hexga_math 0.0.11-beta.53

Math related crate that define number and casting, and support array programming...
Documentation 
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use super::*;

pub struct GridViewIterMut<'a, G, T, Idx, const N: usize>
where
    G: IGrid<T, Idx, N>,
    Idx: Integer,
    T: 'a,
{
    grid: &'a mut G,
    rect: RectangleIter<Idx, N>,
    phantom: std::marker::PhantomData<T>,
}

impl<'a, G, T, Idx, const N: usize> GridViewIterMut<'a, G, T, Idx, N>
where
    G: IGrid<T, Idx, N>,
    Idx: Integer,
    T: 'a,
{
    pub fn new(grid: &'a mut G) -> Self
    {
        let rect = grid.rect().iter_index();
        Self {
            grid,
            rect: rect,
            phantom: std::marker::PhantomData,
        }
    }

    pub fn from_rect(grid: &'a mut G, rect: Rectangle<Idx, N>) -> Option<Self>
    {
        if !grid.rect().is_rect_inside(rect)
        {
            return None;
        }
        else
        {
            Some(unsafe { Self::from_rect_unchecked(grid, rect) })
        }
    }

    pub unsafe fn from_rect_unchecked(grid: &'a mut G, rect: Rectangle<Idx, N>) -> Self
    {
        Self {
            grid,
            rect: rect.iter_index(),
            phantom: std::marker::PhantomData,
        }
    }

    pub fn from_rect_intersect(grid: &'a mut G, rect: Rectangle<Idx, N>) -> Self
    {
        let rect = grid.rect().intersect_or_empty(rect).iter_index();
        Self {
            grid,
            rect,
            phantom: std::marker::PhantomData,
        }
    }
}

impl<'a, G, T, Idx, const N: usize> Iterator for GridViewIterMut<'a, G, T, Idx, N>
where
    G: IGrid<T, Idx, N>,
    Idx: Integer,
{
    type Item = (Vector<Idx, N>, &'a mut T);

    fn next(&mut self) -> Option<Self::Item>
    {
        let idx = self.rect.next()?;
        // # Safety
        // Each index are different
        Some((idx, unsafe {
            (&mut *(&mut *self.grid as *mut G)).get_unchecked_mut(idx)
        }))
    }

    fn size_hint(&self) -> (usize, Option<usize>) { self.rect.size_hint() }
}
impl<'a, G, T, Idx, const N: usize> std::iter::FusedIterator for GridViewIterMut<'a, G, T, Idx, N>
where
    G: IGrid<T, Idx, N>,
    Idx: Integer,
    RectangleIter<Idx, N>: std::iter::FusedIterator,
{
}
impl<'a, G, T, Idx, const N: usize> std::iter::ExactSizeIterator
    for GridViewIterMut<'a, G, T, Idx, N>
where
    G: IGrid<T, Idx, N>,
    Idx: Integer,
    RectangleIter<Idx, N>: std::iter::ExactSizeIterator,
{
}

impl<'a, G, T, Idx, const N: usize> MapIntern for GridViewMut<'a, G, T, Idx, N>
where
    G: IGrid<T, Idx, N>,
    Idx: Integer,
{
    type Item = T;

    fn map_intern<F>(mut self, mut f: F) -> Self
    where
        F: FnMut(Self::Item) -> Self::Item,
    {
        self.iter_mut().for_each(|(_, v)| {
            unsafe {
                // Temporary moving the reference
                let old = std::ptr::read(v);
                let new = f(old);
                std::ptr::write(v, new);
            }
        });
        self
    }
}

impl<'a, G, T, Idx, const N: usize> MapInternWith for GridViewMut<'a, G, T, Idx, N>
where
    G: IGrid<T, Idx, N>,
    Idx: Integer,
    T: Clone,
{
    fn map_with_intern<F>(mut self, mut other: Self, mut f: F) -> Self
    where
        F: FnMut(Self::Item, Self::Item) -> Self::Item,
    {
        assert_eq!(self.size(), other.size(), "size mismatch");
        self.iter_mut()
            .zip(other.iter_mut())
            .for_each(|((_, a), (_, b))| {
                unsafe {
                    // Temporary moving the reference
                    let old = std::ptr::read(a);
                    let new = f(old, b.clone());
                    std::ptr::write(a, new);
                }
            });
        self
    }
}