bdc182cc41
fail!() used to require owned strings but can handle static strings now. Also, it can pass its arguments to fmt!() on its own, no need for the caller to call fmt!() itself.
56 lines
1.4 KiB
Rust
56 lines
1.4 KiB
Rust
// Copyright 2012 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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// Test overloading of the `[]` operator. In particular test that it
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// takes its argument *by reference*.
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use core::ops::Index;
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struct AssociationList<K,V> {
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pairs: ~[AssociationPair<K,V>]
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}
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struct AssociationPair<K,V> {
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key: K,
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value: V
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}
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impl<K,V> AssociationList<K,V> {
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fn push(&mut self, key: K, value: V) {
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self.pairs.push(AssociationPair {key: key, value: value});
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}
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}
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impl<K:Eq,V:Copy> Index<K,V> for AssociationList<K,V> {
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fn index(&self, index: &K) -> V {
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for self.pairs.each |pair| {
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if pair.key == *index {
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return copy pair.value;
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}
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}
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fail!("No value found for key: %?", index);
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}
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}
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pub fn main() {
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let foo = ~"foo";
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let bar = ~"bar";
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let mut list = AssociationList {pairs: ~[]};
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list.push(copy foo, 22);
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list.push(copy bar, 44);
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assert!(list[foo] == 22)
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assert!(list[bar] == 44)
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assert!(list[foo] == 22)
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assert!(list[bar] == 44)
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}
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