promotiontraits.hh

Go to the documentation of this file.

// -*- tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
// vi: set et ts=4 sw=2 sts=2:
#ifndef DUNE_PROMOTIONTRAITS_HH
#define DUNE_PROMOTIONTRAITS_HH
 
#include <complex>
 
namespace Dune {
  template <typename T1, typename T2>
  struct PromotionTraits { };
 
#ifndef DOXYGEN
  // class for type promotion; // the same types are the same:
  template <typename T1>
  struct PromotionTraits<T1,T1> { typedef T1 PromotedType; };
 
  // promote to complex type
  template <typename T1>
  struct PromotionTraits<std::complex<T1>,T1> { typedef std::complex<T1> PromotedType; };
 
  // \private promote to complex type
  template <typename T1>
  struct PromotionTraits<T1,std::complex<T1> > { typedef std::complex<T1> PromotedType; };
 
  // a few specializations for some common cases
  template<> struct PromotionTraits<std::complex<double>,std::complex<double> >   { typedef std::complex<double> PromotedType; };
  template<> struct PromotionTraits<std::complex<double>,double>   { typedef std::complex<double> PromotedType; };
  template<> struct PromotionTraits<double,std::complex<double> >   { typedef std::complex<double> PromotedType; };
  template<> struct PromotionTraits<double,double>   { typedef double PromotedType; };
 
  template<> struct PromotionTraits<std::complex<float>,float>   { typedef std::complex<float> PromotedType; };
  template<> struct PromotionTraits<float,std::complex<float> >   { typedef std::complex<float> PromotedType; };
  template<> struct PromotionTraits<std::complex<float>,std::complex<float> >   { typedef std::complex<float> PromotedType; };
  template<> struct PromotionTraits<float,float>   { typedef float PromotedType; };
 
  template<> struct PromotionTraits<std::complex<int>,int>   { typedef std::complex<int> PromotedType; };
  template<> struct PromotionTraits<int,std::complex<int> >   { typedef std::complex<int> PromotedType; };
  template<> struct PromotionTraits<std::complex<int>,std::complex<int> >   { typedef std::complex<int> PromotedType; };
  template<> struct PromotionTraits<int,int>   { typedef int PromotedType; };
#endif // DOXYGEN
 
} // end namespace
 
 
#endif // DUNE_PROMOTIONTRAITS_HH