intermediate changes

ref:cde9a383711a11544ce7e107a78147fb96cc4029

1 files changed, 932 insertions, 0 deletions

diff --git a/contrib/restricted/abseil-cpp-tstring/y_absl/container/internal/inlined_vector.h b/contrib/restricted/abseil-cpp-tstring/y_absl/container/internal/inlined_vector.h
new file mode 100644
index 00000000000..e6488e843e1
--- /dev/null
+++ b/contrib/restricted/abseil-cpp-tstring/y_absl/container/internal/inlined_vector.h
@@ -0,0 +1,932 @@
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_CONTAINER_INTERNAL_INLINED_VECTOR_INTERNAL_H_
+#define ABSL_CONTAINER_INTERNAL_INLINED_VECTOR_INTERNAL_H_
+
+#include <algorithm>
+#include <cstddef>
+#include <cstring>
+#include <iterator>
+#include <limits>
+#include <memory>
+#include <new>
+#include <type_traits>
+#include <utility>
+
+#include "y_absl/base/attributes.h"
+#include "y_absl/base/macros.h"
+#include "y_absl/container/internal/compressed_tuple.h"
+#include "y_absl/memory/memory.h"
+#include "y_absl/meta/type_traits.h"
+#include "y_absl/types/span.h"
+
+namespace y_absl {
+ABSL_NAMESPACE_BEGIN
+namespace inlined_vector_internal {
+
+// GCC does not deal very well with the below code
+#if !defined(__clang__) && defined(__GNUC__)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Warray-bounds"
+#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
+#endif
+
+template <typename A>
+using AllocatorTraits = std::allocator_traits<A>;
+template <typename A>
+using ValueType = typename AllocatorTraits<A>::value_type;
+template <typename A>
+using SizeType = typename AllocatorTraits<A>::size_type;
+template <typename A>
+using Pointer = typename AllocatorTraits<A>::pointer;
+template <typename A>
+using ConstPointer = typename AllocatorTraits<A>::const_pointer;
+template <typename A>
+using SizeType = typename AllocatorTraits<A>::size_type;
+template <typename A>
+using DifferenceType = typename AllocatorTraits<A>::difference_type;
+template <typename A>
+using Reference = ValueType<A>&;
+template <typename A>
+using ConstReference = const ValueType<A>&;
+template <typename A>
+using Iterator = Pointer<A>;
+template <typename A>
+using ConstIterator = ConstPointer<A>;
+template <typename A>
+using ReverseIterator = typename std::reverse_iterator<Iterator<A>>;
+template <typename A>
+using ConstReverseIterator = typename std::reverse_iterator<ConstIterator<A>>;
+template <typename A>
+using MoveIterator = typename std::move_iterator<Iterator<A>>;
+
+template <typename Iterator>
+using IsAtLeastForwardIterator = std::is_convertible<
+    typename std::iterator_traits<Iterator>::iterator_category,
+    std::forward_iterator_tag>;
+
+template <typename A>
+using IsMemcpyOk =
+    y_absl::conjunction<std::is_same<A, std::allocator<ValueType<A>>>,
+                      y_absl::is_trivially_copy_constructible<ValueType<A>>,
+                      y_absl::is_trivially_copy_assignable<ValueType<A>>,
+                      y_absl::is_trivially_destructible<ValueType<A>>>;
+
+template <typename T>
+struct TypeIdentity {
+  using type = T;
+};
+
+// Used for function arguments in template functions to prevent ADL by forcing
+// callers to explicitly specify the template parameter.
