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rocksdb

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RocksDB for Erlang

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rocksdb deps rocksdb utilities merge_operators string_append stringappend.h
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deps/rocksdb/utilities/merge_operators/string_append/stringappend.h 

//  Copyright (c) Meta Platforms, Inc. and affiliates.

//  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).

//

// A MergeOperator for rocksdb that implements string append.



#pragma once

#include "rocksdb/merge_operator.h"

#include "rocksdb/slice.h"



namespace ROCKSDB_NAMESPACE {



class StringAppendOperator : public AssociativeMergeOperator {

 public:

  // Constructor: specify delimiter

  explicit StringAppendOperator(char delim_char);

  explicit StringAppendOperator(const std::string& delim);



  bool Merge(const Slice& key, const Slice* existing_value, const Slice& value,

             std::string* new_value, Logger* logger) const override;



  static const char* kClassName() { return "StringAppendOperator"; }

  static const char* kNickName() { return "stringappend"; }

  const char* Name() const override { return kClassName(); }

  const char* NickName() const override { return kNickName(); }



 private:

  std::string delim_;  // The delimiter is inserted between elements

};



}  // namespace ROCKSDB_NAMESPACE