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rocksdb/utilities/merge_operators/string_append/stringappend.h

31 lines
783 B

/**
* A MergeOperator for rocksdb/leveldb that implements string append.
* @author Deon Nicholas (dnicholas@fb.com)
* Copyright 2013 Facebook
*/
#pragma once
#include "rocksdb/merge_operator.h"
#include "rocksdb/slice.h"
namespace rocksdb {
class StringAppendOperator : public AssociativeMergeOperator {
public:
StringAppendOperator(char delim_char); /// Constructor: specify delimiter
virtual bool Merge(const Slice& key,
const Slice* existing_value,
const Slice& value,
std::string* new_value,
Logger* logger) const override;
virtual const char* Name() const override;
private:
char delim_; // The delimiter is inserted between elements
};
} // namespace rocksdb