+template <typename T>
+using NoTypeDeduction = typename TypeIdentity<T>::type;
+
+template <typename A>
+void DestroyElements(NoTypeDeduction<A>& allocator, Pointer<A> destroy_first,
+                     SizeType<A> destroy_size) {
+  if (destroy_first != nullptr) {
+    for (SizeType<A> i = destroy_size; i != 0;) {
+      --i;
+      AllocatorTraits<A>::destroy(allocator, destroy_first + i);
+    }
+  }
+}
+
+template <typename A>
+struct Allocation {
+  Pointer<A> data;
+  SizeType<A> capacity;
+};
+
+template <typename A,
+          bool IsOverAligned =
+              (alignof(ValueType<A>) > ABSL_INTERNAL_DEFAULT_NEW_ALIGNMENT)>
+struct MallocAdapter {
+  static Allocation<A> Allocate(A& allocator, SizeType<A> requested_capacity) {
+    return {AllocatorTraits<A>::allocate(allocator, requested_capacity),
+            requested_capacity};
+  }
+
+  static void Deallocate(A& allocator, Pointer<A> pointer,
+                         SizeType<A> capacity) {
+    AllocatorTraits<A>::deallocate(allocator, pointer, capacity);
+  }
+};
+
+template <typename A, typename ValueAdapter>
+void ConstructElements(NoTypeDeduction<A>& allocator,
+                       Pointer<A> construct_first, ValueAdapter& values,
+                       SizeType<A> construct_size) {
+  for (SizeType<A> i = 0; i < construct_size; ++i) {
+    ABSL_INTERNAL_TRY { values.ConstructNext(allocator, construct_first + i); }
+    ABSL_INTERNAL_CATCH_ANY {
+      DestroyElements<A>(allocator, construct_first, i);
+      ABSL_INTERNAL_RETHROW;
+    }
+  }
+}
+
+template <typename A, typename ValueAdapter>
+void AssignElements(Pointer<A> assign_first, ValueAdapter& values,
+                    SizeType<A> assign_size) {
+  for (SizeType<A> i = 0; i < assign_size; ++i) {
+    values.AssignNext(assign_first + i);
+  }
+}
+
+template <typename A>
+struct StorageView {
+  Pointer<A> data;
+  SizeType<A> size;
+  SizeType<A> capacity;
+};
+
+template <typename A, typename Iterator>
+class IteratorValueAdapter {
+ public:
+  explicit IteratorValueAdapter(const Iterator& it) : it_(it) {}
+
+  void ConstructNext(A& allocator, Pointer<A> construct_at) {
+    AllocatorTraits<A>::construct(allocator, construct_at, *it_);
+    ++it_;
+  }
+
+  void AssignNext(Pointer<A> assign_at) {
+    *assign_at = *it_;
+    ++it_;
+  }
+
+ private:
+  Iterator it_;
+};
+
+template <typename A>
+class CopyValueAdapter {
+ public:
+  explicit CopyValueAdapter(ConstPointer<A> p) : ptr_(p) {}
+
+  void ConstructNext(A& allocator, Pointer<A> construct_at) {
+    AllocatorTraits<A>::construct(allocator, construct_at, *ptr_);
+  }
+
+  void AssignNext(Pointer<A> assign_at) { *assign_at = *ptr_; }
+
+ private:
+  ConstPointer<A> ptr_;
+};
+
+template <typename A>
+class DefaultValueAdapter {
+ public:
+  explicit DefaultValueAdapter() {}
+
+  void ConstructNext(A& allocator, Pointer<A> construct_at) {
+    AllocatorTraits<A>::construct(allocator, construct_at);
+  }
+
+  void AssignNext(Pointer<A> assign_at) { *assign_at = ValueType<A>(); }
+};
+
+template <typename A>
+class AllocationTransaction {
+ public:
+  explicit AllocationTransaction(A& allocator)
+      : allocator_data_(allocator, nullptr), capacity_(0) {}
+
+  ~AllocationTransaction() {
+    if (DidAllocate()) {
+      MallocAdapter<A>::Deallocate(GetAllocator(), GetData(), GetCapacity());
+    }
+  }
+
+  AllocationTransaction(const AllocationTransaction&) = delete;
+  void operator=(const AllocationTransaction&) = delete;
+
+  A& GetAllocator() { return allocator_data_.template get<0>(); }
+  Pointer<A>& GetData() { return allocator_data_.template get<1>(); }
+  SizeType<A>& GetCapacity() { return capacity_; }
+
+  bool DidAllocate() { return GetData() != nullptr; }
+
+  Pointer<A> Allocate(SizeType<A> requested_capacity) {
+    Allocation<A> result =
+        MallocAdapter<A>::Allocate(GetAllocator(), requested_capacity);
+    GetData() = result.data;
+    GetCapacity() = result.capacity;
+    return result.data;
+  }
+
+  ABSL_MUST_USE_RESULT Allocation<A> Release() && {
+    Allocation<A> result = {GetData(), GetCapacity()};
+    Reset();
+    return result;
+  }
+
+ private:
+  void Reset() {
+    GetData() = nullptr;
+    GetCapacity() = 0;
+  }
+
+  container_internal::CompressedTuple<A, Pointer<A>> allocator_data_;
