/usr/include/dune/common/promotiontraits.hh is in libdune-common-dev 2.4.1-1.
This file is owned by root:root, with mode 0o644.
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// vi: set et ts=4 sw=2 sts=2:
#ifndef DUNE_PROMOTIONTRAITS_HH
#define DUNE_PROMOTIONTRAITS_HH
#include <complex>
namespace Dune {
/**
* @file
* @brief Provides some promotion traits
*
* For example, the promotion traits are used for the implementation of dot products @see <dune/common/dotproduct.hh>
* @author Matthias Wohlmuth
*/
/** @addtogroup Common
*
* @{
*/
/**
** \brief Class for type promotions. For example, the promotion traits are used for the implementation of dot products @see <dune/common/dotproduct.hh>
** \private basic template:
*/
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
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