25 lines
850 B
Plaintext
25 lines
850 B
Plaintext
namespace Eigen {
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namespace internal {
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template <typename ArgType>
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struct evaluator<Circulant<ArgType> > : evaluator_base<Circulant<ArgType> > {
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typedef Circulant<ArgType> XprType;
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typedef typename nested_eval<ArgType, XprType::ColsAtCompileTime>::type ArgTypeNested;
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typedef remove_all_t<ArgTypeNested> ArgTypeNestedCleaned;
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typedef typename XprType::CoeffReturnType CoeffReturnType;
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enum { CoeffReadCost = evaluator<ArgTypeNestedCleaned>::CoeffReadCost, Flags = Eigen::ColMajor };
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evaluator(const XprType& xpr) : m_argImpl(xpr.m_arg), m_rows(xpr.rows()) {}
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CoeffReturnType coeff(Index row, Index col) const {
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Index index = row - col;
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if (index < 0) index += m_rows;
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return m_argImpl.coeff(index);
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}
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evaluator<ArgTypeNestedCleaned> m_argImpl;
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const Index m_rows;
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};
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} // namespace internal
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} // namespace Eigen
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