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//
// Tpetra: Templated Linear Algebra Services Package
// Copyright (2008) Sandia Corporation
//
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#ifndef TPETRA_DETAILS_BLAS_HPP
#define TPETRA_DETAILS_BLAS_HPP
/// \file Tpetra_Details_Blas.hpp
/// \brief Type traits for Tpetra's BLAS wrappers; an implementation
/// detail of Tpetra::MultiVector.
///
/// \warning This file, and its contents, are an implementation detail
/// of Tpetra::MultiVector. Either may disappear or change at any
/// time.
#include "TpetraCore_config.h"
#include "Kokkos_Core.hpp"
#include "Kokkos_Complex.hpp"
#include <type_traits>
namespace Tpetra {
namespace Details {
namespace Blas {
/// \brief Do BLAS libraries (all that are compliant with the BLAS
/// Standard) support the given "scalar" (matrix entry) type?
///
/// Use the class like this:
/// <tt> BlasSupportsScalar<YourScalarType>::value; </tt>
template<class ScalarType>
struct BlasSupportsScalar {
static constexpr bool value =
std::is_same<ScalarType, float>::value ||
std::is_same<ScalarType, double>::value ||
std::is_same<ScalarType, ::Kokkos::complex<float> >::value ||
std::is_same<ScalarType, ::Kokkos::complex<double> >::value;
};
/// \brief Do BLAS libraries (all that are compliant with the BLAS
/// Standard) support the given Kokkos array layout?
///
/// Use the class like this:
/// <tt> BlasSupportsLayout<typename SomeKokkosViewType::array_layout>::value; </tt>
template<class LayoutType>
struct BlasSupportsLayout {
static constexpr bool value =
std::is_same<LayoutType, ::Kokkos::LayoutLeft>::value;
};
template<class ViewType,
class IndexType = int>
IndexType
getStride2DView (const ViewType& A)
{
IndexType stride[8];
A.stride (stride);
return (A.dimension_1 () > 1) ? stride[1] : A.dimension_0 ();
}
} // namespace Blas
} // namespace Details
} // namespace Tpetra
#endif // TPETRA_DETAILS_BLAS_HPP
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