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Teuchos_getBaseObjVoidPtr.hpp
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00001 // @HEADER
00002 // ***********************************************************************
00003 //
00004 //                    Teuchos: Common Tools Package
00005 //                 Copyright (2004) Sandia Corporation
00006 //
00007 // Under terms of Contract DE-AC04-94AL85000, there is a non-exclusive
00008 // license for use of this work by or on behalf of the U.S. Government.
00009 //
00010 // This library is free software; you can redistribute it and/or modify
00011 // it under the terms of the GNU Lesser General Public License as
00012 // published by the Free Software Foundation; either version 2.1 of the
00013 // License, or (at your option) any later version.
00014 //
00015 // This library is distributed in the hope that it will be useful, but
00016 // WITHOUT ANY WARRANTY; without even the implied warranty of
00017 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00018 // Lesser General Public License for more details.
00019 //
00020 // You should have received a copy of the GNU Lesser General Public
00021 // License along with this library; if not, write to the Free Software
00022 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
00023 // USA
00024 // Questions? Contact Michael A. Heroux (maherou@sandia.gov)
00025 //
00026 // ***********************************************************************
00027 // @HEADER
00028 
00029 #ifndef TEUCHOS_GET_BASE_OBJ_VOID_PTR
00030 #define TEUCHOS_GET_BASE_OBJ_VOID_PTR
00031 
00032 
00033 #include "Teuchos_ConfigDefs.hpp"
00034 
00035 
00036 #ifdef HAS_TEUCHOS_BOOST_IS_POLYMORPHIC
00037 
00038 
00039 // Internal Trilinos code should check if the macro is defined to see if
00040 // getBaseObjPtr() is supported or not.
00041 #define HAS_TEUCHOS_GET_BASE_OBJ_VOID_PTR 1
00042 
00043 
00044 #include <boost/type_traits/is_polymorphic.hpp>
00045 
00046 
00047 namespace Teuchos {
00048 
00049 
00050 template<bool isPolymorphic, typename T>
00051 class GetBaseObjVoidPtrImpl {};
00052 
00053 template<typename T>
00054 class GetBaseObjVoidPtrImpl<true, T> {
00055 public:
00056   static const void* getBaseObjVoidPtr(T *p)
00057     {
00058       return dynamic_cast<const void*>(p);
00059     } 
00060 };
00061 
00062 
00063 template<typename T>
00064 class GetBaseObjVoidPtrImpl<false, T> {
00065 public:
00066   static const void* getBaseObjVoidPtr(T *p)
00067     {
00068       return static_cast<const void*>(p);
00069     }
00070 };
00071 
00072 
00089 template<typename T>
00090 const void* getBaseObjVoidPtr(T *p)
00091 {
00092   typedef GetBaseObjVoidPtrImpl<boost::is_polymorphic<T>::value, T> GBOVPT;
00093   return GBOVPT::getBaseObjVoidPtr(p);
00094 }
00095 
00096 
00097 } // end namespace Teuchos
00098 
00099 
00100 #endif // HAS_TEUCHOS_BOOST_IS_POLYMORPHIC
00101 
00102 
00103 #endif // TEUCHOS_GET_BASE_OBJ_VOID_PTR
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