mirror of
https://gitlab.com/libeigen/eigen.git
synced 2025-04-20 08:39:37 +08:00
01572b9f54
template parameter "Scalar" is removed. This is achieved by introducting a template <typename Derived> struct Scalar to achieve a forward-declaration of the Scalar typedefs.
27 lines
622 B
C++
27 lines
622 B
C++
#include <Eigen/Core>
|
|
USING_PART_OF_NAMESPACE_EIGEN
|
|
using namespace std;
|
|
|
|
template<typename Derived>
|
|
Eigen::Column<Derived>
|
|
firstColumn(MatrixBase<Derived>& m)
|
|
{
|
|
return Eigen::Column<Derived>(m.asArg(), 0);
|
|
}
|
|
|
|
template<typename Derived>
|
|
const Eigen::Column<Derived>
|
|
firstColumn(const MatrixBase<Derived>& m)
|
|
{
|
|
return Eigen::Column<Derived>(m.asArg(), 0);
|
|
}
|
|
|
|
int main(int, char**)
|
|
{
|
|
Matrix4d m = Matrix4d::identity();
|
|
cout << firstColumn(2*m) << endl; // calls the const version
|
|
firstColumn(m) *= 5; // calls the non-const version
|
|
cout << "Now the matrix m is:" << endl << m << endl;
|
|
return 0;
|
|
}
|