зеркало из https://github.com/mozilla/gecko-dev.git
67 строки
2.0 KiB
C++
67 строки
2.0 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 nsDataHashtable_h__
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#define nsDataHashtable_h__
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#include "nsHashKeys.h"
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#include "nsBaseHashtable.h"
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#include "mozilla/Maybe.h"
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/**
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* templated hashtable class maps keys to simple datatypes.
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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 DataType the simple datatype being wrapped
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* @see nsInterfaceHashtable, nsClassHashtable
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*/
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template <class KeyClass, class DataType>
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class nsDataHashtable : public nsBaseHashtable<KeyClass, DataType, DataType> {
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private:
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typedef nsBaseHashtable<KeyClass, DataType, DataType> BaseClass;
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public:
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using typename BaseClass::EntryType;
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using typename BaseClass::KeyType;
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nsDataHashtable() {}
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explicit nsDataHashtable(uint32_t aInitLength) : BaseClass(aInitLength) {}
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/**
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* Retrieve a reference to the value for a key.
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*
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* @param aKey the key to retrieve.
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* @return a reference to the found value, or nullptr if no entry was found
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* with the given key.
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*/
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DataType* GetValue(KeyType aKey) {
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if (EntryType* ent = this->GetEntry(aKey)) {
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return &ent->mData;
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}
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return nullptr;
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}
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/**
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* Retrieve the value for a key and remove the corresponding entry at
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* the same time.
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*
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* @param aKey the key to retrieve and remove
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* @return the found value, or Nothing if no entry was found with the
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* given key.
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*/
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mozilla::Maybe<DataType> GetAndRemove(KeyType aKey) {
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mozilla::Maybe<DataType> value;
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if (EntryType* ent = this->GetEntry(aKey)) {
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value.emplace(std::move(ent->mData));
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this->RemoveEntry(ent);
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}
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return value;
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}
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};
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#endif // nsDataHashtable_h__
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