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This commit is contained in:
Peter Boyle 2015-04-18 18:37:56 +01:00
parent 3931ad65c8
commit 62ee8e1cb3

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#ifndef GRID_MATH_TYPE_MAPPER_H
#define GRID_MATH_TYPE_MAPPER_H
namespace Grid {
//////////////////////////////////////////////////////////////////////////////////
// Want to recurse: GridTypeMapper<Matrix<vComplexD> >::scalar_type == ComplexD.
// Use of a helper class like this allows us to template specialise and "dress"
// other classes such as RealD == double, ComplexD == std::complex<double> with these
// traits.
//
// It is possible that we could do this more elegantly if I introduced a
// queryable trait in iScalar, iMatrix and iVector and used the query on vtype in
// place of the type mapper?
//
// Not sure how to do this, but probably could be done with a research effort
// to study C++11's type_traits.h file. (std::enable_if<isGridTensorType<vtype> >)
//
//////////////////////////////////////////////////////////////////////////////////
template <class T> class GridTypeMapper {
public:
typedef typename T::scalar_type scalar_type;
typedef typename T::vector_type vector_type;
typedef typename T::tensor_reduced tensor_reduced;
enum { TensorLevel = T::TensorLevel };
};
//////////////////////////////////////////////////////////////////////////////////
// Recursion stops with these template specialisations
//////////////////////////////////////////////////////////////////////////////////
template<> class GridTypeMapper<RealF> {
public:
typedef RealF scalar_type;
typedef RealF vector_type;
typedef RealF tensor_reduced ;
enum { TensorLevel = 0 };
};
template<> class GridTypeMapper<RealD> {
public:
typedef RealD scalar_type;
typedef RealD vector_type;
typedef RealD tensor_reduced;
enum { TensorLevel = 0 };
};
template<> class GridTypeMapper<ComplexF> {
public:
typedef ComplexF scalar_type;
typedef ComplexF vector_type;
typedef ComplexF tensor_reduced;
enum { TensorLevel = 0 };
};
template<> class GridTypeMapper<ComplexD> {
public:
typedef ComplexD scalar_type;
typedef ComplexD vector_type;
typedef ComplexD tensor_reduced;
enum { TensorLevel = 0 };
};
template<> class GridTypeMapper<vRealF> {
public:
typedef RealF scalar_type;
typedef vRealF vector_type;
typedef vRealF tensor_reduced;
enum { TensorLevel = 0 };
};
template<> class GridTypeMapper<vRealD> {
public:
typedef RealD scalar_type;
typedef vRealD vector_type;
typedef vRealD tensor_reduced;
enum { TensorLevel = 0 };
};
template<> class GridTypeMapper<vComplexF> {
public:
typedef ComplexF scalar_type;
typedef vComplexF vector_type;
typedef vComplexF tensor_reduced;
enum { TensorLevel = 0 };
};
template<> class GridTypeMapper<vComplexD> {
public:
typedef ComplexD scalar_type;
typedef vComplexD vector_type;
typedef vComplexD tensor_reduced;
enum { TensorLevel = 0 };
};
template<> class GridTypeMapper<vInteger> {
public:
typedef Integer scalar_type;
typedef vInteger vector_type;
typedef vInteger tensor_reduced;
enum { TensorLevel = 0 };
};
}
#endif