include/GaudiPython/Interface.h

0001 /***********************************************************************************\
0002 * (c) Copyright 1998-2019 CERN for the benefit of the LHCb and ATLAS collaborations *
0003 *                                                                                   *
0004 * This software is distributed under the terms of the Apache version 2 licence,     *
0005 * copied verbatim in the file "LICENSE".                                            *
0006 *                                                                                   *
0007 * In applying this licence, CERN does not waive the privileges and immunities       *
0008 * granted to it by virtue of its status as an Intergovernmental Organization        *
0009 * or submit itself to any jurisdiction.                                             *
0010 \***********************************************************************************/
0011 // ============================================================================
0012 #ifndef GAUDIPYTHON_INTERFACE_H
0013 #define GAUDIPYTHON_INTERFACE_H 1
0014 // ============================================================================
0015 // Include files
0016 // ============================================================================
0017 // STD & STL
0018 // ============================================================================
0019 #include <functional>
0020 // ============================================================================
0021 // GaudiKernel
0022 // ============================================================================
0023 #include "GaudiKernel/IInterface.h"
0024 #include "GaudiKernel/SmartIF.h"
0025 // ============================================================================
0026 // GaudiPython
0027 // ============================================================================
0028 #include "GaudiPython/GaudiPython.h"
0029 // ============================================================================
0030
0031 namespace GaudiPython {
0032   /** @struct Interface Interface.h GaudiPython/Interface.h
0033    *
0034    *  Minor mofidication of original Pere's structure
0035    *  GaudiPython::Interface
0036    *  This helper class is nesessary to perform C++
0037    *  castings from python.
0038    *
0039    *  @author Vanya BELYAEV Ivan.Belyaev@lapp.in2p3.fr
0040    *  @date   2005-08-03
0041    */
0042   template <class TYPE>
0043   struct Interface {
0044     /** the only one important method
0045      *   @param in  input interface
0046      *   @return resutl of "cast"
0047      */
0048     TYPE* operator()( const IInterface* in ) const {
0049       return SmartIF<TYPE>( TYPE::interfaceID(), const_cast<IInterface*>( in ) );
0050     }
0051
0052     /** the only one important method (static)
0053      *   @param in  input interface
0054      *   @return resutl of "cast"
0055      */
0056     static TYPE* cast( const IInterface* in ) { return SmartIF<TYPE>( const_cast<IInterface*>( in ) ); }
0057
0058     /** the only one important method (static)
0059      *   @param iid unique identifier of 'target' interface
0060      *   @param in  input interface
0061      *   @return resutl of "cast"
0062      */
0063     static TYPE* cast( const InterfaceID& iid, const IInterface* in ) {
0064       return SmartIF<TYPE>( iid, const_cast<IInterface*>( in ) );
0065     }
0066   };
0067
0068   template <>
0069   struct Interface<IInterface> {
0070     typedef IInterface TYPE;
0071     /** the only one important method
0072      *   @param in  input interface
0073      *   @return resutl of "cast"
0074      */
0075     TYPE* operator()( const IInterface* in ) const { return SmartIF<TYPE>( const_cast<IInterface*>( in ) ); }
0076
0077     /** the only one important method (static)
0078      *   @param in  input interface
0079      *   @return resutl of "cast"
0080      */
0081     static TYPE* cast( const IInterface* in ) { return SmartIF<TYPE>( const_cast<IInterface*>( in ) ); }
0082
0083     /** the only one important method (static)
0084      *   @param iid unique identifier of 'target' interface
0085      *   @param in  input interface
0086      *   @return resutl of "cast"
0087      */
0088     static TYPE* cast( const InterfaceID& /* iid */, const IInterface* in ) {
0089       return SmartIF<TYPE>( const_cast<IInterface*>( in ) );
0090     }
0091   };
0092
0093 } // end of namespace GaudiPython
0094
0095 #endif // GAUDIPYTHON_INTERFACE_H