2012-12-10 19:32:48 -06:00
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// 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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2012-07-06 17:50:50 -05:00
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// Tests that type assignability is used to search for instances when
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// making method calls, but only if there aren't any matches without
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// it.
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2012-07-31 12:27:51 -05:00
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trait iterable<A> {
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2013-05-03 15:33:33 -05:00
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fn iterate(&self, blk: &fn(x: &A) -> bool) -> bool;
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2012-07-06 17:50:50 -05:00
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}
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2013-03-25 15:21:04 -05:00
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impl<'self,A> iterable<A> for &'self [A] {
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2013-05-03 15:33:33 -05:00
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fn iterate(&self, f: &fn(x: &A) -> bool) -> bool {
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vec::each(*self, f)
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2012-07-06 17:50:50 -05:00
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}
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}
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2013-02-14 13:47:00 -06:00
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impl<A> iterable<A> for ~[A] {
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2013-05-03 15:33:33 -05:00
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fn iterate(&self, f: &fn(x: &A) -> bool) -> bool {
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vec::each(*self, f)
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2012-07-06 17:50:50 -05:00
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}
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}
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fn length<A, T: iterable<A>>(x: T) -> uint {
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let mut len = 0;
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for x.iterate() |_y| { len += 1 }
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2012-08-01 19:30:05 -05:00
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return len;
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2012-07-06 17:50:50 -05:00
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}
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2013-02-01 21:43:17 -06:00
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pub fn main() {
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2012-07-06 17:50:50 -05:00
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let x = ~[0,1,2,3];
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// Call a method
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2013-03-28 20:39:09 -05:00
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for x.iterate() |y| { assert!(x[*y] == *y); }
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2012-07-06 17:50:50 -05:00
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// Call a parameterized function
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2013-03-28 20:39:09 -05:00
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assert!(length(x.clone()) == vec::len(x));
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2012-07-06 17:50:50 -05:00
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// Call a parameterized function, with type arguments that require
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// a borrow
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2013-03-28 20:39:09 -05:00
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assert!(length::<int, &[int]>(x) == vec::len(x));
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2012-07-06 17:50:50 -05:00
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// Now try it with a type that *needs* to be borrowed
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2012-10-09 23:28:04 -05:00
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let z = [0,1,2,3];
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2012-07-06 17:50:50 -05:00
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// Call a method
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2013-03-28 20:39:09 -05:00
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for z.iterate() |y| { assert!(z[*y] == *y); }
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2012-07-06 17:50:50 -05:00
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// Call a parameterized function
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2013-03-28 20:39:09 -05:00
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assert!(length::<int, &[int]>(z) == vec::len(z));
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2012-07-06 17:50:50 -05:00
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}
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