Squashed 'third_party/eigen/' changes from 61d72f6..cf794d3
Change-Id: I9b814151b01f49af6337a8605d0c42a3a1ed4c72
git-subtree-dir: third_party/eigen
git-subtree-split: cf794d3b741a6278df169e58461f8529f43bce5d
diff --git a/doc/examples/make_circulant.cpp.evaluator b/doc/examples/make_circulant.cpp.evaluator
new file mode 100644
index 0000000..2ba79e7
--- /dev/null
+++ b/doc/examples/make_circulant.cpp.evaluator
@@ -0,0 +1,32 @@
+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;
+ };
+ }
+}