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vec2d.rs
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vec2d.rs
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use std::ops::{Index, IndexMut};
/// A 2 dimensional matrix in row-major order backed by a contiguous `Vec`
#[derive(Debug)]
pub struct Vec2D<T> {
data: Box<[T]>,
rows: usize,
cols: usize,
}
impl<T> Vec2D<T> {
/// Initialize a grid of size (`rows`, `cols`) with the given data element.
pub fn init(data: T, size: (usize, usize)) -> Vec2D<T>
where
T: Clone,
{
let (rows, cols) = size;
let len = rows
.checked_mul(cols)
.unwrap_or_else(|| panic!("{} rows by {} cols exceeds usize::MAX", rows, cols));
Vec2D {
data: vec![data; len].into_boxed_slice(),
rows,
cols,
}
}
/// Fills the grid with elements by cloning `value`.
pub fn fill(&mut self, value: T)
where
T: Clone,
{
self.data.fill(value)
}
}
impl<T> Index<usize> for Vec2D<T> {
type Output = [T];
fn index(&self, row: usize) -> &Self::Output {
if row < self.rows {
let start_row = row * self.cols;
&self.data[start_row..start_row + self.cols]
} else {
panic!("row index {:?} out of bounds.", row);
}
}
}
impl<T> IndexMut<usize> for Vec2D<T> {
fn index_mut(&mut self, row: usize) -> &mut Self::Output {
if row < self.rows {
let start_row = row * self.cols;
&mut self.data[start_row..start_row + self.cols]
} else {
panic!("row index {:?} out of bounds.", row);
}
}
}
#[cfg(test)]
mod test {
use super::*;
#[test]
fn vec2d_init() {
let vec2d = Vec2D::init(1, (2, 3));
assert_eq!(vec2d[0], [1, 1, 1]);
assert_eq!(vec2d[1], [1, 1, 1]);
}
#[test]
fn vec2d_fill() {
let mut vec2d = Vec2D::init(0, (2, 3));
vec2d.fill(7);
assert_eq!(vec2d[0], [7, 7, 7]);
assert_eq!(vec2d[1], [7, 7, 7]);
}
#[test]
fn vec2d_index() {
let vec2d = Vec2D {
data: vec![0, 1, 2, 3, 4, 5, 6, 7, 8].into_boxed_slice(),
rows: 3,
cols: 3,
};
assert_eq!(vec2d[0], [0, 1, 2]);
assert_eq!(vec2d[1], [3, 4, 5]);
assert_eq!(vec2d[2], [6, 7, 8]);
}
#[test]
fn vec2d_index_mut() {
let mut vec2d = Vec2D {
data: vec![0, 1, 2, 3, 4, 5, 6, 7, 8].into_boxed_slice(),
rows: 3,
cols: 3,
};
vec2d[1][1] = 9;
assert_eq!(vec2d[0], [0, 1, 2]);
assert_eq!(vec2d[1], [3, 9, 5]);
assert_eq!(vec2d[2], [6, 7, 8]);
}
#[test]
#[should_panic]
fn vec2d_index_out_of_bounds() {
let vec2d = Vec2D::init(1, (2, 3));
let _x = vec2d[2][4];
}
#[test]
#[should_panic]
fn vec2d_index_out_of_bounds_vec_edge() {
let vec2d = Vec2D::init(1, (2, 3));
let _x = vec2d[1][3];
}
#[test]
#[should_panic]
fn vec2d_index_out_of_bounds_overflow() {
let vec2d = Vec2D::init(1, (2, 3));
let _x = vec2d[0][3];
}
#[test]
#[should_panic]
fn vec2d_indexmut_out_of_bounds_vec_edge() {
let mut vec2d = Vec2D::init(1, (2, 3));
vec2d[1][3] = 0;
}
#[test]
#[should_panic]
fn vec2d_indexmut_out_of_bounds_overflow() {
let mut vec2d = Vec2D::init(1, (2, 3));
vec2d[0][3] = 0;
}
#[test]
#[should_panic]
fn vec2d_indexmut_out_of_bounds() {
let mut vec2d = Vec2D::init(1, (2, 3));
vec2d[2][4] = 0;
}
}