mirror of https://github.com/facebook/rocksdb.git
58 lines
1.6 KiB
C++
58 lines
1.6 KiB
C++
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under both the GPLv2 (found in the
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// COPYING file in the root directory) and Apache 2.0 License
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// (found in the LICENSE.Apache file in the root directory).
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// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file. See the AUTHORS file for names of contributors.
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#pragma once
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#include "port/port.h"
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#include "table/internal_iterator.h"
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namespace ROCKSDB_NAMESPACE {
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class ScopedArenaIterator {
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void reset(InternalIterator* iter) noexcept {
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if (iter_ != nullptr) {
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iter_->~InternalIterator();
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}
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iter_ = iter;
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}
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public:
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explicit ScopedArenaIterator(InternalIterator* iter = nullptr)
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: iter_(iter) {}
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ScopedArenaIterator(const ScopedArenaIterator&) = delete;
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ScopedArenaIterator& operator=(const ScopedArenaIterator&) = delete;
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ScopedArenaIterator(ScopedArenaIterator&& o) noexcept {
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iter_ = o.iter_;
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o.iter_ = nullptr;
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}
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ScopedArenaIterator& operator=(ScopedArenaIterator&& o) noexcept {
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reset(o.iter_);
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o.iter_ = nullptr;
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return *this;
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}
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InternalIterator* operator->() { return iter_; }
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InternalIterator* get() { return iter_; }
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void set(InternalIterator* iter) { reset(iter); }
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InternalIterator* release() {
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assert(iter_ != nullptr);
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auto* res = iter_;
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iter_ = nullptr;
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return res;
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}
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~ScopedArenaIterator() { reset(nullptr); }
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private:
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InternalIterator* iter_;
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};
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} // namespace ROCKSDB_NAMESPACE
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