1 // Copyright 2014 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
11 // If `Index` used an associated type for its output, this test would
12 // work more smoothly.
19 struct Mat
<T
> { data: Vec<T>, cols: usize, }
22 fn new(data
: Vec
<T
>, cols
: usize) -> Mat
<T
> {
23 Mat { data: data, cols: cols }
25 fn row
<'a
>(&'a
self, row
: usize) -> Row
<&'a Mat
<T
>> {
26 Row { mat: self, row: row, }
30 impl<T
> Index
<(usize, usize)> for Mat
<T
> {
33 fn index
<'a
>(&'a
self, (row
, col
): (usize, usize)) -> &'a T
{
34 &self.data
[row
* self.cols
+ col
]
38 impl<'a
, T
> Index
<(usize, usize)> for &'a Mat
<T
> {
41 fn index
<'b
>(&'b
self, index
: (usize, usize)) -> &'b T
{
46 struct Row
<M
> { mat: M, row: usize, }
48 impl<T
, M
: Index
<(usize, usize), Output
=T
>> Index
<usize> for Row
<M
> {
51 fn index
<'a
>(&'a
self, col
: usize) -> &'a T
{
52 &self.mat
[(self.row
, col
)]
57 let m
= Mat
::new(vec
![1, 2, 3, 4, 5, 6], 3);
60 assert_eq
!(r
.index(2), &6);