Owned RowIter/ColumnIter, Matrix::into_row_iter()/into_column_iter()

[mankinskin]

I am trying to move a matrix into an iterator over its rows or columns. row_iter() borrows the matrix, which breaks my usecase:

fn large_f<N, It: Iterator<Item=N>>(matrix_map: impl Fn(Matrix) -> It, mat: Matrix) { ... }

I need a a function that can map a matrix to an iterator for the same operations either on the matrix' rows or columns.

let mat = ...;
large_f(
    |mat| mat.row_iter(), // use rows
    mat);
large_fn(
    |mat| mat.column_iter(), // use columns
    mat);

But the error is:

251 |             |mat| mat.row_iter(),
    |                   ---^^^^^^^^^^^^^^^^^
    |                   |
    |                   returns a value referencing data owned by the current function
    |                   `mat` is borrowed here

So I would need something like into_row_iter() which moves out of mat.

[sebcrozet]

Hi! Adding into_row_iter and into_column_iter sounds useful, yes.