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1 | // Copyright 2015 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. | |
4 | // | |
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. | |
10 | ||
11 | use std::ops::Index; | |
12 | ||
13 | pub trait Array2D: Index<usize> { | |
14 | fn rows(&self) -> usize; | |
15 | fn columns(&self) -> usize; | |
16 | fn get<'a>(&'a self, y: usize, x: usize) -> Option<&'a <Self as Index<usize>>::Output> { | |
17 | if y >= self.rows() || x >= self.columns() { | |
18 | return None; | |
19 | } | |
20 | let i = y * self.columns() + x; | |
21 | let indexer = &(*self as &Index<usize, Output = <Self as Index<usize>>::Output>); | |
041b39d2 | 22 | //~^ERROR non-primitive cast |
c1a9b12d SL |
23 | Some(indexer.index(i)) |
24 | } | |
25 | } | |
26 | ||
27 | fn main() {} |