Squashed 'third_party/eigen/' content from commit 61d72f6
Change-Id: Iccc90fa0b55ab44037f018046d2fcffd90d9d025
git-subtree-dir: third_party/eigen
git-subtree-split: 61d72f6383cfa842868c53e30e087b0258177257
diff --git a/doc/examples/function_taking_eigenbase.cpp b/doc/examples/function_taking_eigenbase.cpp
new file mode 100644
index 0000000..49d94b3
--- /dev/null
+++ b/doc/examples/function_taking_eigenbase.cpp
@@ -0,0 +1,18 @@
+#include <iostream>
+#include <Eigen/Core>
+using namespace Eigen;
+
+template <typename Derived>
+void print_size(const EigenBase<Derived>& b)
+{
+ std::cout << "size (rows, cols): " << b.size() << " (" << b.rows()
+ << ", " << b.cols() << ")" << std::endl;
+}
+
+int main()
+{
+ Vector3f v;
+ print_size(v);
+ // v.asDiagonal() returns a 3x3 diagonal matrix pseudo-expression
+ print_size(v.asDiagonal());
+}