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rocksdb/include/rocksdb/cleanable.h

71 lines
2.1 KiB

// 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 "rocksdb/rocksdb_namespace.h"
namespace ROCKSDB_NAMESPACE {
class Cleanable {
public:
Cleanable();
// No copy constructor and copy assignment allowed.
Cleanable(Cleanable&) = delete;
Cleanable& operator=(Cleanable&) = delete;
~Cleanable();
// Move constructor and move assignment is allowed.
Cleanable(Cleanable&&);
Cleanable& operator=(Cleanable&&);
// Clients are allowed to register function/arg1/arg2 triples that
// will be invoked when this iterator is destroyed.
//
// Note that unlike all of the preceding methods, this method is
// not abstract and therefore clients should not override it.
using CleanupFunction = void (*)(void* arg1, void* arg2);
void RegisterCleanup(CleanupFunction function, void* arg1, void* arg2);
void DelegateCleanupsTo(Cleanable* other);
// DoCleanup and also resets the pointers for reuse
inline void Reset() {
DoCleanup();
cleanup_.function = nullptr;
cleanup_.next = nullptr;
}
protected:
struct Cleanup {
CleanupFunction function;
void* arg1;
void* arg2;
Cleanup* next;
};
Cleanup cleanup_;
// It also becomes the owner of c
void RegisterCleanup(Cleanup* c);
private:
// Performs all the cleanups. It does not reset the pointers. Making it
// private
// to prevent misuse
inline void DoCleanup() {
if (cleanup_.function != nullptr) {
(*cleanup_.function)(cleanup_.arg1, cleanup_.arg2);
for (Cleanup* c = cleanup_.next; c != nullptr;) {
(*c->function)(c->arg1, c->arg2);
Cleanup* next = c->next;
delete c;
c = next;
}
}
}
};
} // namespace ROCKSDB_NAMESPACE