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MatrixFunctions: replace eval() by nested.

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This eliminates an unnecessary copy in some situations, e.g. Map.
This commit is contained in:
Jitse Niesen
2013-07-31 14:57:20 +01:00
parent 43df1e707c
commit 68168e9eae
4 changed files with 29 additions and 24 deletions
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17
unsupported/Eigen/src/MatrixFunctions/MatrixFunction.h
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@@ -481,11 +481,15 @@ template<typename Derived> class MatrixFunctionReturnValue
: public ReturnByValue<MatrixFunctionReturnValue<Derived> >
{
public:
typedef typename Derived::Scalar Scalar;
typedef typename Derived::Index Index;
typedef typename internal::stem_function<Scalar>::type StemFunction;
protected:
typedef typename internal::nested<Derived, 10>::type DerivedNested;
public:
/** \brief Constructor.
*
* \param[in] A %Matrix (expression) forming the argument of the matrix function.
@@ -500,26 +504,25 @@ template<typename Derived> class MatrixFunctionReturnValue
template <typename ResultType>
inline void evalTo(ResultType& result) const
{
typedef typename Derived::PlainObject PlainObject;
typedef internal::traits<PlainObject> Traits;
typedef typename internal::remove_all<DerivedNested>::type DerivedNestedClean;
typedef internal::traits<DerivedNestedClean> Traits;
static const int RowsAtCompileTime = Traits::RowsAtCompileTime;
static const int ColsAtCompileTime = Traits::ColsAtCompileTime;
static const int Options = PlainObject::Options;
static const int Options = DerivedNestedClean::Options;
typedef std::complex<typename NumTraits<Scalar>::Real> ComplexScalar;
typedef Matrix<ComplexScalar, Dynamic, Dynamic, Options, RowsAtCompileTime, ColsAtCompileTime> DynMatrixType;
typedef internal::MatrixFunctionAtomic<DynMatrixType> AtomicType;
AtomicType atomic(m_f);
const PlainObject Aevaluated = m_A.eval();
internal::matrix_function_compute<PlainObject>::run(Aevaluated, atomic, result);
internal::matrix_function_compute<DerivedNestedClean>::run(m_A, atomic, result);
}
Index rows() const { return m_A.rows(); }
Index cols() const { return m_A.cols(); }
private:
typename internal::nested<Derived>::type m_A;
const DerivedNested m_A;
StemFunction *m_f;
};