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32 lines
948 B
32 lines
948 B
namespace Eigen {
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namespace internal {
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template<typename ArgType>
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struct evaluator<Circulant<ArgType> >
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: evaluator_base<Circulant<ArgType> >
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{
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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 typename remove_all<ArgTypeNested>::type ArgTypeNestedCleaned;
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typedef typename XprType::CoeffReturnType CoeffReturnType;
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enum {
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CoeffReadCost = evaluator<ArgTypeNestedCleaned>::CoeffReadCost,
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Flags = Eigen::ColMajor
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};
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evaluator(const XprType& xpr)
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: m_argImpl(xpr.m_arg), m_rows(xpr.rows())
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{ }
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CoeffReturnType coeff(Index row, Index col) const
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{
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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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}
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}
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