ParamDesc& set_is_distance(bool x=true) { is_distance_=x; return *this;}
bool get_is_distance()const { return is_distance_; }
}; // END of class ParamDesc
ParamDesc& set_is_distance(bool x=true) { is_distance_=x; return *this;}
bool get_is_distance()const { return is_distance_; }
}; // END of class ParamDesc