39 lines
1.1 KiB
C
39 lines
1.1 KiB
C
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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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//
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// Arena class defines memory allocation methods. It's used by memtable and
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// skiplist.
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#ifndef STORAGE_LEVELDB_INCLUDE_ARENA_H_
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#define STORAGE_LEVELDB_INCLUDE_ARENA_H_
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namespace leveldb {
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class Arena {
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public:
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Arena() {};
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virtual ~Arena() {};
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// Return a pointer to a newly allocated memory block of "bytes" bytes.
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virtual char* Allocate(size_t bytes) = 0;
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// Allocate memory with the normal alignment guarantees provided by malloc.
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virtual char* AllocateAligned(size_t bytes) = 0;
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// Returns an estimate of the total memory used by arena.
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virtual const size_t ApproximateMemoryUsage() = 0;
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// Returns the total number of bytes in all blocks allocated so far.
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virtual const size_t MemoryAllocatedBytes() = 0;
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private:
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// No copying allowed
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Arena(const Arena&);
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void operator=(const Arena&);
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};
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} // namespace leveldb
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#endif // STORAGE_LEVELDB_INCLUDE_ARENA_H_
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