rust/src/libcore/box.rs
2012-09-20 09:48:05 -07:00

70 lines
1.7 KiB
Rust

//! Operations on shared box types
// NB: transitionary, de-mode-ing.
#[forbid(deprecated_mode)];
#[forbid(deprecated_pattern)];
use cmp::{Eq, Ord};
use intrinsic::TyDesc;
export ptr_eq, raw;
mod raw {
struct BoxHeaderRepr {
ref_count: uint,
type_desc: *TyDesc,
prev: *BoxRepr,
next: *BoxRepr,
}
struct BoxRepr {
header: BoxHeaderRepr,
data: u8
}
}
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) }
}
#[cfg(stage0)]
impl<T:Eq> @const T : Eq {
pure fn eq(&&other: @const T) -> bool { *self == *other }
pure fn ne(&&other: @const T) -> bool { *self != *other }
}
#[cfg(stage1)]
#[cfg(stage2)]
impl<T:Eq> @const T : Eq {
pure fn eq(other: &@const T) -> bool { *self == *(*other) }
pure fn ne(other: &@const T) -> bool { *self != *(*other) }
}
#[cfg(stage0)]
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 }
}
#[cfg(stage1)]
#[cfg(stage2)]
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));
}