initial commit

2026-10-22 09:23:54 +08:00
commit 63f557a39f
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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 remove_all_t<ArgTypeNested> 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;
+};
+}  // namespace internal
+}  // namespace Eigen