--- /dev/null
+// 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).
+//
+
+#pragma once
+
+#include "rocksdb/memory_allocator.h"
+
+namespace ROCKSDB_NAMESPACE {
+
+struct CustomDeleter {
+ CustomDeleter(MemoryAllocator* a = nullptr) : allocator(a) {}
+
+ void operator()(char* ptr) const {
+ if (allocator) {
+ allocator->Deallocate(reinterpret_cast<void*>(ptr));
+ } else {
+ delete[] ptr;
+ }
+ }
+
+ MemoryAllocator* allocator;
+};
+
+using CacheAllocationPtr = std::unique_ptr<char[], CustomDeleter>;
+
+inline CacheAllocationPtr AllocateBlock(size_t size,
+ MemoryAllocator* allocator) {
+ if (allocator) {
+ auto block = reinterpret_cast<char*>(allocator->Allocate(size));
+ return CacheAllocationPtr(block, allocator);
+ }
+ return CacheAllocationPtr(new char[size]);
+}
+
+} // namespace ROCKSDB_NAMESPACE