mirror of
https://github.com/SerenityOS/serenity
synced 2024-07-21 10:05:32 +00:00
295eec2d49
Previously, Vector::extend for a moved vector would move the other vector into this vector if this vector was empty, thereby throwing away existing allocated capacity. Therefore, this commit allows the move to only happen if this vector's capacity is too small to fit the other vector. This will also alleviate bugs where callers relied on the capacity to never shrink with calls to unchecked_append, extend and the like.
768 lines
21 KiB
C++
768 lines
21 KiB
C++
/*
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* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
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* Copyright (c) 2021, the SerenityOS developers.
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/Assertions.h>
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#include <AK/Error.h>
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#include <AK/Find.h>
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#include <AK/Forward.h>
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#include <AK/Iterator.h>
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#include <AK/Optional.h>
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#include <AK/Span.h>
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#include <AK/StdLibExtras.h>
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#include <AK/Traits.h>
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#include <AK/TypedTransfer.h>
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#include <AK/kmalloc.h>
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#include <initializer_list>
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namespace AK {
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namespace Detail {
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template<typename StorageType, bool>
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struct CanBePlacedInsideVectorHelper;
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template<typename StorageType>
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struct CanBePlacedInsideVectorHelper<StorageType, true> {
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template<typename U>
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static constexpr bool value = requires(U&& u) { StorageType { &u }; };
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};
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template<typename StorageType>
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struct CanBePlacedInsideVectorHelper<StorageType, false> {
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template<typename U>
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static constexpr bool value = requires(U&& u) { StorageType(forward<U>(u)); };
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};
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}
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template<typename T, size_t inline_capacity>
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requires(!IsRvalueReference<T>) class Vector {
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private:
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static constexpr bool contains_reference = IsLvalueReference<T>;
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using StorageType = Conditional<contains_reference, RawPtr<RemoveReference<T>>, T>;
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template<typename U>
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static constexpr bool CanBePlacedInsideVector = Detail::CanBePlacedInsideVectorHelper<StorageType, contains_reference>::template value<U>;
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public:
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using ValueType = T;
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Vector()
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: m_capacity(inline_capacity)
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{
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}
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Vector(std::initializer_list<T> list) requires(!IsLvalueReference<T>)
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{
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ensure_capacity(list.size());
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for (auto& item : list)
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unchecked_append(item);
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}
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Vector(Vector&& other)
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: m_size(other.m_size)
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, m_capacity(other.m_capacity)
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, m_outline_buffer(other.m_outline_buffer)
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{
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if constexpr (inline_capacity > 0) {
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if (!m_outline_buffer) {
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for (size_t i = 0; i < m_size; ++i) {
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new (&inline_buffer()[i]) StorageType(move(other.inline_buffer()[i]));
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other.inline_buffer()[i].~StorageType();
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}
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}
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}
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other.m_outline_buffer = nullptr;
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other.m_size = 0;
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other.reset_capacity();
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}
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Vector(Vector const& other)
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{
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ensure_capacity(other.size());
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TypedTransfer<StorageType>::copy(data(), other.data(), other.size());
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m_size = other.size();
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}
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template<size_t other_inline_capacity>
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Vector(Vector<T, other_inline_capacity> const& other)
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{
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ensure_capacity(other.size());
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TypedTransfer<StorageType>::copy(data(), other.data(), other.size());
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m_size = other.size();
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}
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~Vector()
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{
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clear();
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}
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Span<StorageType> span() { return { data(), size() }; }
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Span<StorageType const> span() const { return { data(), size() }; }
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operator Span<StorageType>() { return span(); }
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operator Span<StorageType const>() const { return span(); }
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bool is_empty() const { return size() == 0; }
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ALWAYS_INLINE size_t size() const { return m_size; }
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size_t capacity() const { return m_capacity; }
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StorageType* data()
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{
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if constexpr (inline_capacity > 0)
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return m_outline_buffer ? m_outline_buffer : inline_buffer();
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return m_outline_buffer;
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}
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StorageType const* data() const
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{
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if constexpr (inline_capacity > 0)
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return m_outline_buffer ? m_outline_buffer : inline_buffer();
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return m_outline_buffer;
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}
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ALWAYS_INLINE T const& at(size_t i) const
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{
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VERIFY(i < m_size);
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if constexpr (contains_reference)
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return *data()[i];
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else
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return data()[i];
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}
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ALWAYS_INLINE T& at(size_t i)
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{
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VERIFY(i < m_size);
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if constexpr (contains_reference)
