Teuchos - Trilinos Tools Package Version of the Day
Teuchos_as.hpp
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_AS_HPP
00030 #define TEUCHOS_AS_HPP
00031 
00032 #include "Teuchos_TestForException.hpp"
00033 
00034 
00035 namespace Teuchos {
00036 
00037 
00066 template<class TypeTo, class TypeFrom>
00067 class ValueTypeConversionTraits {
00068 public:
00069   static TypeTo convert( const TypeFrom t )
00070     {
00071       return t;
00072       // This default implementation is just an implicit conversion and will
00073       // generate compiler warning on dangerous conversions.
00074     }
00075   static TypeTo safeConvert( const TypeFrom t )
00076     {
00077       return t;
00078       // This default implementation is just an implicit conversion and will
00079       // generate compiler warning on dangerous conversions.  No runtime
00080       // checking can be done by default; only specializations can define
00081       // meaningful and portable runtime checks of conversions.
00082     }
00083 };
00084 
00085 
00117 template<class TypeTo, class TypeFrom>
00118 inline TypeTo as( const TypeFrom& t )
00119 {
00120 #ifdef TEUCHOS_DEBUG
00121   return ValueTypeConversionTraits<TypeTo,TypeFrom>::safeConvert(t);
00122 #else
00123   return ValueTypeConversionTraits<TypeTo,TypeFrom>::convert(t);
00124 #endif
00125 }
00126 
00127 
00157 template<class TypeTo, class TypeFrom>
00158 inline TypeTo asSafe( const TypeFrom& t )
00159 {
00160   return ValueTypeConversionTraits<TypeTo,TypeFrom>::safeConvert(t);
00161 }
00162 
00163 
00164 //
00165 // Standard specializations of ValueTypeConversionTraits
00166 //
00167 
00168 
00169 // ToDo: Add specializations as needed!
00170 
00171 
00172 } // end namespace Teuchos
00173 
00174 
00175 #endif // TEUCHOS_AS_HPP
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