| Austin Schuh | 189376f | 2018-12-20 22:11:15 +1100 | [diff] [blame^] | 1 | namespace Eigen { |
| 2 | namespace internal { |
| 3 | template<typename ArgType> |
| 4 | struct evaluator<Circulant<ArgType> > |
| 5 | : evaluator_base<Circulant<ArgType> > |
| 6 | { |
| 7 | typedef Circulant<ArgType> XprType; |
| 8 | typedef typename nested_eval<ArgType, XprType::ColsAtCompileTime>::type ArgTypeNested; |
| 9 | typedef typename remove_all<ArgTypeNested>::type ArgTypeNestedCleaned; |
| 10 | typedef typename XprType::CoeffReturnType CoeffReturnType; |
| 11 | |
| 12 | enum { |
| 13 | CoeffReadCost = evaluator<ArgTypeNestedCleaned>::CoeffReadCost, |
| 14 | Flags = Eigen::ColMajor |
| 15 | }; |
| 16 | |
| 17 | evaluator(const XprType& xpr) |
| 18 | : m_argImpl(xpr.m_arg), m_rows(xpr.rows()) |
| 19 | { } |
| 20 | |
| 21 | CoeffReturnType coeff(Index row, Index col) const |
| 22 | { |
| 23 | Index index = row - col; |
| 24 | if (index < 0) index += m_rows; |
| 25 | return m_argImpl.coeff(index); |
| 26 | } |
| 27 | |
| 28 | evaluator<ArgTypeNestedCleaned> m_argImpl; |
| 29 | const Index m_rows; |
| 30 | }; |
| 31 | } |
| 32 | } |