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return *data()[i];
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else
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return data()[i];
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}
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ALWAYS_INLINE T const& operator[](size_t i) const { return at(i); }
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ALWAYS_INLINE T& operator[](size_t i) { return at(i); }
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T const& first() const { return at(0); }
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T& first() { return at(0); }
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T const& last() const { return at(size() - 1); }
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T& last() { return at(size() - 1); }
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template<typename TUnaryPredicate>
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Optional<T> first_matching(TUnaryPredicate predicate)
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{
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for (size_t i = 0; i < size(); ++i) {
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if (predicate(at(i))) {
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return at(i);
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}
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}
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return {};
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}
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template<typename TUnaryPredicate>
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Optional<T> last_matching(TUnaryPredicate predicate)
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{
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for (ssize_t i = size() - 1; i >= 0; --i) {
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if (predicate(at(i))) {
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return at(i);
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}
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}
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return {};
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}
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template<typename V>
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bool operator==(V const& other) const
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{
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if (m_size != other.size())
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return false;
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return TypedTransfer<StorageType>::compare(data(), other.data(), size());
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}
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bool contains_slow(T const& value) const
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{
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for (size_t i = 0; i < size(); ++i) {
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if (Traits<T>::equals(at(i), value))
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return true;
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}
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return false;
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}
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bool contains_in_range(T const& value, size_t const start, size_t const end) const
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{
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VERIFY(start <= end);
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VERIFY(end < size());
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for (size_t i = start; i <= end; ++i) {
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if (Traits<T>::equals(at(i), value))
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return true;
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}
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return false;
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}
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template<typename U = T>
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void insert(size_t index, U&& value) requires(CanBePlacedInsideVector<U>)
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{
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MUST(try_insert<U>(index, forward<U>(value)));
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}
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template<typename TUnaryPredicate, typename U = T>
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void insert_before_matching(U&& value, TUnaryPredicate predicate, size_t first_index = 0, size_t* inserted_index = nullptr) requires(CanBePlacedInsideVector<U>)
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{
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MUST(try_insert_before_matching(forward<U>(value), predicate, first_index, inserted_index));
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}
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void extend(Vector&& other)
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{
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MUST(try_extend(move(other)));
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}
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void extend(Vector const& other)
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{
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MUST(try_extend(other));
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}
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ALWAYS_INLINE void append(T&& value)
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{
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if constexpr (contains_reference)
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MUST(try_append(value));
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else
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MUST(try_append(move(value)));
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}
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ALWAYS_INLINE void append(T const& value) requires(!contains_reference)
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{
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MUST(try_append(T(value)));
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}
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void append(StorageType const* values, size_t count)
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{
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MUST(try_append(values, count));
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}
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template<typename U = T>
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ALWAYS_INLINE void unchecked_append(U&& value) requires(CanBePlacedInsideVector<U>)
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{
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VERIFY((size() + 1) <= capacity());
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if constexpr (contains_reference)
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new (slot(m_size)) StorageType(&value);
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else
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new (slot(m_size)) StorageType(forward<U>(value));
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++m_size;
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}
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ALWAYS_INLINE void unchecked_append(StorageType const* values, size_t count)
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{
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if (count == 0)
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return;
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VERIFY((size() + count) <= capacity());
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TypedTransfer<StorageType>::copy(slot(m_size), values, count);
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m_size += count;
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}
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template<class... Args>
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void empend(Args&&... args) requires(!contains_reference)
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{
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MUST(try_empend(forward<Args>(args)...));
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}
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template<typename U = T>
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void prepend(U&& value) requires(CanBePlacedInsideVector<U>)
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{
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MUST(try_insert(0, forward<U>(value)));
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}
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void prepend(Vector&& other)
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{
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MUST(try_prepend(move(other)));
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}
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void prepend(StorageType const* values, size_t count)
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{
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MUST(try_prepend(values, count));
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}
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// FIXME: What about assigning from a vector with lower inline capacity?
