FastDeploy/third_party/eigen/doc/examples/class_FixedBlock.cpp

#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;
}