library/cpp/protobuf/util/merge.h


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#pragma once

namespace google { 
    namespace protobuf { 
        class Message; 
    } 
} 

namespace NProtoBuf { 
    using Message = ::google::protobuf::Message; 
} 

namespace NProtoBuf {
    // Similiar to Message::MergeFrom, overwrites existing repeated fields
    // and embedded messages completely instead of recursive merging.
    void RewriteMerge(const Message& src, Message& dst);

    // Does standard MergeFrom() by default, except messages/fields marked with DontMerge or DontMergeField option.
    // Such fields are merged using RewriteMerge() (i.e. destination is cleared before merging anything from source)
    void CustomMerge(const Message& src, Message& dst);

}