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Vector& operator=(Vector&& other)
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{
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if (this != &other) {
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clear();
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m_size = other.m_size;
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m_capacity = other.m_capacity;
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m_outline_buffer = other.m_outline_buffer;
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if constexpr (inline_capacity > 0) {
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if (!m_outline_buffer) {
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for (size_t i = 0; i < m_size; ++i) {
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new (&inline_buffer()[i]) StorageType(move(other.inline_buffer()[i]));
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other.inline_buffer()[i].~StorageType();
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}
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}
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}
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other.m_outline_buffer = nullptr;
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other.m_size = 0;
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other.reset_capacity();
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}
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return *this;
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}
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Vector& operator=(Vector const& other)
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{
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if (this != &other) {
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clear();
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ensure_capacity(other.size());
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TypedTransfer<StorageType>::copy(data(), other.data(), other.size());
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m_size = other.size();
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}
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return *this;
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}
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template<size_t other_inline_capacity>
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Vector& operator=(Vector<T, other_inline_capacity> const& other)
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{
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clear();
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ensure_capacity(other.size());
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TypedTransfer<StorageType>::copy(data(), other.data(), other.size());
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m_size = other.size();
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return *this;
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}
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void clear()
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{
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clear_with_capacity();
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if (m_outline_buffer) {
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kfree_sized(m_outline_buffer, m_capacity * sizeof(StorageType));
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m_outline_buffer = nullptr;
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}
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reset_capacity();
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}
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void clear_with_capacity()
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{
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for (size_t i = 0; i < m_size; ++i)
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data()[i].~StorageType();
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m_size = 0;
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}
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void remove(size_t index)
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{
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VERIFY(index < m_size);
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if constexpr (Traits<StorageType>::is_trivial()) {
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TypedTransfer<StorageType>::copy(slot(index), slot(index + 1), m_size - index - 1);
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} else {
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at(index).~StorageType();
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for (size_t i = index + 1; i < m_size; ++i) {
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new (slot(i - 1)) StorageType(move(at(i)));
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at(i).~StorageType();
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}
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}
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--m_size;
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}
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void remove(size_t index, size_t count)
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{
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if (count == 0)
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return;
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VERIFY(index + count > index);
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VERIFY(index + count <= m_size);
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if constexpr (Traits<StorageType>::is_trivial()) {
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TypedTransfer<StorageType>::copy(slot(index), slot(index + count), m_size - index - count);
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} else {
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for (size_t i = index; i < index + count; i++)
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at(i).~StorageType();
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for (size_t i = index + count; i < m_size; ++i) {
