bbtkRTTI.cxx

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/*=========================================================================                                                                               
  Program:   bbtk
  Module:    $RCSfile: bbtkRTTI.cxx,v $
  Language:  C++
  Date:      $Date: 2008/10/17 08:18:14 $
  Version:   $Revision: 1.3 $
=========================================================================*/

/* ---------------------------------------------------------------------

* Copyright (c) CREATIS-LRMN (Centre de Recherche en Imagerie Medicale)
* Authors : Eduardo Davila, Laurent Guigues, Jean-Pierre Roux
*
*  This software is governed by the CeCILL-B license under French law and 
*  abiding by the rules of distribution of free software. You can  use, 
*  modify and/ or redistribute the software under the terms of the CeCILL-B 
*  license as circulated by CEA, CNRS and INRIA at the following URL 
*  http://www.cecill.info/licences/Licence_CeCILL-B_V1-en.html 
*  or in the file LICENSE.txt.
*
*  As a counterpart to the access to the source code and  rights to copy,
*  modify and redistribute granted by the license, users are provided only
*  with a limited warranty  and the software's author,  the holder of the
*  economic rights,  and the successive licensors  have only  limited
*  liability. 
*
*  The fact that you are presently reading this means that you have had
*  knowledge of the CeCILL-B license and that you accept its terms.
* ------------------------------------------------------------------------ */                                                                         


#include "bbtkRTTI.h"
#include "bbtkMessageManager.h"


 
namespace bbtk
{
  // Adapted from https://savannah.cern.ch/support/download.php?file_id=1972
  
  // Something to which we can cast the void*s, to allow finding the
  // dynamic typeid.
  struct Dummy {
    virtual ~Dummy() {}
  };
  

 void*  run_time_up_or_down_cast( const std::type_info& target_type,
                               const std::type_info& source_type,
                               const void*  source_pointer
                               )
 {
   return run_time_up_or_down_cast(target_type,
                                   source_type,
                                   const_cast<void*>(source_pointer));
 }

  void*   run_time_up_or_down_cast( const std::type_info& target_type,
                               const std::type_info& source_type,
                               void*  source_pointer
                               )
  {
    bbtkDebugMessage("Data",5,
                     "run_time_up_or_down_cast : Casting pointer to '" 
                     << TypeName(typeid(*(Dummy*)source_pointer)) 
                     << "' from " << TypeName(source_type) 
                     << " to " << TypeName(target_type) << std::endl);

    void* target_pointer = 0;
#if __GNUC__ > 3 ||                                     \
  (__GNUC__ == 3 && (__GNUC_MINOR__ > 1 ||              \
                     (__GNUC_MINOR__ == 1 &&            \
                      __GNUC_PATCHLEVEL__ > 0)))
    
    const abi::__class_type_info* targetTI = 
      (const abi::__class_type_info *)( &(target_type));
    
    bbtkDebugMessage("Data",7," * source   = "<<source_pointer<<std::endl);

    void* tmp = source_pointer;
    if (source_type.__do_upcast(targetTI,&tmp)) 
      {
        target_pointer = tmp;
      }
    else 
      {
        bbtkDebugMessage("Data",7,
                         " * upcast failed : trying dynamic down cast"
                         <<std::endl);
        const abi::__class_type_info* sourceTI = 
          (const abi::__class_type_info *)( &(source_type));
        
        
        target_pointer = abi::__dynamic_cast(source_pointer, 
                                             sourceTI, 
                                             targetTI, 
                                             -1);   
      }
    
    bbtkDebugMessage("Data",7," * target   = "<<target_pointer<<std::endl);
    
#else
    bbtkWarning("run_time_up_or_down_cast not impl. on Win : to do");
    // target_pointer = __RTDynamicCast(source_pointer, 0, source_type, target_type, 0);
#endif
    return target_pointer;
    
  }

}