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template<typename DATA_TYPE>
void TcpAbstractCommand::_streamWrite(DATA_TYPE &var) {
    UtilDataStream::write(_dataStreamWrite, var);
}

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_streamWrite(_user->getColumn(column));

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error: no matching function for call to 'xyz::_streamWrite(QVariant)'
note: candidate is:
note: void xyz::_streamWrite(DATA_TYPE&) [with DATA_TYPE = QVariant]
note:   no known conversion for argument 1 from 'QVariant' to 'QVariant&'

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    QVariant write = _user->getColumn(column);
    _streamWrite(write);