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new (slot(i - count)) StorageType(move(at(i)));
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at(i).~StorageType();
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}
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}
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m_size -= count;
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}
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template<typename TUnaryPredicate>
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bool remove_first_matching(TUnaryPredicate predicate)
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{
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for (size_t i = 0; i < size(); ++i) {
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if (predicate(at(i))) {
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remove(i);
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return true;
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}
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}
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return false;
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}
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template<typename TUnaryPredicate>
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void remove_all_matching(TUnaryPredicate predicate)
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{
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for (size_t i = 0; i < size();) {
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if (predicate(at(i))) {
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remove(i);
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} else {
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++i;
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}
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}
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}
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ALWAYS_INLINE T take_last()
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{
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VERIFY(!is_empty());
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auto value = move(raw_last());
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if constexpr (!contains_reference)
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last().~T();
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--m_size;
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if constexpr (contains_reference)
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return *value;
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else
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return value;
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}
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T take_first()
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{
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VERIFY(!is_empty());
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auto value = move(raw_first());
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remove(0);
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if constexpr (contains_reference)
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return *value;
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else
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return value;
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}
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T take(size_t index)
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{
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auto value = move(raw_at(index));
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remove(index);
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if constexpr (contains_reference)
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return *value;
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else
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return value;
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}
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T unstable_take(size_t index)
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{
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VERIFY(index < m_size);
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swap(raw_at(index), raw_at(m_size - 1));
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return take_last();
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}
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template<typename U = T>
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ErrorOr<void> try_insert(size_t index, U&& value) requires(CanBePlacedInsideVector<U>)
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{
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if (index > size())
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return Error::from_errno(EINVAL);
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if (index == size())
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return try_append(forward<U>(value));
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TRY(try_grow_capacity(size() + 1));
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++m_size;
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if constexpr (Traits<StorageType>::is_trivial()) {
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TypedTransfer<StorageType>::move(slot(index + 1), slot(index), m_size - index - 1);
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} else {
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for (size_t i = size() - 1; i > index; --i) {
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new (slot(i)) StorageType(move(at(i - 1)));
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at(i - 1).~StorageType();
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}
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}
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if constexpr (contains_reference)
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new (slot(index)) StorageType(&value);
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else
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new (slot(index)) StorageType(forward<U>(value));
