Ifpack2 Templated Preconditioning Package Version 1.0
Ifpack2_ConfigDefs.hpp
00001 /*@HEADER
00002 // ***********************************************************************
00003 // 
00004 //       Ifpack2: Tempated Object-Oriented Algebraic Preconditioner Package
00005 //                 Copyright (2009) 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 
00030 #ifndef _IFPACK2_CONFIGDEFS_HPP_
00031 #define _IFPACK2_CONFIGDEFS_HPP_
00032 
00033 #include <Ifpack2_config.h>
00034 #include <Teuchos_ScalarTraits.hpp>
00035 
00036 //The sgn function isn't well defined for complex.
00037 //Is it correct to operate on the real part of x as is done below?
00038 template<class Scalar>
00039 typename Teuchos::ScalarTraits<Scalar>::magnitudeType
00040 IFPACK2_SGN(const Scalar& x)
00041 {
00042   static const typename Teuchos::ScalarTraits<Scalar>::magnitudeType one = Teuchos::ScalarTraits<Scalar>::magnitude(Teuchos::ScalarTraits<Scalar>::one());
00043   return Teuchos::ScalarTraits<Scalar>::real(x) > 0.0 ? -one : one;
00044 }
00045 
00046 #include <Tpetra_ConfigDefs.hpp>
00047 namespace Ifpack2 {
00048   typedef Tpetra::global_size_t global_size_t;
00049 }
00050 
00051 #endif /*_IFPACK2_CONFIGDEFS_HPP_*/
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