
|
|
FOLLY_ALWAYS_INLINE EnableHeterogeneousFind<K, std::size_t> count(
|
|
K const& key) const {
|
|
return table_.find(key).atEnd() ? 0 : 1;
|
|
}
|
|
|
|
// prehash(key) does the work of evaluating hash_function()(key)
|
|
// (including additional bit-mixing for non-avalanching hash functions),
|
|
// wraps the result of that work in a token for later reuse, and
|
|
// begins prefetching the first steps of looking for key into the
|
|
// local CPU cache.
|
|
//
|
|
// The returned token may be used at any time, may be used more than
|
|
// once, and may be used in other F14 sets and maps. Tokens are
|
|
// transferrable between any F14 containers (maps and sets) with the
|
|
// same key_type and equal hash_function()s.
|
|
//
|
|
// Hash tokens are not hints -- it is a bug to call any method on this
|
|
// class with a token t and key k where t isn't the result of a call
|
|
// to prehash(k2) with k2 == k.
|
|
F14HashToken prehash(key_type const& key) const {
|
|
return table_.prehash(key);
|
|
}
|
|
|
|
template <typename K>
|
|
EnableHeterogeneousFind<K, F14HashToken> prehash(K const& key) const {
|
|
return table_.prehash(key);
|
|
}
|
|
|
|
FOLLY_ALWAYS_INLINE iterator find(key_type const& key) {
|
|
return table_.makeIter(table_.find(key));
|
|
}
|
|
|
|
FOLLY_ALWAYS_INLINE const_iterator find(key_type const& key) const {
|
|
return table_.makeConstIter(table_.find(key));
|
|
}
|
|
|
|
FOLLY_ALWAYS_INLINE iterator
|
|
find(F14HashToken const& token, key_type const& key) {
|
|
return table_.makeIter(table_.find(token, key));
|
|
}
|
|
|
|
FOLLY_ALWAYS_INLINE const_iterator
|
|
find(F14HashToken const& token, key_type const& key) const {
|
|
return table_.makeConstIter(table_.find(token, key));
|
|
}
|
|
|
|
template <typename K>
|
|
FOLLY_ALWAYS_INLINE EnableHeterogeneousFind<K, iterator> find(K const& key) {
|
|
return table_.makeIter(table_.find(key));
|
|
}
|
|
|
|
template <typename K>
|
|
FOLLY_ALWAYS_INLINE EnableHeterogeneousFind<K, const_iterator> find(
|
|
K const& key) const {
|
|
return table_.makeConstIter(table_.find(key));
|
|
}
|
|
|
|
template <typename K>
|
|
FOLLY_ALWAYS_INLINE EnableHeterogeneousFind<K, iterator> find(
|
|
F14HashToken const& token,
|
|
K const& key) {
|
|
return table_.makeIter(table_.find(token, key));
|
|
}
|
|
|
|
template <typename K>
|
|
FOLLY_ALWAYS_INLINE EnableHeterogeneousFind<K, const_iterator> find(
|
|
F14HashToken const& token,
|
|
K const& key) const {
|
|
return table_.makeConstIter(table_.find(token, key));
|
|
}
|
|
|
|
std::pair<iterator, iterator> equal_range(key_type const& key) {
|
|
return equal_range(*this, key);
|
|
}
|
|
|
|
std::pair<const_iterator, const_iterator> equal_range(
|
|
key_type const& key) const {
|
|
return equal_range(*this, key);
|
|
}
|
|
|
|
template <typename K>
|
|
EnableHeterogeneousFind<K, std::pair<iterator, iterator>> equal_range(
|
|
K const& key) {
|
|
return equal_range(*this, key);
|
|
}
|
|
|
|
template <typename K>
|
|
EnableHeterogeneousFind<K, std::pair<const_iterator, const_iterator>>
|
|
equal_range(K const& key) const {
|
|
return equal_range(*this, key);
|
|
}
|
|
|
|
//// PUBLIC - Bucket interface
|
|
|
|
std::size_t bucket_count() const noexcept {
|
|
return table_.bucket_count();
|
|
}
|
|
|
|
std::size_t max_bucket_count() const noexcept {
|
|
return table_.max_bucket_count();
|
|
}
|
|
|
|
//// PUBLIC - Hash policy
|
|
|
|
float load_factor() const noexcept {
|
|
return table_.load_factor();
|
|
}
|
|
|
|
float max_load_factor() const noexcept {
|
|
return table_.max_load_factor();
|
|
}
|
|
|
|
void max_load_factor(float v) {
|
|
table_.max_load_factor(v);
|
|
}
|
|
|
|
void rehash(std::size_t bucketCapacity) {
|
|
// The standard's rehash() requires understanding the max load factor,
|
|
// which is easy to get wrong. Since we don't actually allow adjustment
|
|
// of max_load_factor there is no difference.