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return {};
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}
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template<typename TUnaryPredicate, typename U = T>
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ErrorOr<void> try_insert_before_matching(U&& value, TUnaryPredicate predicate, size_t first_index = 0, size_t* inserted_index = nullptr) requires(CanBePlacedInsideVector<U>)
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{
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for (size_t i = first_index; i < size(); ++i) {
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if (predicate(at(i))) {
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TRY(try_insert(i, forward<U>(value)));
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if (inserted_index)
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*inserted_index = i;
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return {};
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}
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}
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TRY(try_append(forward<U>(value)));
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if (inserted_index)
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*inserted_index = size() - 1;
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return {};
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}
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ErrorOr<void> try_extend(Vector&& other)
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{
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if (is_empty() && capacity() <= other.capacity()) {
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*this = move(other);
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return {};
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}
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auto other_size = other.size();
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Vector tmp = move(other);
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TRY(try_grow_capacity(size() + other_size));
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TypedTransfer<StorageType>::move(data() + m_size, tmp.data(), other_size);
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m_size += other_size;
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return {};
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}
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ErrorOr<void> try_extend(Vector const& other)
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{
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TRY(try_grow_capacity(size() + other.size()));
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TypedTransfer<StorageType>::copy(data() + m_size, other.data(), other.size());
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m_size += other.m_size;
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return {};
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}
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ErrorOr<void> try_append(T&& value)
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{
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TRY(try_grow_capacity(size() + 1));
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if constexpr (contains_reference)
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new (slot(m_size)) StorageType(&value);
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else
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new (slot(m_size)) StorageType(move(value));
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++m_size;
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return {};
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}
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ErrorOr<void> try_append(T const& value) requires(!contains_reference)
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{
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return try_append(T(value));
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}
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ErrorOr<void> try_append(StorageType const* values, size_t count)
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{
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if (count == 0)
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return {};
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TRY(try_grow_capacity(size() + count));
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TypedTransfer<StorageType>::copy(slot(m_size), values, count);
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m_size += count;
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return {};
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}
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template<class... Args>
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ErrorOr<void> try_empend(Args&&... args) requires(!contains_reference)
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{
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TRY(try_grow_capacity(m_size + 1));
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new (slot(m_size)) StorageType { forward<Args>(args)... };
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++m_size;
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return {};
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}
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template<typename U = T>
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ErrorOr<void> try_prepend(U&& value) requires(CanBePlacedInsideVector<U>)
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{
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|
return try_insert(0, forward<U>(value));
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}
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|
|
|
ErrorOr<void> try_prepend(Vector&& other)
|
|
{
|
|
if (other.is_empty())
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|
return {};
|
|
|
|
if (is_empty()) {
|
|
*this = move(other);
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|
return {};
|
|
}
|
|
|
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auto other_size = other.size();