+  SizeType<A> capacity_;
+};
+
+template <typename A>
+class ConstructionTransaction {
+ public:
+  explicit ConstructionTransaction(A& allocator)
+      : allocator_data_(allocator, nullptr), size_(0) {}
+
+  ~ConstructionTransaction() {
+    if (DidConstruct()) {
+      DestroyElements<A>(GetAllocator(), GetData(), GetSize());
+    }
+  }
+
+  ConstructionTransaction(const ConstructionTransaction&) = delete;
+  void operator=(const ConstructionTransaction&) = delete;
+
+  A& GetAllocator() { return allocator_data_.template get<0>(); }
+  Pointer<A>& GetData() { return allocator_data_.template get<1>(); }
+  SizeType<A>& GetSize() { return size_; }
+
+  bool DidConstruct() { return GetData() != nullptr; }
+  template <typename ValueAdapter>
+  void Construct(Pointer<A> data, ValueAdapter& values, SizeType<A> size) {
+    ConstructElements<A>(GetAllocator(), data, values, size);
+    GetData() = data;
+    GetSize() = size;
+  }
+  void Commit() && {
+    GetData() = nullptr;
+    GetSize() = 0;
+  }
+
+ private:
+  container_internal::CompressedTuple<A, Pointer<A>> allocator_data_;
+  SizeType<A> size_;
+};
+
+template <typename T, size_t N, typename A>
+class Storage {
+ public:
+  static SizeType<A> NextCapacity(SizeType<A> current_capacity) {
+    return current_capacity * 2;
+  }
+
+  static SizeType<A> ComputeCapacity(SizeType<A> current_capacity,
+                                     SizeType<A> requested_capacity) {
+    return (std::max)(NextCapacity(current_capacity), requested_capacity);
+  }
+
+  // ---------------------------------------------------------------------------
+  // Storage Constructors and Destructor
+  // ---------------------------------------------------------------------------
+
+  Storage() : metadata_(A(), /* size and is_allocated */ 0) {}
+
+  explicit Storage(const A& allocator)
+      : metadata_(allocator, /* size and is_allocated */ 0) {}
+
+  ~Storage() {
+    if (GetSizeAndIsAllocated() == 0) {
+      // Empty and not allocated; nothing to do.
+    } else if (IsMemcpyOk<A>::value) {
+      // No destructors need to be run; just deallocate if necessary.
+      DeallocateIfAllocated();
+    } else {
+      DestroyContents();
+    }
+  }
+
+  // ---------------------------------------------------------------------------
+  // Storage Member Accessors
+  // ---------------------------------------------------------------------------
+
+  SizeType<A>& GetSizeAndIsAllocated() { return metadata_.template get<1>(); }
+
+  const SizeType<A>& GetSizeAndIsAllocated() const {
+    return metadata_.template get<1>();
+  }
+
+  SizeType<A> GetSize() const { return GetSizeAndIsAllocated() >> 1; }
+
+  bool GetIsAllocated() const { return GetSizeAndIsAllocated() & 1; }
+
+  Pointer<A> GetAllocatedData() { return data_.allocated.allocated_data; }
+
+  ConstPointer<A> GetAllocatedData() const {
+    return data_.allocated.allocated_data;
+  }
+
+  Pointer<A> GetInlinedData() {
+    return reinterpret_cast<Pointer<A>>(
+        std::addressof(data_.inlined.inlined_data[0]));
+  }
+
+  ConstPointer<A> GetInlinedData() const {
+    return reinterpret_cast<ConstPointer<A>>(
+        std::addressof(data_.inlined.inlined_data[0]));
+  }
+
+  SizeType<A> GetAllocatedCapacity() const {
+    return data_.allocated.allocated_capacity;
+  }
+
+  SizeType<A> GetInlinedCapacity() const { return static_cast<SizeType<A>>(N); }
+
+  StorageView<A> MakeStorageView() {
+    return GetIsAllocated() ? StorageView<A>{GetAllocatedData(), GetSize(),
+                                             GetAllocatedCapacity()}
+                            : StorageView<A>{GetInlinedData(), GetSize(),
+                                             GetInlinedCapacity()};
+  }
+
+  A& GetAllocator() { return metadata_.template get<0>(); }
+
+  const A& GetAllocator() const { return metadata_.template get<0>(); }
+
+  // ---------------------------------------------------------------------------
+  // Storage Member Mutators
+  // ---------------------------------------------------------------------------
+
+  ABSL_ATTRIBUTE_NOINLINE void InitFrom(const Storage& other);
+
+  template <typename ValueAdapter>
+  void Initialize(ValueAdapter values, SizeType<A> new_size);
+
+  template <typename ValueAdapter>
+  void Assign(ValueAdapter values, SizeType<A> new_size);
