Hg/proxy/optional_proxy.h
//  **************************************************************************
/// Conversion operator to a base Datum Type reference.
/// 
/// @note         The converted Datum base provides access to value interface
///               of the Datum object.
/// 
Conversion operator to a base Datum Type reference.
Conversion operator to a base Datum Type reference .
operator reference()
  {
    valid();
    return base_proxy.reference();
  }
operator reference ( ) { valid ( ) ; return base_proxy . reference ( ) ; }
Conversion operator to a base Datum Type reference.
Conversion operator to a base Datum Type reference .