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