|
|
reserve(bucketCapacity);
|
|
}
|
|
|
|
void reserve(std::size_t capacity) {
|
|
table_.reserve(capacity);
|
|
}
|
|
|
|
//// PUBLIC - Observers
|
|
|
|
hasher hash_function() const {
|
|
return table_.hasher();
|
|
}
|
|
|
|
key_equal key_eq() const {
|
|
return table_.keyEqual();
|
|
}
|
|
|
|
//// PUBLIC - F14 Extensions
|
|
|
|
// Get memory footprint, not including sizeof(*this).
|
|
std::size_t getAllocatedMemorySize() const {
|
|
return table_.getAllocatedMemorySize();
|
|
}
|
|
|
|
// Enumerates classes of allocated memory blocks currently owned
|
|
// by this table, calling visitor(allocationSize, allocationCount).
|
|
// This can be used to get a more accurate indication of memory footprint
|
|
// than getAllocatedMemorySize() if you have some way of computing the
|
|
// internal fragmentation of the allocator, such as JEMalloc's nallocx.
|
|
// The visitor might be called twice with the same allocationSize. The
|
|
// visitor's computation should produce the same result for visitor(8,
|
|
// 2) as for two calls to visitor(8, 1), for example. The visitor may
|
|
// be called with a zero allocationCount.
|
|
template <typename V>
|
|
void visitAllocationClasses(V&& visitor) const {
|
|
return table_.visitAllocationClasses(visitor);
|
|
}
|
|
|
|
// Calls visitor with two value_type const*, b and e, such that every
|
|
// entry in the table is included in exactly one of the ranges [b,e).
|
|
// This can be used to efficiently iterate elements in bulk when crossing
|
|
// an API boundary that supports contiguous blocks of items.
|
|
template <typename V>
|
|
void visitContiguousRanges(V&& visitor) const;
|
|
|
|
F14TableStats computeStats() const noexcept {
|
|
return table_.computeStats();
|
|
}
|
|
|
|
private:
|
|
template <typename Self, typename K>
|
|
FOLLY_ALWAYS_INLINE static auto& at(Self& self, K const& key) {
|
|
auto iter = self.find(key);
|
|
if (iter == self.end()) {
|
|
throw_exception<std::out_of_range>("at() did not find key");
|
|
}
|
|
return iter->second;
|
|
}
|
|
|
|
template <typename Self, typename K>
|
|
static auto equal_range(Self& self, K const& key) {
|
|
auto first = self.find(key);
|
|
auto last = first;
|
|
if (last != self.end()) {
|
|
++last;
|
|
}
|
|
return std::make_pair(first, last);
|
|
}
|
|
|
|
protected:
|
|
F14Table<Policy> table_;
|
|
};
|
|
|
|
template <typename M>
|
|
bool mapsEqual(M const& lhs, M const& rhs) {
|
|
if (lhs.size() != rhs.size()) {
|
|
return false;
|
|
}
|
|
for (auto& kv : lhs) {
|
|
auto iter = rhs.find(kv.first);
|
|
if (iter == rhs.end()) {
|
|
return false;
|
|
}
|
|
if (std::is_same<
|
|
typename M::key_equal,
|
|
std::equal_to<typename M::key_type>>::value) {
|
|
// find already checked key, just check value
|
|
if (!(kv.second == iter->second)) {
|
|
return false;
|
|
}
|
|
} else {
|
|
// spec says we compare key with == as well as with key_eq()
|
|
if (!(kv == *iter)) {
|
|
return false;
|
|
}
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