+
+  template <typename ValueAdapter>
+  void Resize(ValueAdapter values, SizeType<A> new_size);
+
+  template <typename ValueAdapter>
+  Iterator<A> Insert(ConstIterator<A> pos, ValueAdapter values,
+                     SizeType<A> insert_count);
+
+  template <typename... Args>
+  Reference<A> EmplaceBack(Args&&... args);
+
+  Iterator<A> Erase(ConstIterator<A> from, ConstIterator<A> to);
+
+  void Reserve(SizeType<A> requested_capacity);
+
+  void ShrinkToFit();
+
+  void Swap(Storage* other_storage_ptr);
+
+  void SetIsAllocated() {
+    GetSizeAndIsAllocated() |= static_cast<SizeType<A>>(1);
+  }
+
+  void UnsetIsAllocated() {
+    GetSizeAndIsAllocated() &= ((std::numeric_limits<SizeType<A>>::max)() - 1);
+  }
+
+  void SetSize(SizeType<A> size) {
+    GetSizeAndIsAllocated() =
+        (size << 1) | static_cast<SizeType<A>>(GetIsAllocated());
+  }
+
+  void SetAllocatedSize(SizeType<A> size) {
+    GetSizeAndIsAllocated() = (size << 1) | static_cast<SizeType<A>>(1);
+  }
+
+  void SetInlinedSize(SizeType<A> size) {
+    GetSizeAndIsAllocated() = size << static_cast<SizeType<A>>(1);
+  }
+
+  void AddSize(SizeType<A> count) {
+    GetSizeAndIsAllocated() += count << static_cast<SizeType<A>>(1);
+  }
+
+  void SubtractSize(SizeType<A> count) {
+    assert(count <= GetSize());
+
+    GetSizeAndIsAllocated() -= count << static_cast<SizeType<A>>(1);
+  }
+
+  void SetAllocation(Allocation<A> allocation) {
+    data_.allocated.allocated_data = allocation.data;
+    data_.allocated.allocated_capacity = allocation.capacity;
+  }
+
+  void MemcpyFrom(const Storage& other_storage) {
+    assert(IsMemcpyOk<A>::value || other_storage.GetIsAllocated());
+
+    GetSizeAndIsAllocated() = other_storage.GetSizeAndIsAllocated();
+    data_ = other_storage.data_;
+  }
+
+  void DeallocateIfAllocated() {
+    if (GetIsAllocated()) {
+      MallocAdapter<A>::Deallocate(GetAllocator(), GetAllocatedData(),
+                                   GetAllocatedCapacity());
+    }
+  }
+
+ private:
+  ABSL_ATTRIBUTE_NOINLINE void DestroyContents();
+
+  using Metadata = container_internal::CompressedTuple<A, SizeType<A>>;
+
+  struct Allocated {
+    Pointer<A> allocated_data;
+    SizeType<A> allocated_capacity;
+  };
+
+  struct Inlined {
+    alignas(ValueType<A>) char inlined_data[sizeof(ValueType<A>[N])];
+  };
+
+  union Data {
+    Allocated allocated;
+    Inlined inlined;
+  };
+
+  template <typename... Args>
+  ABSL_ATTRIBUTE_NOINLINE Reference<A> EmplaceBackSlow(Args&&... args);
+
+  Metadata metadata_;
+  Data data_;
+};
+
+template <typename T, size_t N, typename A>
+void Storage<T, N, A>::DestroyContents() {
+  Pointer<A> data = GetIsAllocated() ? GetAllocatedData() : GetInlinedData();
+  DestroyElements<A>(GetAllocator(), data, GetSize());
+  DeallocateIfAllocated();
+}
+
+template <typename T, size_t N, typename A>
+void Storage<T, N, A>::InitFrom(const Storage& other) {
+  const SizeType<A> n = other.GetSize();
+  assert(n > 0);  // Empty sources handled handled in caller.
+  ConstPointer<A> src;
+  Pointer<A> dst;
+  if (!other.GetIsAllocated()) {
+    dst = GetInlinedData();
+    src = other.GetInlinedData();
+  } else {
+    // Because this is only called from the `InlinedVector` constructors, it's
+    // safe to take on the allocation with size `0`. If `ConstructElements(...)`
+    // throws, deallocation will be automatically handled by `~Storage()`.
+    SizeType<A> requested_capacity = ComputeCapacity(GetInlinedCapacity(), n);
+    Allocation<A> allocation =
+        MallocAdapter<A>::Allocate(GetAllocator(), requested_capacity);
+    SetAllocation(allocation);
+    dst = allocation.data;
+    src = other.GetAllocatedData();
+  }
+  if (IsMemcpyOk<A>::value) {
+    std::memcpy(reinterpret_cast<char*>(dst),
+                reinterpret_cast<const char*>(src), n * sizeof(ValueType<A>));
+  } else {
+    auto values = IteratorValueAdapter<A, ConstPointer<A>>(src);
+    ConstructElements<A>(GetAllocator(), dst, values, n);
+  }
+  GetSizeAndIsAllocated() = other.GetSizeAndIsAllocated();
+}
+
+template <typename T, size_t N, typename A>
+template <typename ValueAdapter>
+auto Storage<T, N, A>::Initialize(ValueAdapter values, SizeType<A> new_size)
+    -> void {
+  // Only callable from constructors!
