From 183bf54d27c948219585f52657355338eb695d08 Mon Sep 17 00:00:00 2001
From: Benoit Jacob <jacob.benoit.1@gmail.com>
Date: Sun, 13 Jan 2008 23:38:48 +0000
Subject: final fixes and updates for alpha3

---
 doc/examples/class_FixedBlock.cpp | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)
 create mode 100644 doc/examples/class_FixedBlock.cpp

(limited to 'doc/examples/class_FixedBlock.cpp')

diff --git a/doc/examples/class_FixedBlock.cpp b/doc/examples/class_FixedBlock.cpp
new file mode 100644
index 000000000..b34cf13ad
--- /dev/null
+++ b/doc/examples/class_FixedBlock.cpp
@@ -0,0 +1,26 @@
+#include <Eigen/Core>
+USING_PART_OF_NAMESPACE_EIGEN
+using namespace std;
+
+template<typename Scalar, typename Derived>
+Eigen::FixedBlock<Derived, 2, 2>
+topLeft2x2Corner(MatrixBase<Scalar, Derived>& m)
+{
+  return Eigen::FixedBlock<Derived, 2, 2>(m.ref(), 0, 0);
+}
+
+template<typename Scalar, typename Derived>
+const Eigen::FixedBlock<Derived, 2, 2>
+topLeft2x2Corner(const MatrixBase<Scalar, Derived>& m)
+{
+  return Eigen::FixedBlock<Derived, 2, 2>(m.ref(), 0, 0);
+}
+
+int main(int, char**)
+{
+  Matrix3d m = Matrix3d::identity();
+  cout << topLeft2x2Corner(4*m) << endl; // calls the const version
+  topLeft2x2Corner(m) *= 2;              // calls the non-const version
+  cout << "Now the matrix m is:" << endl << m << endl;
+  return 0;
+}
-- 
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