class Translator {
public:
    Translator() = default;
    void Add(string_view source, string_view target){
        dictionary_source_target.insert({std::string (source), std::string (target)});
        dictionary_target_source.insert({std::string (target), std::string (source)});

    }

    string_view TranslateForward(string_view source) const{
         try {
             return dictionary_source_target.at(std::string (source));
         }catch (const std::out_of_range& error){

         }
        return "";
    }

    string_view TranslateBackward(string_view target) const{
        try {
            return dictionary_target_source.at(std::string(target));
        }catch (const std::out_of_range& error){

        }
        return "";
    }

private:
    std::map<string, string> dictionary_source_target;
    std::map<string, string> dictionary_target_source;
}; how can I make this class using std::map<std::string_view, string_view> ?