# HG changeset patch
# User unc0rr
# Date 1539544412 -7200
# Node ID fa9f93393e9c7fdbebdfc19dbdb6f8b75595f53f
# Parent  6c8d4e140f27e67006b8ba0a8e307d8712d7b025
Implement vec2d library to use for land arrays in the future

diff -r 6c8d4e140f27 -r fa9f93393e9c rust/vec2d/Cargo.toml
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/rust/vec2d/Cargo.toml	Sun Oct 14 21:13:32 2018 +0200
@@ -0,0 +1,6 @@
+[package]
+name = "vec2d"
+version = "0.1.0"
+authors = ["Andrey Korotaev <a.korotaev@hedgewars.org>"]
+
+[dependencies]
diff -r 6c8d4e140f27 -r fa9f93393e9c rust/vec2d/src/lib.rs
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/rust/vec2d/src/lib.rs	Sun Oct 14 21:13:32 2018 +0200
@@ -0,0 +1,77 @@
+use std::iter;
+use std::ops::{Index, IndexMut};
+
+struct Vec2D<T> {
+    data: Vec<T>,
+    width: usize,
+    height: usize,
+}
+
+impl<T> Index<usize> for Vec2D<T> {
+    type Output = [T];
+
+    #[inline]
+    fn index(&self, row: usize) -> &[T] {
+        debug_assert!(row < self.height);
+
+        let pos = row * self.width;
+
+        &self.data[pos..pos + self.width]
+    }
+}
+
+impl<T> IndexMut<usize> for Vec2D<T> {
+    #[inline]
+    fn index_mut(&mut self, row: usize) -> &mut [T] {
+        debug_assert!(row < self.height);
+
+        let pos = row * self.width;
+
+        &mut self.data[pos..pos + self.width]
+    }
+}
+
+impl<T: Copy> Vec2D<T> {
+    pub fn new(width: usize, height: usize, value: T) -> Self {
+        let mut vec = Self {
+            data: Vec::new(),
+            width,
+            height,
+        };
+
+        vec.data.extend(iter::repeat(value).take(width * height));
+
+        vec
+    }
+
+    #[inline]
+    pub fn width(&self) -> usize {
+        self.width
+    }
+
+    #[inline]
+    pub fn height(&self) -> usize {
+        self.height
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn basics() {
+        let mut v: Vec2D<u8> = Vec2D::new(2, 3, 0xff);
+
+        assert_eq!(v.width, 2);
+        assert_eq!(v.height, 3);
+
+        assert_eq!(v[0][0], 0xff);
+        assert_eq!(v[2][1], 0xff);
+
+        v[2][1] = 0;
+
+        assert_eq!(v[2][0], 0xff);
+        assert_eq!(v[2][1], 0);
+    }
+}