Teuchos_getBaseObjVoidPtr.hpp

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//
//                    Teuchos: Common Tools Package
//                 Copyright (2004) Sandia Corporation
//
// Under terms of Contract DE-AC04-94AL85000, there is a non-exclusive
// license for use of this work by or on behalf of the U.S. Government.
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// This library is free software; you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as
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// Lesser General Public License for more details.
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// You should have received a copy of the GNU Lesser General Public
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#ifndef TEUCHOS_GET_BASE_OBJ_VOID_PTR
#define TEUCHOS_GET_BASE_OBJ_VOID_PTR


#include "Teuchos_ConfigDefs.hpp"


#ifdef HAS_TEUCHOS_BOOST_IS_POLYMORPHIC


// Internal Trilinos code should check if the macro is defined to see if
// getBaseObjPtr() is supported or not.
#define HAS_TEUCHOS_GET_BASE_OBJ_VOID_PTR 1


#include <boost/type_traits/is_polymorphic.hpp>


namespace Teuchos {


template<bool isPolymorphic, typename T>
class GetBaseObjVoidPtrImpl {};

template<typename T>
class GetBaseObjVoidPtrImpl<true, T> {
public:
  static const void* getBaseObjVoidPtr(T *p)
    {
      return dynamic_cast<const void*>(p);
    } 
};


template<typename T>
class GetBaseObjVoidPtrImpl<false, T> {
public:
  static const void* getBaseObjVoidPtr(T *p)
    {
      return static_cast<const void*>(p);
    }
};


template<typename T>
const void* getBaseObjVoidPtr(T *p)
{
  typedef GetBaseObjVoidPtrImpl<boost::is_polymorphic<T>::value, T> GBOVPT;
  return GBOVPT::getBaseObjVoidPtr(p);
}


} // end namespace Teuchos


#endif // HAS_TEUCHOS_BOOST_IS_POLYMORPHIC


#endif // TEUCHOS_GET_BASE_OBJ_VOID_PTR