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