/usr/include/trilinos/Teuchos_MatrixMarket_assignScalar.hpp is in libtrilinos-teuchos-dev 12.10.1-3.
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//
// Tpetra: Templated Linear Algebra Services Package
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#ifndef __Teuchos_MatrixMarket_assignScalar_hpp
#define __Teuchos_MatrixMarket_assignScalar_hpp
#include <Teuchos_as.hpp>
#include <Teuchos_ScalarTraits.hpp>
#include <string>
namespace Teuchos {
namespace MatrixMarket {
namespace details {
/// \class ScalarAssigner
/// \brief Implementation detail of assignScalar().
///
/// We define a class because template functions can't (in the
/// current C++ standard) have default template parameters.
template<class Scalar, bool isComplex=Teuchos::ScalarTraits<Scalar>::isComplex>
class ScalarAssigner {
public:
static void
assign (Scalar& val,
const typename Teuchos::ScalarTraits<Scalar>::magnitudeType& real,
const typename Teuchos::ScalarTraits<Scalar>::magnitudeType& imag);
};
// Partial specialization for real Scalar types.
template<class RealType>
class ScalarAssigner<RealType, false> {
public:
static void
assign (RealType& val,
const typename Teuchos::ScalarTraits<RealType>::magnitudeType& real,
const typename Teuchos::ScalarTraits<RealType>::magnitudeType& imag)
{
// imag had better be zero. We're ignoring it regardless.
(void) imag;
val = real;
}
};
#ifdef HAVE_TEUCHOS_COMPLEX
// Partial specialization for complex Scalar types.
// MagType is the template parameter for std::complex.
template<class MagType>
class ScalarAssigner<std::complex<MagType>, true> {
public:
static void
assign (std::complex<MagType>& val,
const typename Teuchos::ScalarTraits<std::complex<MagType> >::magnitudeType& real,
const typename Teuchos::ScalarTraits<std::complex<MagType> >::magnitudeType& imag)
{
val = std::complex<MagType> (real, imag);
}
};
#endif // HAVE_TEUCHOS_COMPLEX
/// \fn assignScalar
/// \brief Assign to a Scalar value: val = S(real, imag).
///
/// We have to template it because we don't know that S is a
/// complex type; if we write S(real,imag), the compiler will
/// complain if S is a real type.
template<class Scalar>
void
assignScalar (Scalar& val,
const typename Teuchos::ScalarTraits<Scalar>::magnitudeType& real,
const typename Teuchos::ScalarTraits<Scalar>::magnitudeType& imag)
{
ScalarAssigner<Scalar>::assign (val, real, imag);
}
} // namespace details
} // namespace MatrixMarket
} // namespace Teuchos
#endif // __Teuchos_MatrixMarket_assignScalar_hpp
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