rust/vec2d/src/lib.rs
author unc0rr
Sun, 14 Oct 2018 21:26:15 +0200
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child 13916 cd437d76978a
permissions -rw-r--r--
Simplify Vec2D::new() a bit
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use std::iter;
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use std::ops::{Index, IndexMut};
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struct Vec2D<T> {
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    data: Vec<T>,
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    width: usize,
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    height: usize,
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}
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impl<T> Index<usize> for Vec2D<T> {
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    type Output = [T];
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    #[inline]
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    fn index(&self, row: usize) -> &[T] {
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        debug_assert!(row < self.height);
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        let pos = row * self.width;
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        &self.data[pos..pos + self.width]
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    }
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}
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impl<T> IndexMut<usize> for Vec2D<T> {
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    #[inline]
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    fn index_mut(&mut self, row: usize) -> &mut [T] {
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        debug_assert!(row < self.height);
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        let pos = row * self.width;
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        &mut self.data[pos..pos + self.width]
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    }
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}
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impl<T: Copy> Vec2D<T> {
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    pub fn new(width: usize, height: usize, value: T) -> Self {
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        Self {
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            data: vec![value; width * height],
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            width,
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            height,
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        }
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    }
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    #[inline]
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    pub fn width(&self) -> usize {
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        self.width
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    }
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    #[inline]
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    pub fn height(&self) -> usize {
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        self.height
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    }
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}
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#[cfg(test)]
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mod tests {
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    use super::*;
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    #[test]
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    fn basics() {
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        let mut v: Vec2D<u8> = Vec2D::new(2, 3, 0xff);
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        assert_eq!(v.width, 2);
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        assert_eq!(v.height, 3);
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        assert_eq!(v[0][0], 0xff);
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        assert_eq!(v[2][1], 0xff);
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        v[2][1] = 0;
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        assert_eq!(v[2][0], 0xff);
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        assert_eq!(v[2][1], 0);
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    }
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}