} // namespace detail
|
|
} // namespace f14
|
|
|
|
template <
|
|
typename Key,
|
|
typename Mapped,
|
|
typename Hasher,
|
|
typename KeyEqual,
|
|
typename Alloc>
|
|
class F14ValueMap
|
|
: public f14::detail::F14BasicMap<f14::detail::MapPolicyWithDefaults<
|
|
f14::detail::ValueContainerPolicy,
|
|
Key,
|
|
Mapped,
|
|
Hasher,
|
|
KeyEqual,
|
|
Alloc>> {
|
|
using Policy = f14::detail::MapPolicyWithDefaults<
|
|
f14::detail::ValueContainerPolicy,
|
|
Key,
|
|
Mapped,
|
|
Hasher,
|
|
KeyEqual,
|
|
Alloc>;
|
|
using Super = f14::detail::F14BasicMap<Policy>;
|
|
|
|
public:
|
|
using typename Super::value_type;
|
|
|
|
F14ValueMap() = default;
|
|
|
|
using Super::Super;
|
|
|
|
F14ValueMap& operator=(std::initializer_list<value_type> ilist) {
|
|
Super::operator=(ilist);
|
|
return *this;
|
|
}
|
|
|
|
void swap(F14ValueMap& rhs) noexcept(Policy::kSwapIsNoexcept) {
|
|
this->table_.swap(rhs.table_);
|
|
}
|
|
|
|
template <typename V>
|
|
void visitContiguousRanges(V&& visitor) const {
|
|
this->table_.visitContiguousItemRanges(visitor);
|
|
}
|
|
};
|
|
|
|
template <typename K, typename M, typename H, typename E, typename A>
|
|
bool operator==(
|
|
F14ValueMap<K, M, H, E, A> const& lhs,
|
|
F14ValueMap<K, M, H, E, A> const& rhs) {
|
|
return mapsEqual(lhs, rhs);
|
|
}
|
|
|
|
template <typename K, typename M, typename H, typename E, typename A>
|
|
bool operator!=(
|
|
F14ValueMap<K, M, H, E, A> const& lhs,
|
|
F14ValueMap<K, M, H, E, A> const& rhs) {
|
|
return !(lhs == rhs);
|
|
}
|
|
|
|
template <
|
|
typename Key,
|
|
typename Mapped,
|
|
typename Hasher,
|
|
typename KeyEqual,
|
|
typename Alloc>
|
|
class F14NodeMap
|
|
: public f14::detail::F14BasicMap<f14::detail::MapPolicyWithDefaults<
|
|
f14::detail::NodeContainerPolicy,
|
|
Key,
|
|
Mapped,
|
|
Hasher,
|
|
KeyEqual,
|
|
Alloc>> {
|
|
using Policy = f14::detail::MapPolicyWithDefaults<
|
|
f14::detail::NodeContainerPolicy,
|
|
Key,
|
|
Mapped,
|
|
Hasher,
|
|
KeyEqual,
|
|
Alloc>;
|
|
using Super = f14::detail::F14BasicMap<Policy>;
|
|
|
|
public:
|
|
using typename Super::value_type;
|
|
|
|
F14NodeMap() = default;
|
|
|
|
using Super::Super;
|
|
|
|
F14NodeMap& operator=(std::initializer_list<value_type> ilist) {
|
|
Super::operator=(ilist);
|
|
return *this;
|
|
}
|
|
|
|
void swap(F14NodeMap& rhs) noexcept(Policy::kSwapIsNoexcept) {
|
|
this->table_.swap(rhs.table_);
|
|
}
|
|
|
|
template <typename V>
|
|
void visitContiguousRanges(V&& visitor) const {
|
|
this->table_.visitItems([&](typename Policy::Item ptr) {
|
|
value_type const* b = std::addressof(*ptr);
|
|
visitor(b, b + 1);
|
|
});
|
|
}
|
|
|
|
// TODO extract and node_handle insert
|
|
};
|
|
|
|
template <typename K, typename M, typename H, typename E, typename A>
|
|
bool operator==(
|
|
F14NodeMap<K, M, H, E, A> const& lhs,
|
|
F14NodeMap<K, M, H, E, A> const& rhs) {
|
|
return mapsEqual(lhs, rhs);
|
|
}
|
|
|
|
template <typename K, typename M, typename H, typename E, typename A>
|
|
