64324e329e
Summary: As you know, almost all compilers support "pragma once" keyword instead of using include guards. To be keep consistency between header files, all header files are edited. Besides this, try to fix some warnings about loss of data. Pull Request resolved: https://github.com/facebook/rocksdb/pull/4339 Differential Revision: D9654990 Pulled By: ajkr fbshipit-source-id: c2cf3d2d03a599847684bed81378c401920ca848
40 lines
1.3 KiB
C++
40 lines
1.3 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 {
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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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virtual const char* Name() const override {
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return "BytesXOR";
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}
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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
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