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use crate::algebra::abstr::{Field, Scalar};
use crate::algebra::linear::{Vector, Matrix};

pub struct MatrixColumnIntoIterator<'a, T>
{
    m: &'a Matrix<T>,
    column: usize
}

impl<'a, T> MatrixColumnIntoIterator<'a, T>
{
    pub fn new(m: &'a Matrix<T>) -> MatrixColumnIntoIterator<'a, T>
    {
        MatrixColumnIntoIterator{m, column: 0}
    }
}

impl<'a, T> Iterator for MatrixColumnIntoIterator<'a, T> where T: Field + Scalar
{
    type Item = Vector<T>;

    // just return the str reference
    fn next(&mut self) -> Option<Self::Item>
    {
        if self.column < self.m.ncols()
        {
            let column: Vector<T> = self.m.get_column(self.column);
            self.column += 1;

            Some(column)
        }
        else {
            None
        }
    }
}