From 8fdffdd573e6d36b04cde595460887dd4e1a2340 Mon Sep 17 00:00:00 2001
From: Jitse Niesen <jitse@maths.leeds.ac.uk>
Date: Fri, 2 Aug 2013 22:33:12 +0100
Subject: Move inheritance from Eigen example in stand-alone file. Also fix a
 small mistake (Vector3d instead of VectorXd).

---
 doc/examples/CustomizingEigen_Inheritance.cpp | 30 +++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)
 create mode 100644 doc/examples/CustomizingEigen_Inheritance.cpp

(limited to 'doc/examples')

diff --git a/doc/examples/CustomizingEigen_Inheritance.cpp b/doc/examples/CustomizingEigen_Inheritance.cpp
new file mode 100644
index 000000000..48df64ee3
--- /dev/null
+++ b/doc/examples/CustomizingEigen_Inheritance.cpp
@@ -0,0 +1,30 @@
+#include <Eigen/Core>
+#include <iostream>
+
+class MyVectorType : public Eigen::VectorXd
+{
+public:
+    MyVectorType(void):Eigen::VectorXd() {}
+
+    // This constructor allows you to construct MyVectorType from Eigen expressions
+    template<typename OtherDerived>
+    MyVectorType(const Eigen::MatrixBase<OtherDerived>& other)
+        : Eigen::VectorXd(other)
+    { }
+
+    // This method allows you to assign Eigen expressions to MyVectorType
+    template<typename OtherDerived>
+    MyVectorType& operator=(const Eigen::MatrixBase <OtherDerived>& other)
+    {
+        this->Eigen::VectorXd::operator=(other);
+        return *this;
+    }
+};
+
+int main()
+{
+  MyVectorType v = MyVectorType::Ones(4);
+  v(2) += 10;
+  v = 2 * v;
+  std::cout << v.transpose() << std::endl;
+}
-- 
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