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| 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. |
| 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 | +struct Mat<T> { data: Vec<T>, cols: uint, } |
| 12 | + |
| 13 | +impl<T> Mat<T> { |
| 14 | + fn new(data: Vec<T>, cols: uint) -> Mat<T> { |
| 15 | + Mat { data: data, cols: cols } |
| 16 | + } |
| 17 | + fn row<'a>(&'a self, row: uint) -> Row<&'a Mat<T>> { |
| 18 | + Row { mat: self, row: row, } |
| 19 | + } |
| 20 | +} |
| 21 | + |
| 22 | +impl<T> Index<(uint, uint), T> for Mat<T> { |
| 23 | + fn index<'a>(&'a self, &(row, col): &(uint, uint)) -> &'a T { |
| 24 | + &self.data[row * self.cols + col] |
| 25 | + } |
| 26 | +} |
| 27 | + |
| 28 | +impl<'a, T> Index<(uint, uint), T> for &'a Mat<T> { |
| 29 | + fn index<'b>(&'b self, index: &(uint, uint)) -> &'b T { |
| 30 | + (*self).index(index) |
| 31 | + } |
| 32 | +} |
| 33 | + |
| 34 | +struct Row<M> { mat: M, row: uint, } |
| 35 | + |
| 36 | +impl<T, M: Index<(uint, uint), T>> Index<uint, T> for Row<M> { |
| 37 | + fn index<'a>(&'a self, col: &uint) -> &'a T { |
| 38 | + &self.mat[(self.row, *col)] |
| 39 | + } |
| 40 | +} |
| 41 | + |
| 42 | +fn main() { |
| 43 | + let m = Mat::new(vec!(1u, 2, 3, 4, 5, 6), 3); |
| 44 | + let r = m.row(1); |
| 45 | + |
| 46 | + assert!(r.index(&2) == &6); |
| 47 | + assert!(r[2] == 6); |
| 48 | + assert!(r[2u] == 6u); |
| 49 | + assert!(6 == r[2]); |
| 50 | + |
| 51 | + let e = r[2]; |
| 52 | + assert!(e == 6); |
| 53 | + |
| 54 | + let e: uint = r[2]; |
| 55 | + assert!(e == 6); |
| 56 | +} |
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