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// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
static tau: float = 2.0*3.14159265358979323;
struct Point {x: float, y: float}
struct Size {w: float, h: float}
enum shape {
circle(Point, float),
rectangle(Point, Size)
}
fn compute_area(shape: &shape) -> float {
match *shape {
circle(_, radius) => 0.5 * tau * radius * radius,
rectangle(_, ref size) => size.w * size.h
}
}
pub impl shape {
// self is in the implicit self region
fn select<'r, T>(&self, threshold: float,
a: &'r T, b: &'r T) -> &'r T {
if compute_area(self) > threshold {a} else {b}
}
}
fn select_based_on_unit_circle<'r, T>(
threshold: float, a: &'r T, b: &'r T) -> &'r T {
let shape = &circle(Point{x: 0.0, y: 0.0}, 1.0);
shape.select(threshold, a, b)
}
struct thing {
x: A
}
struct A { a: @int }
fn thing(x: A) -> thing {
thing {
x: copy x
}
}
pub impl thing {
fn foo(@self) -> int { *self.x.a }
fn bar(~self) -> int { *self.x.a }
fn quux(&self) -> int { *self.x.a }
fn baz(&self) -> &'self A { &self.x }
fn spam(self) -> int { *self.x.a }
}
trait Nus { fn f(&self); }
impl Nus for thing { fn f(&self) {} }
pub fn main() {
let x = @thing(A {a: @10});
assert!(x.foo() == 10);
assert!(x.quux() == 10);
let y = ~thing(A {a: @10});
assert!((copy y).bar() == 10);
assert!(y.quux() == 10);
let z = thing(A {a: @11});
assert!(z.spam() == 11);
}
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