initial commit

third_party/eigen/doc/examples/TemplateKeyword_simple.cpp

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+#include <Eigen/Dense>
+#include <iostream>
+
+using Eigen::MatrixXf;
+
+void copyUpperTriangularPart(MatrixXf& dst, const MatrixXf& src) {
+  dst.triangularView<Eigen::Upper>() = src.triangularView<Eigen::Upper>();
+}
+
+int main() {
+  MatrixXf m1 = MatrixXf::Ones(4, 4);
+  MatrixXf m2 = MatrixXf::Random(4, 4);
+  std::cout << "m2 before copy:" << std::endl;
+  std::cout << m2 << std::endl << std::endl;
+  copyUpperTriangularPart(m2, m1);
+  std::cout << "m2 after copy:" << std::endl;
+  std::cout << m2 << std::endl << std::endl;
+}