mirror of https://github.com/facebook/rocksdb.git
42 lines
1.5 KiB
C++
42 lines
1.5 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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#pragma once
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#include <algorithm>
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#include <memory>
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#include <string>
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#include "rocksdb/env.h"
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#include "rocksdb/merge_operator.h"
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#include "rocksdb/slice.h"
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#include "util/coding.h"
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#include "utilities/merge_operators.h"
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namespace ROCKSDB_NAMESPACE {
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// A 'model' merge operator that XORs two (same sized) array of bytes.
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// Implemented as an AssociativeMergeOperator for simplicity and example.
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class BytesXOROperator : public AssociativeMergeOperator {
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public:
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// XORs the two array of bytes one byte at a time and stores the result
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// in new_value. len is the number of xored bytes, and the length of new_value
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virtual bool Merge(const Slice& key,
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const Slice* existing_value,
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const Slice& value,
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std::string* new_value,
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Logger* logger) const override;
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static const char* kClassName() { return "BytesXOR"; }
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static const char* kNickName() { return "bytesxor"; }
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const char* NickName() const override { return kNickName(); }
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const char* Name() const override { return kClassName(); }
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void XOR(const Slice* existing_value, const Slice& value,
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std::string* new_value) const;
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};
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} // namespace ROCKSDB_NAMESPACE
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