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TRY(try_grow_capacity(size() + other_size));
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|
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for (size_t i = size() + other_size - 1; i >= other.size(); --i) {
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new (slot(i)) StorageType(move(at(i - other_size)));
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at(i - other_size).~StorageType();
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}
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|
|
|
Vector tmp = move(other);
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|
TypedTransfer<StorageType>::move(slot(0), tmp.data(), tmp.size());
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|
m_size += other_size;
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|
return {};
|
|
}
|
|
|
|
ErrorOr<void> try_prepend(StorageType const* values, size_t count)
|
|
{
|
|
if (count == 0)
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|
return {};
|
|
TRY(try_grow_capacity(size() + count));
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|
TypedTransfer<StorageType>::move(slot(count), slot(0), m_size);
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|
TypedTransfer<StorageType>::copy(slot(0), values, count);
|
|
m_size += count;
|
|
return {};
|
|
}
|
|
|
|
ErrorOr<void> try_grow_capacity(size_t needed_capacity)
|
|
{
|
|
if (m_capacity >= needed_capacity)
|
|
return {};
|
|
return try_ensure_capacity(padded_capacity(needed_capacity));
|
|
}
|
|
|
|
ErrorOr<void> try_ensure_capacity(size_t needed_capacity)
|
|
{
|
|
if (m_capacity >= needed_capacity)
|
|
return {};
|
|
size_t new_capacity = kmalloc_good_size(needed_capacity * sizeof(StorageType)) / sizeof(StorageType);
|
|
auto* new_buffer = static_cast<StorageType*>(kmalloc_array(new_capacity, sizeof(StorageType)));
|
|
if (new_buffer == nullptr)
|
|
return Error::from_errno(ENOMEM);
|
|
|
|
if constexpr (Traits<StorageType>::is_trivial()) {
|
|
TypedTransfer<StorageType>::copy(new_buffer, data(), m_size);
|
|
} else {
|
|
for (size_t i = 0; i < m_size; ++i) {
|
|
new (&new_buffer[i]) StorageType(move(at(i)));
|
|
at(i).~StorageType();
|
|
}
|
|
}
|
|
if (m_outline_buffer)
|
|
kfree_sized(m_outline_buffer, m_capacity * sizeof(StorageType));
|
|
m_outline_buffer = new_buffer;
|
|
m_capacity = new_capacity;
|
|
return {};
|
|
}
|
|
|
|
ErrorOr<void> try_resize(size_t new_size, bool keep_capacity = false) requires(!contains_reference)
|
|
{
|
|
if (new_size <= size()) {
|
|
shrink(new_size, keep_capacity);
|
|
return {};
|
|
}
|
|
|
|
TRY(try_ensure_capacity(new_size));
|
|
|
|
for (size_t i = size(); i < new_size; ++i)
|
|
new (slot(i)) StorageType {};
|
|
m_size = new_size;
|
|
return {};
|
|
}
|
|
|
|
ErrorOr<void> try_resize_and_keep_capacity(size_t new_size) requires(!contains_reference)
|
|
{
|
|
return try_resize(new_size, true);
|
|
}
|
|
|
|
void grow_capacity(size_t needed_capacity)
|
|
{
|
|
MUST(try_grow_capacity(needed_capacity));
|
|
}
|
|
|
|
void ensure_capacity(size_t needed_capacity)
|
|
{
|
|
MUST(try_ensure_capacity(needed_capacity));
|
|
}
|
|
|
|
void shrink(size_t new_size, bool keep_capacity = false)
|
|
{
|
|
VERIFY(new_size <= size());
|
|
if (new_size == size())
|
|
return;
|
|
|
|
if (new_size == 0) {
|
|
if (keep_capacity)
|
|
clear_with_capacity();
|
|
else
|
|
clear();
|
|
return;
|
|
}
|
|
|
|
for (size_t i = new_size; i < size(); ++i)
|
|
at(i).~StorageType();
|
|
m_size = new_size;
|
|
}
|
|
|
|
void resize(size_t new_size, bool keep_capacity = false) requires(!contains_reference)
|
|
{
|
|
MUST(try_resize(new_size, keep_capacity));
|
|
}
|
|
|
|
void resize_and_keep_capacity(size_t new_size) requires(!contains_reference)
|
|
{
|
|
MUST(try_resize_and_keep_capacity(new_size));
|
|
}
|
|
|
|
using ConstIterator = SimpleIterator<Vector const, T const>;
|
|
using Iterator = SimpleIterator<Vector, T>;
|
|
|
|
ConstIterator begin() const { return ConstIterator::begin(*this); }
|
|
Iterator begin() { return Iterator::begin(*this); }
|
|
|
|
ConstIterator end() const { return ConstIterator::end(*this); }
|
|
Iterator end() { return Iterator::end(*this); }
|
|
|
|
template<typename TUnaryPredicate>
|
|
ConstIterator find_if(TUnaryPredicate&& finder) const
|
|
{
|
|
return AK::find_if(begin(), end(), forward<TUnaryPredicate>(finder));
|
|
}
|
|
|
|
template<typename TUnaryPredicate>
|
|
Iterator find_if(TUnaryPredicate&& finder)
|
|
{
|
|
return AK::find_if(begin(), end(), forward<TUnaryPredicate>(finder));
|
|
}
|
|
|
|
ConstIterator find(T const& value) const
|
|
{
|
|
return AK::find(begin(), end(), value);
|
|
}
|
|
|
|
Iterator find(T const& value)
|
|
{
|
|
return AK::find(begin(), end(), value);
|
|
}
|
|
|
|
Optional<size_t> find_first_index(T const& value) const
|
|
{
|
|
if (auto const index = AK::find_index(begin(), end(), value);
|
|
index < size()) {
|
|
return index;
|
|
}
|
|
return {};
|
|
}
|
|
|
|
void reverse()
|
|
{
|
|
for (size_t i = 0; i < size() / 2; ++i)
|
|
AK::swap(at(i), at(size() - i - 1));
|
|
}
|
|
|
|
private:
|
|
void reset_capacity()
|
|
{
|
|
m_capacity = inline_capacity;
|
|
}
|
|
|
|
static size_t padded_capacity(size_t capacity)
|
|
{
|
|
return max(static_cast<size_t>(4), capacity + (capacity / 4) + 4);
|
|
}
|
|
|
|
StorageType* slot(size_t i) { return &data()[i]; }
|
|
StorageType const* slot(size_t i) const { return &data()[i]; }
|
|
|
|
StorageType* inline_buffer()
|
|
{
|
|
static_assert(inline_capacity > 0);
|
|
return reinterpret_cast<StorageType*>(m_inline_buffer_storage);
|
|
}
|
|
StorageType const* inline_buffer() const
|
|
{
|
|
static_assert(inline_capacity > 0);
|
|
return reinterpret_cast<StorageType const*>(m_inline_buffer_storage);
|
|
}
|
|
|
|
StorageType& raw_last() { return raw_at(size() - 1); }
|
|
StorageType& raw_first() { return raw_at(0); }
|
|
StorageType& raw_at(size_t index) { return *slot(index); }
|
|
|
|
size_t m_size { 0 };
|
|
size_t m_capacity { 0 };
|
|
|
|
alignas(StorageType) unsigned char m_inline_buffer_storage[sizeof(StorageType) * inline_capacity];
|
|
StorageType* m_outline_buffer { nullptr };
|
|
};
|
|
|
|
template<class... Args>
|
|
Vector(Args... args) -> Vector<CommonType<Args...>>;
|
|
|
|
}
|
|
|
|
using AK::Vector;
|