| Brian Silverman | 72890c2 | 2015-09-19 14:37:37 -0400 | [diff] [blame^] | 1 | #include <Eigen/Core> |
| 2 | #include <iostream> |
| 3 | using namespace Eigen; |
| 4 | using namespace std; |
| 5 | |
| 6 | template<typename Derived> |
| 7 | Eigen::Block<Derived> |
| 8 | topLeftCorner(MatrixBase<Derived>& m, int rows, int cols) |
| 9 | { |
| 10 | return Eigen::Block<Derived>(m.derived(), 0, 0, rows, cols); |
| 11 | } |
| 12 | |
| 13 | template<typename Derived> |
| 14 | const Eigen::Block<const Derived> |
| 15 | topLeftCorner(const MatrixBase<Derived>& m, int rows, int cols) |
| 16 | { |
| 17 | return Eigen::Block<const Derived>(m.derived(), 0, 0, rows, cols); |
| 18 | } |
| 19 | |
| 20 | int main(int, char**) |
| 21 | { |
| 22 | Matrix4d m = Matrix4d::Identity(); |
| 23 | cout << topLeftCorner(4*m, 2, 3) << endl; // calls the const version |
| 24 | topLeftCorner(m, 2, 3) *= 5; // calls the non-const version |
| 25 | cout << "Now the matrix m is:" << endl << m << endl; |
| 26 | return 0; |
| 27 | } |