+  assert(!GetIsAllocated());
+  assert(GetSize() == 0);
+
+  Pointer<A> construct_data;
+  if (new_size > GetInlinedCapacity()) {
+    // Because this is only called from the `InlinedVector` constructors, it's
+    // safe to take on the allocation with size `0`. If `ConstructElements(...)`
+    // throws, deallocation will be automatically handled by `~Storage()`.
+    SizeType<A> requested_capacity =
+        ComputeCapacity(GetInlinedCapacity(), new_size);
+    Allocation<A> allocation =
+        MallocAdapter<A>::Allocate(GetAllocator(), requested_capacity);
+    construct_data = allocation.data;
+    SetAllocation(allocation);
+    SetIsAllocated();
+  } else {
+    construct_data = GetInlinedData();
+  }
+
+  ConstructElements<A>(GetAllocator(), construct_data, values, new_size);
+
+  // Since the initial size was guaranteed to be `0` and the allocated bit is
+  // already correct for either case, *adding* `new_size` gives us the correct
+  // result faster than setting it directly.
+  AddSize(new_size);
+}
+
+template <typename T, size_t N, typename A>
+template <typename ValueAdapter>
+auto Storage<T, N, A>::Assign(ValueAdapter values, SizeType<A> new_size)
+    -> void {
+  StorageView<A> storage_view = MakeStorageView();
+
+  AllocationTransaction<A> allocation_tx(GetAllocator());
+
+  y_absl::Span<ValueType<A>> assign_loop;
+  y_absl::Span<ValueType<A>> construct_loop;
+  y_absl::Span<ValueType<A>> destroy_loop;
+
+  if (new_size > storage_view.capacity) {
+    SizeType<A> requested_capacity =
+        ComputeCapacity(storage_view.capacity, new_size);
+    construct_loop = {allocation_tx.Allocate(requested_capacity), new_size};
+    destroy_loop = {storage_view.data, storage_view.size};
+  } else if (new_size > storage_view.size) {
+    assign_loop = {storage_view.data, storage_view.size};
+    construct_loop = {storage_view.data + storage_view.size,
+                      new_size - storage_view.size};
+  } else {
+    assign_loop = {storage_view.data, new_size};
+    destroy_loop = {storage_view.data + new_size, storage_view.size - new_size};
+  }
+
+  AssignElements<A>(assign_loop.data(), values, assign_loop.size());
+
+  ConstructElements<A>(GetAllocator(), construct_loop.data(), values,
+                       construct_loop.size());
+
+  DestroyElements<A>(GetAllocator(), destroy_loop.data(), destroy_loop.size());
+
+  if (allocation_tx.DidAllocate()) {
+    DeallocateIfAllocated();
+    SetAllocation(std::move(allocation_tx).Release());
+    SetIsAllocated();
+  }
+
+  SetSize(new_size);
+}
+
+template <typename T, size_t N, typename A>
+template <typename ValueAdapter>
+auto Storage<T, N, A>::Resize(ValueAdapter values, SizeType<A> new_size)
+    -> void {
+  StorageView<A> storage_view = MakeStorageView();
+  Pointer<A> const base = storage_view.data;
+  const SizeType<A> size = storage_view.size;
+  A& alloc = GetAllocator();
+  if (new_size <= size) {
+    // Destroy extra old elements.
+    DestroyElements<A>(alloc, base + new_size, size - new_size);
+  } else if (new_size <= storage_view.capacity) {
+    // Construct new elements in place.
+    ConstructElements<A>(alloc, base + size, values, new_size - size);
+  } else {
+    // Steps:
+    //  a. Allocate new backing store.
+    //  b. Construct new elements in new backing store.
+    //  c. Move existing elements from old backing store to now.
+    //  d. Destroy all elements in old backing store.
+    // Use transactional wrappers for the first two steps so we can roll
+    // back if necessary due to exceptions.