bool operator!=(
|
|
F14NodeMap<K, M, H, E, A> const& lhs,
|
|
F14NodeMap<K, M, H, E, A> const& rhs) {
|
|
return !(lhs == rhs);
|
|
}
|
|
|
|
template <
|
|
typename Key,
|
|
typename Mapped,
|
|
typename Hasher,
|
|
typename KeyEqual,
|
|
typename Alloc>
|
|
class F14VectorMap
|
|
: public f14::detail::F14BasicMap<f14::detail::MapPolicyWithDefaults<
|
|
f14::detail::VectorContainerPolicy,
|
|
Key,
|
|
Mapped,
|
|
Hasher,
|
|
KeyEqual,
|
|
Alloc>> {
|
|
using Policy = f14::detail::MapPolicyWithDefaults<
|
|
f14::detail::VectorContainerPolicy,
|
|
Key,
|
|
Mapped,
|
|
Hasher,
|
|
KeyEqual,
|
|
Alloc>;
|
|
using Super = f14::detail::F14BasicMap<Policy>;
|
|
|
|
template <typename K, typename T>
|
|
using EnableHeterogeneousVectorErase = std::enable_if_t<
|
|
f14::detail::EligibleForHeterogeneousFind<
|
|
typename Policy::Value,
|
|
typename Policy::Hasher,
|
|
typename Policy::KeyEqual,
|
|
K>::value &&
|
|
!std::is_same<typename Policy::Iter, remove_cvref_t<K>>::value &&
|
|
!std::is_same<typename Policy::ConstIter, remove_cvref_t<K>>::value &&
|
|
!std::is_same<typename Policy::ReverseIter, remove_cvref_t<K>>::
|
|
value &&
|
|
!std::is_same<typename Policy::ConstReverseIter, remove_cvref_t<K>>::
|
|
value,
|
|
T>;
|
|
|
|
public:
|
|
using typename Super::const_iterator;
|
|
using typename Super::iterator;
|
|
using typename Super::key_type;
|
|
using typename Super::value_type;
|
|
using reverse_iterator = typename Policy::ReverseIter;
|
|
using const_reverse_iterator = typename Policy::ConstReverseIter;
|
|
|
|
F14VectorMap() = default;
|
|
|
|
// inherit constructors
|
|
using Super::Super;
|
|
|
|
F14VectorMap& operator=(std::initializer_list<value_type> ilist) {
|
|
Super::operator=(ilist);
|
|
return *this;
|
|
}
|
|
|
|
void swap(F14VectorMap& rhs) noexcept(Policy::kSwapIsNoexcept) {
|
|
this->table_.swap(rhs.table_);
|
|
}
|
|
|
|
// ITERATION ORDER
|
|
//
|
|
// Deterministic iteration order for insert-only workloads is part of
|
|
// F14VectorMap's supported API: iterator is LIFO and reverse_iterator
|
|
// is FIFO.
|
|
//
|
|
// If there have been no calls to erase() then iterator and
|
|
// const_iterator enumerate entries in the opposite of insertion order.
|
|
// begin()->first is the key most recently inserted. reverse_iterator
|
|
// and reverse_const_iterator, therefore, enumerate in LIFO (insertion)
|
|
// order for insert-only workloads. Deterministic iteration order is
|
|
// only guaranteed if no keys were removed since the last time the
|
|
// map was empty. Iteration order is preserved across rehashes and
|
|
// F14VectorMap copies and moves.
|
|
//
|
|
// iterator uses LIFO order so that erasing while iterating with begin()
|
|
// and end() is safe using the erase(it++) idiom, which is supported
|
|
// by std::map and std::unordered_map. erase(iter) invalidates iter
|
|
// and all iterators before iter in the non-reverse iteration order.
|
|
// Every successful erase invalidates all reverse iterators.
