rust/src/libcore/box.rs
2012-09-04 11:12:17 -07:00

36 lines
890 B
Rust

//! Operations on shared box types
// NB: transitionary, de-mode-ing.
#[forbid(deprecated_mode)];
#[forbid(deprecated_pattern)];
use cmp::{Eq, Ord};
export ptr_eq;
pure fn ptr_eq<T>(a: @T, b: @T) -> bool {
//! Determine if two shared boxes point to the same object
unsafe { ptr::addr_of(*a) == ptr::addr_of(*b) }
}
impl<T:Eq> @const T : Eq {
pure fn eq(&&other: @const T) -> bool { *self == *other }
}
impl<T:Ord> @const T : Ord {
pure fn lt(&&other: @const T) -> bool { *self < *other }
pure fn le(&&other: @const T) -> bool { *self <= *other }
pure fn ge(&&other: @const T) -> bool { *self >= *other }
pure fn gt(&&other: @const T) -> bool { *self > *other }
}
#[test]
fn test() {
let x = @3;
let y = @3;
assert (ptr_eq::<int>(x, x));
assert (ptr_eq::<int>(y, y));
assert (!ptr_eq::<int>(x, y));
assert (!ptr_eq::<int>(y, x));
}