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Diffstat (limited to 'doc/examples/class_FixedBlock.cpp')
-rw-r--r-- | doc/examples/class_FixedBlock.cpp | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/doc/examples/class_FixedBlock.cpp b/doc/examples/class_FixedBlock.cpp new file mode 100644 index 000000000..9978b32e8 --- /dev/null +++ b/doc/examples/class_FixedBlock.cpp @@ -0,0 +1,27 @@ +#include <Eigen/Core> +#include <iostream> +using namespace Eigen; +using namespace std; + +template<typename Derived> +Eigen::Block<Derived, 2, 2> +topLeft2x2Corner(MatrixBase<Derived>& m) +{ + return Eigen::Block<Derived, 2, 2>(m.derived(), 0, 0); +} + +template<typename Derived> +const Eigen::Block<const Derived, 2, 2> +topLeft2x2Corner(const MatrixBase<Derived>& m) +{ + return Eigen::Block<const Derived, 2, 2>(m.derived(), 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; +} |