|
|
|
|
iterator begin() {
|
|
return this->table_.linearBegin(this->size());
|
|
}
|
|
const_iterator begin() const {
|
|
return cbegin();
|
|
}
|
|
const_iterator cbegin() const {
|
|
return this->table_.linearBegin(this->size());
|
|
}
|
|
|
|
iterator end() {
|
|
return this->table_.linearEnd();
|
|
}
|
|
const_iterator end() const {
|
|
return cend();
|
|
}
|
|
const_iterator cend() const {
|
|
return this->table_.linearEnd();
|
|
}
|
|
|
|
reverse_iterator rbegin() {
|
|
return this->table_.values_;
|
|
}
|
|
const_reverse_iterator rbegin() const {
|
|
return crbegin();
|
|
}
|
|
const_reverse_iterator crbegin() const {
|
|
return this->table_.values_;
|
|
}
|
|
|
|
reverse_iterator rend() {
|
|
return this->table_.values_ + this->table_.size();
|
|
}
|
|
const_reverse_iterator rend() const {
|
|
return crend();
|
|
}
|
|
const_reverse_iterator crend() const {
|
|
return this->table_.values_ + this->table_.size();
|
|
}
|
|
|
|
// explicit conversions between iterator and reverse_iterator
|
|
iterator iter(reverse_iterator riter) {
|
|
return this->table_.iter(riter);
|
|
}
|
|
const_iterator iter(const_reverse_iterator riter) const {
|
|
return this->table_.iter(riter);
|
|
}
|
|
|
|
reverse_iterator riter(iterator it) {
|
|
return this->table_.riter(it);
|
|
}
|
|
const_reverse_iterator riter(const_iterator it) const {
|
|
return this->table_.riter(it);
|
|
}
|
|
|
|
private:
|
|
void eraseUnderlying(typename Policy::ItemIter underlying) {
|
|
Alloc& a = this->table_.alloc();
|
|
auto values = this->table_.values_;
|
|
|
|
// Remove the ptr from the base table and destroy the value.
|
|
auto index = underlying.item();
|
|
// The item still needs to be hashable during this call, so we must destroy
|
|
// the value _afterwards_.
|
|
this->table_.eraseIter(underlying);
|
|
Policy::AllocTraits::destroy(a, std::addressof(values[index]));
|
|
|
|
// move the last element in values_ down and fix up the inbound index
|
|
auto tailIndex = this->size();
|
|
if (tailIndex != index) {
|
|
auto tail = this->table_.find(f14::detail::VectorContainerIndexSearch{
|
|
static_cast<uint32_t>(tailIndex)});
|
|
tail.item() = index;
|
|
auto p = std::addressof(values[index]);
|
|
assume(p != nullptr);
|
|
this->table_.transfer(a, std::addressof(values[tailIndex]), p, 1);
|
|
}
|
|
}
|
|
|
|
template <typename K>
|
|
std::size_t eraseUnderlyingKey(K const& key) {
|
|
auto underlying = this->table_.find(key);
|
|
if (underlying.atEnd()) {
|
|
return 0;
|
|
} else {
|
|
eraseUnderlying(underlying);
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
public:
|
|
FOLLY_ALWAYS_INLINE iterator erase(const_iterator pos) {
|
|
auto index = this->table_.iterToIndex(pos);
|
|
auto underlying =
|
|
this->table_.find(f14::detail::VectorContainerIndexSearch{index});
|
|
eraseUnderlying(underlying);
|
|
return index == 0 ? end() : this->table_.indexToIter(index - 1);
|
|
}
|
|
|
|
// This form avoids ambiguity when key_type has a templated constructor
|
|
// that accepts const_iterator
|
|
FOLLY_ALWAYS_INLINE iterator erase(iterator pos) {
|
|
const_iterator cpos{pos};
|
|
return erase(cpos);
|
|
}
|
|
|
|
iterator erase(const_iterator first, const_iterator last) {
|
|
while (first != last) {
|
|
first = erase(first);
|
|
}
|
|
auto index = this->table_.iterToIndex(first);
|
|
return index == 0 ? end() : this->table_.indexToIter(index - 1);
|
|
}
|
|
|
|
// No erase is provided for reverse_iterator or const_reverse_iterator
|
|
// to make it harder to shoot yourself in the foot by erasing while
|
|
// reverse-iterating. You can write that as map.erase(map.iter(riter)).
