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RocksDB for Erlang

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rocksdb c_src counter_merge_operator.h
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c_src/counter_merge_operator.h 

// Copyright (c) 2018-2025 Benoit Chesneau

//

// This file is provided to you under the Apache License,

// Version 2.0 (the "License"); you may not use this file

// except in compliance with the License.  You may obtain

// a copy of the License at

//

//   http://www.apache.org/licenses/LICENSE-2.0

//

// Unless required by applicable law or agreed to in writing,

// software distributed under the License is distributed on an

// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY

// KIND, either express or implied.  See the License for the

// specific language governing permissions and limitations

// under the License.





#pragma once

#include "rocksdb/merge_operator.h"

#include "rocksdb/slice.h"



// forward declaation

namespace rocksdb {

    class AssociativeMergeOperator;

}



namespace erocksdb {



    class CounterMergeOperator : public rocksdb::AssociativeMergeOperator {



        public:

            explicit CounterMergeOperator();



            virtual bool Merge(

                    const rocksdb::Slice& key,

                    const rocksdb::Slice* existing_value,

                    const rocksdb::Slice& value,

                    std::string* new_value,

                    rocksdb::Logger* logger) const override;



            virtual const char* Name() const override;

    };



    std::shared_ptr<CounterMergeOperator> CreateCounterMergeOperator();



}