Hi,

I'm trying to use the Ref class to define function arguments in a convenient way. I'm wondering however if it's possible to use these objects without initializing their size - e.g. I would like to do something like this:

Code: Select all

#include <Eigen/Dense>
#include <Eigen/Core>
#include <Eigen/src/Core/Ref.h>
using namespace Eigen;

void foo(const Ref<const MatrixXd>& A, Ref<MatrixXd> B){
B.resizeLike(A);
}

int main(){
MatrixXd A = MatrixXd::Constant(5,5,1);
MatrixXd B;

foo(A,B);

return 0;
}


The purpose of Ref is unify matrices, sub-matrices and mapped matrices. However, only Matrix<> objects are resizable, so if you want a resizable object use a Matrix<> type for the argument.

Ok, that works! Thanks for helping me!