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); 

}