28 lines
982 B
Rust
28 lines
982 B
Rust
// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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use std::ops::Index;
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pub trait Array2D: Index<usize> {
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fn rows(&self) -> usize;
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fn columns(&self) -> usize;
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fn get<'a>(&'a self, y: usize, x: usize) -> Option<&'a <Self as Index<usize>>::Output> {
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if y >= self.rows() || x >= self.columns() {
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return None;
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}
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let i = y * self.columns() + x;
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let indexer = &(*self as &Index<usize, Output = <Self as Index<usize>>::Output>);
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//~^ERROR non-scalar cast
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Some(indexer.index(i))
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}
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}
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fn main() {}
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