+    AllocationTransaction<A> allocation_tx(alloc);
+    SizeType<A> requested_capacity =
+        ComputeCapacity(storage_view.capacity, new_size);
+    Pointer<A> new_data = allocation_tx.Allocate(requested_capacity);
+
+    ConstructionTransaction<A> construction_tx(alloc);
+    construction_tx.Construct(new_data + size, values, new_size - size);
+
+    IteratorValueAdapter<A, MoveIterator<A>> move_values(
+        (MoveIterator<A>(base)));
+    ConstructElements<A>(alloc, new_data, move_values, size);
+
+    DestroyElements<A>(alloc, base, size);
+    std::move(construction_tx).Commit();
+    DeallocateIfAllocated();
+    SetAllocation(std::move(allocation_tx).Release());
+    SetIsAllocated();
+  }
+  SetSize(new_size);
+}
+
+template <typename T, size_t N, typename A>
+template <typename ValueAdapter>
+auto Storage<T, N, A>::Insert(ConstIterator<A> pos, ValueAdapter values,
+                              SizeType<A> insert_count) -> Iterator<A> {
+  StorageView<A> storage_view = MakeStorageView();
+
+  SizeType<A> insert_index =
+      std::distance(ConstIterator<A>(storage_view.data), pos);
+  SizeType<A> insert_end_index = insert_index + insert_count;
+  SizeType<A> new_size = storage_view.size + insert_count;
+
+  if (new_size > storage_view.capacity) {
+    AllocationTransaction<A> allocation_tx(GetAllocator());
+    ConstructionTransaction<A> construction_tx(GetAllocator());
+    ConstructionTransaction<A> move_construction_tx(GetAllocator());
+
+    IteratorValueAdapter<A, MoveIterator<A>> move_values(
+        MoveIterator<A>(storage_view.data));
+
+    SizeType<A> requested_capacity =
+        ComputeCapacity(storage_view.capacity, new_size);
+    Pointer<A> new_data = allocation_tx.Allocate(requested_capacity);
+
+    construction_tx.Construct(new_data + insert_index, values, insert_count);
+
+    move_construction_tx.Construct(new_data, move_values, insert_index);
+
+    ConstructElements<A>(GetAllocator(), new_data + insert_end_index,
+                         move_values, storage_view.size - insert_index);
+
+    DestroyElements<A>(GetAllocator(), storage_view.data, storage_view.size);
+
+    std::move(construction_tx).Commit();
+    std::move(move_construction_tx).Commit();
+    DeallocateIfAllocated();
+    SetAllocation(std::move(allocation_tx).Release());
+
+    SetAllocatedSize(new_size);
+    return Iterator<A>(new_data + insert_index);
+  } else {
+    SizeType<A> move_construction_destination_index =
+        (std::max)(insert_end_index, storage_view.size);
+
+    ConstructionTransaction<A> move_construction_tx(GetAllocator());
+
+    IteratorValueAdapter<A, MoveIterator<A>> move_construction_values(
+        MoveIterator<A>(storage_view.data +
+                        (move_construction_destination_index - insert_count)));
+    y_absl::Span<ValueType<A>> move_construction = {
+        storage_view.data + move_construction_destination_index,
+        new_size - move_construction_destination_index};
+
+    Pointer<A> move_assignment_values = storage_view.data + insert_index;
+    y_absl::Span<ValueType<A>> move_assignment = {
+        storage_view.data + insert_end_index,
+        move_construction_destination_index - insert_end_index};
+
+    y_absl::Span<ValueType<A>> insert_assignment = {move_assignment_values,
+                                                  move_construction.size()};
+
+    y_absl::Span<ValueType<A>> insert_construction = {
+        insert_assignment.data() + insert_assignment.size(),
+        insert_count - insert_assignment.size()};
+
+    move_construction_tx.Construct(move_construction.data(),
+                                   move_construction_values,
+                                   move_construction.size());
+
+    for (Pointer<A>
+             destination = move_assignment.data() + move_assignment.size(),
+             last_destination = move_assignment.data(),
+             source = move_assignment_values + move_assignment.size();
+         ;) {
+      --destination;
+      --source;
+      if (destination < last_destination) break;
+      *destination = std::move(*source);
+    }
+
+    AssignElements<A>(insert_assignment.data(), values,
+                      insert_assignment.size());
+
+    ConstructElements<A>(GetAllocator(), insert_construction.data(), values,
+                         insert_construction.size());
+
+    std::move(move_construction_tx).Commit();
+
+    AddSize(insert_count);
+    return Iterator<A>(storage_view.data + insert_index);
+  }
+}
+
+template <typename T, size_t N, typename A>
+template <typename... Args>
+auto Storage<T, N, A>::EmplaceBack(Args&&... args) -> Reference<A> {
+  StorageView<A> storage_view = MakeStorageView();
+  const SizeType<A> n = storage_view.size;
+  if (ABSL_PREDICT_TRUE(n != storage_view.capacity)) {
+    // Fast path; new element fits.
