mirror of
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25331cfdfd
Differential Revision: https://phabricator.services.mozilla.com/D106486
116 lines
3.2 KiB
C++
116 lines
3.2 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef nsClassHashtable_h__
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#define nsClassHashtable_h__
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#include <utility>
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#include "mozilla/UniquePtr.h"
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#include "nsBaseHashtable.h"
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#include "nsHashKeys.h"
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/**
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* Helper class that provides methods to wrap and unwrap the UserDataType.
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*/
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template <class T>
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class nsUniquePtrConverter {
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public:
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using UserDataType = T*;
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using DataType = mozilla::UniquePtr<T>;
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static UserDataType Unwrap(DataType& src) { return src.get(); }
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static DataType Wrap(UserDataType&& src) { return DataType(std::move(src)); }
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static DataType Wrap(const UserDataType& src) { return DataType(src); }
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};
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/**
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* templated hashtable class maps keys to C++ object pointers.
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* See nsBaseHashtable for complete declaration.
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* @param KeyClass a wrapper-class for the hashtable key, see nsHashKeys.h
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* for a complete specification.
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* @param Class the class-type being wrapped
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* @see nsInterfaceHashtable, nsClassHashtable
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*/
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template <class KeyClass, class T>
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class nsClassHashtable : public nsBaseHashtable<KeyClass, mozilla::UniquePtr<T>,
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T*, nsUniquePtrConverter<T>> {
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public:
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typedef typename KeyClass::KeyType KeyType;
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typedef T* UserDataType;
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typedef nsBaseHashtable<KeyClass, mozilla::UniquePtr<T>, T*,
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nsUniquePtrConverter<T>>
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base_type;
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using base_type::IsEmpty;
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using base_type::Remove;
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nsClassHashtable() = default;
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explicit nsClassHashtable(uint32_t aInitLength) : base_type(aInitLength) {}
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/**
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* @copydoc nsBaseHashtable::Get
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* @param aData if the key doesn't exist, pData will be set to nullptr.
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*/
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bool Get(KeyType aKey, UserDataType* aData) const;
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/**
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* @copydoc nsBaseHashtable::Get
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* @returns nullptr if the key is not present.
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*/
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[[nodiscard]] UserDataType Get(KeyType aKey) const;
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};
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template <typename K, typename T>
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inline void ImplCycleCollectionUnlink(nsClassHashtable<K, T>& aField) {
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aField.Clear();
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}
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template <typename K, typename T>
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inline void ImplCycleCollectionTraverse(
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nsCycleCollectionTraversalCallback& aCallback,
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const nsClassHashtable<K, T>& aField, const char* aName,
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uint32_t aFlags = 0) {
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for (auto iter = aField.ConstIter(); !iter.Done(); iter.Next()) {
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ImplCycleCollectionTraverse(aCallback, *iter.UserData(), aName, aFlags);
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}
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}
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//
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// nsClassHashtable definitions
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//
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template <class KeyClass, class T>
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bool nsClassHashtable<KeyClass, T>::Get(KeyType aKey, T** aRetVal) const {
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typename base_type::EntryType* ent = this->GetEntry(aKey);
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if (ent) {
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if (aRetVal) {
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*aRetVal = ent->GetData().get();
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}
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return true;
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}
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if (aRetVal) {
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*aRetVal = nullptr;
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}
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return false;
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}
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template <class KeyClass, class T>
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T* nsClassHashtable<KeyClass, T>::Get(KeyType aKey) const {
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typename base_type::EntryType* ent = this->GetEntry(aKey);
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if (!ent) {
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return nullptr;
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}
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return ent->GetData().get();
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}
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#endif // nsClassHashtable_h__
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