|
|
|
|
std::size_t erase(key_type const& key) {
|
|
return eraseUnderlyingKey(key);
|
|
}
|
|
|
|
template <typename K>
|
|
EnableHeterogeneousVectorErase<K, std::size_t> erase(K const& key) {
|
|
return eraseUnderlyingKey(key);
|
|
}
|
|
|
|
template <typename V>
|
|
void visitContiguousRanges(V&& visitor) const {
|
|
auto n = this->table_.size();
|
|
if (n > 0) {
|
|
value_type const* b = std::addressof(this->table_.values_[0]);
|
|
visitor(b, b + n);
|
|
}
|
|
}
|
|
};
|
|
|
|
template <typename K, typename M, typename H, typename E, typename A>
|
|
bool operator==(
|
|
F14VectorMap<K, M, H, E, A> const& lhs,
|
|
F14VectorMap<K, M, H, E, A> const& rhs) {
|
|
return mapsEqual(lhs, rhs);
|
|
}
|
|
|
|
template <typename K, typename M, typename H, typename E, typename A>
|
|
bool operator!=(
|
|
F14VectorMap<K, M, H, E, A> const& lhs,
|
|
F14VectorMap<K, M, H, E, A> const& rhs) {
|
|
return !(lhs == rhs);
|
|
}
|
|
|
|
} // namespace folly
|
|
|
|
#endif // FOLLY_F14_VECTOR_INTRINSICS_AVAILABLE
|
|
|
|
namespace folly {
|
|
|
|
template <
|
|
typename Key,
|
|
typename Mapped,
|
|
typename Hasher,
|
|
typename KeyEqual,
|
|
typename Alloc>
|
|
class F14FastMap : public std::conditional_t<
|
|
sizeof(std::pair<Key const, Mapped>) < 24,
|
|
F14ValueMap<Key, Mapped, Hasher, KeyEqual, Alloc>,
|
|
F14VectorMap<Key, Mapped, Hasher, KeyEqual, Alloc>> {
|
|
using Super = std::conditional_t<
|
|
sizeof(std::pair<Key const, Mapped>) < 24,
|
|
F14ValueMap<Key, Mapped, Hasher, KeyEqual, Alloc>,
|
|
F14VectorMap<Key, Mapped, Hasher, KeyEqual, Alloc>>;
|
|
|
|
public:
|
|
using typename Super::value_type;
|
|
|
|
F14FastMap() = default;
|
|
|
|
using Super::Super;
|
|
|
|
F14FastMap& operator=(std::initializer_list<value_type> ilist) {
|
|
Super::operator=(ilist);
|
|
return *this;
|
|
}
|
|
};
|
|
|
|
template <typename K, typename M, typename H, typename E, typename A>
|
|
void swap(
|
|
F14ValueMap<K, M, H, E, A>& lhs,
|
|
F14ValueMap<K, M, H, E, A>& rhs) noexcept(noexcept(lhs.swap(rhs))) {
|
|
lhs.swap(rhs);
|
|
}
|
|
|
|
template <typename K, typename M, typename H, typename E, typename A>
|
|
void swap(
|
|
F14NodeMap<K, M, H, E, A>& lhs,
|
|
F14NodeMap<K, M, H, E, A>& rhs) noexcept(noexcept(lhs.swap(rhs))) {
|
|
lhs.swap(rhs);
|
|
}
|
|
|
|
template <typename K, typename M, typename H, typename E, typename A>
|
|
void swap(
|
|
F14VectorMap<K, M, H, E, A>& lhs,
|
|
F14VectorMap<K, M, H, E, A>& rhs) noexcept(noexcept(lhs.swap(rhs))) {
|
|
lhs.swap(rhs);
|
|
}
|
|
|
|
template <typename K, typename M, typename H, typename E, typename A>
|
|
void swap(
|
|
F14FastMap<K, M, H, E, A>& lhs,
|
|
F14FastMap<K, M, H, E, A>& rhs) noexcept(noexcept(lhs.swap(rhs))) {
|
|
lhs.swap(rhs);
|
|
}
|
|
|
|
} // namespace folly
|