+    Pointer<A> last_ptr = storage_view.data + n;
+    AllocatorTraits<A>::construct(GetAllocator(), last_ptr,
+                                  std::forward<Args>(args)...);
+    AddSize(1);
+    return *last_ptr;
+  }
+  // TODO(b/173712035): Annotate with musttail attribute to prevent regression.
+  return EmplaceBackSlow(std::forward<Args>(args)...);
+}
+
+template <typename T, size_t N, typename A>
+template <typename... Args>
+auto Storage<T, N, A>::EmplaceBackSlow(Args&&... args) -> Reference<A> {
+  StorageView<A> storage_view = MakeStorageView();
+  AllocationTransaction<A> allocation_tx(GetAllocator());
+  IteratorValueAdapter<A, MoveIterator<A>> move_values(
+      MoveIterator<A>(storage_view.data));
+  SizeType<A> requested_capacity = NextCapacity(storage_view.capacity);
+  Pointer<A> construct_data = allocation_tx.Allocate(requested_capacity);
+  Pointer<A> last_ptr = construct_data + storage_view.size;
+
+  // Construct new element.
+  AllocatorTraits<A>::construct(GetAllocator(), last_ptr,
+                                std::forward<Args>(args)...);
+  // Move elements from old backing store to new backing store.
+  ABSL_INTERNAL_TRY {
+    ConstructElements<A>(GetAllocator(), allocation_tx.GetData(), move_values,
+                         storage_view.size);
+  }
+  ABSL_INTERNAL_CATCH_ANY {
+    AllocatorTraits<A>::destroy(GetAllocator(), last_ptr);
+    ABSL_INTERNAL_RETHROW;
+  }
+  // Destroy elements in old backing store.
+  DestroyElements<A>(GetAllocator(), storage_view.data, storage_view.size);
+
+  DeallocateIfAllocated();
+  SetAllocation(std::move(allocation_tx).Release());
+  SetIsAllocated();
+  AddSize(1);
+  return *last_ptr;
+}
+
+template <typename T, size_t N, typename A>
+auto Storage<T, N, A>::Erase(ConstIterator<A> from, ConstIterator<A> to)
+    -> Iterator<A> {
+  StorageView<A> storage_view = MakeStorageView();
+
+  SizeType<A> erase_size = std::distance(from, to);
+  SizeType<A> erase_index =
+      std::distance(ConstIterator<A>(storage_view.data), from);
+  SizeType<A> erase_end_index = erase_index + erase_size;
+
+  IteratorValueAdapter<A, MoveIterator<A>> move_values(
+      MoveIterator<A>(storage_view.data + erase_end_index));
+
+  AssignElements<A>(storage_view.data + erase_index, move_values,
+                    storage_view.size - erase_end_index);
+
+  DestroyElements<A>(GetAllocator(),
+                     storage_view.data + (storage_view.size - erase_size),
+                     erase_size);
+
+  SubtractSize(erase_size);
+  return Iterator<A>(storage_view.data + erase_index);
+}
+
+template <typename T, size_t N, typename A>
+auto Storage<T, N, A>::Reserve(SizeType<A> requested_capacity) -> void {
+  StorageView<A> storage_view = MakeStorageView();
+
+  if (ABSL_PREDICT_FALSE(requested_capacity <= storage_view.capacity)) return;
+
+  AllocationTransaction<A> allocation_tx(GetAllocator());
+
+  IteratorValueAdapter<A, MoveIterator<A>> move_values(
+      MoveIterator<A>(storage_view.data));
+
+  SizeType<A> new_requested_capacity =
+      ComputeCapacity(storage_view.capacity, requested_capacity);
+  Pointer<A> new_data = allocation_tx.Allocate(new_requested_capacity);
+
+  ConstructElements<A>(GetAllocator(), new_data, move_values,
+                       storage_view.size);
+
+  DestroyElements<A>(GetAllocator(), storage_view.data, storage_view.size);
+
+  DeallocateIfAllocated();
+  SetAllocation(std::move(allocation_tx).Release());
+  SetIsAllocated();
+}
+
+template <typename T, size_t N, typename A>
+auto Storage<T, N, A>::ShrinkToFit() -> void {
+  // May only be called on allocated instances!
+  assert(GetIsAllocated());
+
+  StorageView<A> storage_view{GetAllocatedData(), GetSize(),
+                              GetAllocatedCapacity()};
+
+  if (ABSL_PREDICT_FALSE(storage_view.size == storage_view.capacity)) return;
+
+  AllocationTransaction<A> allocation_tx(GetAllocator());
+
+  IteratorValueAdapter<A, MoveIterator<A>> move_values(
+      MoveIterator<A>(storage_view.data));
+
+  Pointer<A> construct_data;
+  if (storage_view.size > GetInlinedCapacity()) {
+    SizeType<A> requested_capacity = storage_view.size;
+    construct_data = allocation_tx.Allocate(requested_capacity);
+    if (allocation_tx.GetCapacity() >= storage_view.capacity) {
+      // Already using the smallest available heap allocation.
