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 } 33
