fix build of class Block examples

2 files changed, 4 insertions, 4 deletions

diff --git a/doc/examples/class_Block.cpp b/doc/examples/class_Block.cpp
index c6144cef5..ace719afc 100644
--- a/doc/examples/class_Block.cpp
+++ b/doc/examples/class_Block.cpp
@@ -11,10 +11,10 @@ topLeftCorner(MatrixBase<Derived>& m, int rows, int cols)
 }
 
 template<typename Derived>
-const Eigen::Block<Derived>
+const Eigen::Block<const Derived>
 topLeftCorner(const MatrixBase<Derived>& m, int rows, int cols)
 {
-  return Eigen::Block<Derived>(m.derived(), 0, 0, rows, cols);
+  return Eigen::Block<const Derived>(m.derived(), 0, 0, rows, cols);
 }
 
 int main(int, char**)
diff --git a/doc/examples/class_FixedBlock.cpp b/doc/examples/class_FixedBlock.cpp
index 5e0e53da3..9978b32e8 100644
--- a/doc/examples/class_FixedBlock.cpp
+++ b/doc/examples/class_FixedBlock.cpp
@@ -11,10 +11,10 @@ topLeft2x2Corner(MatrixBase<Derived>& m)
 }
 
 template<typename Derived>
-const Eigen::Block<Derived, 2, 2>
+const Eigen::Block<const Derived, 2, 2>
 topLeft2x2Corner(const MatrixBase<Derived>& m)
 {
-  return Eigen::Block<Derived, 2, 2>(m.derived(), 0, 0);
+  return Eigen::Block<const Derived, 2, 2>(m.derived(), 0, 0);
 }
 
 int main(int, char**)