+      return;
+    }
+  } else {
+    construct_data = GetInlinedData();
+  }
+
+  ABSL_INTERNAL_TRY {
+    ConstructElements<A>(GetAllocator(), construct_data, move_values,
+                         storage_view.size);
+  }
+  ABSL_INTERNAL_CATCH_ANY {
+    SetAllocation({storage_view.data, storage_view.capacity});
+    ABSL_INTERNAL_RETHROW;
+  }
+
+  DestroyElements<A>(GetAllocator(), storage_view.data, storage_view.size);
+
+  MallocAdapter<A>::Deallocate(GetAllocator(), storage_view.data,
+                               storage_view.capacity);
+
+  if (allocation_tx.DidAllocate()) {
+    SetAllocation(std::move(allocation_tx).Release());
+  } else {
+    UnsetIsAllocated();
+  }
+}
+
+template <typename T, size_t N, typename A>
+auto Storage<T, N, A>::Swap(Storage* other_storage_ptr) -> void {
+  using std::swap;
+  assert(this != other_storage_ptr);
+
+  if (GetIsAllocated() && other_storage_ptr->GetIsAllocated()) {
+    swap(data_.allocated, other_storage_ptr->data_.allocated);
+  } else if (!GetIsAllocated() && !other_storage_ptr->GetIsAllocated()) {
+    Storage* small_ptr = this;
+    Storage* large_ptr = other_storage_ptr;
+    if (small_ptr->GetSize() > large_ptr->GetSize()) swap(small_ptr, large_ptr);
+
+    for (SizeType<A> i = 0; i < small_ptr->GetSize(); ++i) {
+      swap(small_ptr->GetInlinedData()[i], large_ptr->GetInlinedData()[i]);
+    }
+
+    IteratorValueAdapter<A, MoveIterator<A>> move_values(
+        MoveIterator<A>(large_ptr->GetInlinedData() + small_ptr->GetSize()));
+
+    ConstructElements<A>(large_ptr->GetAllocator(),
+                         small_ptr->GetInlinedData() + small_ptr->GetSize(),
+                         move_values,
+                         large_ptr->GetSize() - small_ptr->GetSize());
+
+    DestroyElements<A>(large_ptr->GetAllocator(),
+                       large_ptr->GetInlinedData() + small_ptr->GetSize(),
+                       large_ptr->GetSize() - small_ptr->GetSize());
+  } else {
+    Storage* allocated_ptr = this;
+    Storage* inlined_ptr = other_storage_ptr;
+    if (!allocated_ptr->GetIsAllocated()) swap(allocated_ptr, inlined_ptr);
+
+    StorageView<A> allocated_storage_view{
+        allocated_ptr->GetAllocatedData(), allocated_ptr->GetSize(),
+        allocated_ptr->GetAllocatedCapacity()};
+
+    IteratorValueAdapter<A, MoveIterator<A>> move_values(
+        MoveIterator<A>(inlined_ptr->GetInlinedData()));
+
+    ABSL_INTERNAL_TRY {
+      ConstructElements<A>(inlined_ptr->GetAllocator(),
+                           allocated_ptr->GetInlinedData(), move_values,
+                           inlined_ptr->GetSize());
+    }
+    ABSL_INTERNAL_CATCH_ANY {
+      allocated_ptr->SetAllocation(
+          Allocation<A>{allocated_storage_view.data, allocated_storage_view.capacity});
+      ABSL_INTERNAL_RETHROW;
+    }
+
+    DestroyElements<A>(inlined_ptr->GetAllocator(),
+                       inlined_ptr->GetInlinedData(), inlined_ptr->GetSize());
+
+    inlined_ptr->SetAllocation(
+        Allocation<A>{allocated_storage_view.data, allocated_storage_view.capacity});
+  }
+
+  swap(GetSizeAndIsAllocated(), other_storage_ptr->GetSizeAndIsAllocated());
+  swap(GetAllocator(), other_storage_ptr->GetAllocator());
+}
+
+// End ignore "array-bounds" and "maybe-uninitialized"
+#if !defined(__clang__) && defined(__GNUC__)
+#pragma GCC diagnostic pop
+#endif
+
+}  // namespace inlined_vector_internal
+ABSL_NAMESPACE_END
+}  // namespace y_absl
+
+#endif  // ABSL_CONTAINER_INTERNAL_INLINED_VECTOR_INTERNAL_H_