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