62 lines
1.3 KiB
Rust
62 lines
1.3 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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struct Pair<A,B> {
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a: A, b: B
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}
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struct RecEnum<A>(Rec<A>);
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struct Rec<A> {
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val: A,
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rec: Option<@mut RecEnum<A>>
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}
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fn make_cycle<A:'static>(a: A) {
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let g: @mut RecEnum<A> = @mut RecEnum(Rec {val: a, rec: None});
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g.rec = Some(g);
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}
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struct Invoker<A,B> {
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a: A,
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b: B,
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}
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trait Invokable<A,B> {
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fn f(&self) -> (A, B);
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}
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impl<A:Clone,B:Clone> Invokable<A,B> for Invoker<A,B> {
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fn f(&self) -> (A, B) {
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(self.a.clone(), self.b.clone())
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}
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}
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fn f<A:Send + Clone + 'static,
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B:Send + Clone + 'static>(
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a: A,
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b: B)
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-> @Invokable<A,B> {
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@Invoker {
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a: a,
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b: b,
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} as @Invokable<A,B>
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}
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pub fn main() {
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let x = 22_u8;
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let y = 44_u64;
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let z = f(~x, y);
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make_cycle(z);
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let (a, b) = z.f();
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info2!("a={} b={}", *a as uint, b as uint);
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assert_eq!(*a, x);
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assert_eq!(b, y);
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}
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