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#include <Eigen/Core>
USING_PART_OF_NAMESPACE_EIGEN
using namespace std;
// define a custom template binary functor
struct CwiseMinOp {
template<typename Scalar>
static Scalar op(const Scalar& a, const Scalar& b) { return std::min(a,b); }
};
// define a custom binary operator between two matrices
template<typename Scalar, typename Derived1, typename Derived2>
const Eigen::CwiseBinaryOp<CwiseMinOp, Derived1, Derived2>
cwiseMin(const MatrixBase<Scalar, Derived1> &mat1, const MatrixBase<Scalar, Derived2> &mat2)
{
return Eigen::CwiseBinaryOp<CwiseMinOp, Derived1, Derived2>(mat1.asArg(), mat2.asArg());
// Note that the above is equivalent to:
// return mat1.template cwise<CwiseMinOp>(mat2);
}
int main(int, char**)
{
Matrix4d m1 = Matrix4d::random(), m2 = Matrix4d::random();
cout << cwiseMin(m1,m2) << endl; // use our new global operator
cout << m1.cwise<CwiseMinOp>(m2) << endl; // directly use the generic expression member
return 0;
}
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