64 lines
1.7 KiB
Rust
64 lines
1.7 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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//! Operations on managed box types
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// NB: transitionary, de-mode-ing.
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#[forbid(deprecated_mode)];
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#[forbid(deprecated_pattern)];
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use cmp::{Eq, Ord};
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use intrinsic::TyDesc;
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use ptr;
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pub mod raw {
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pub struct BoxHeaderRepr {
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ref_count: uint,
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type_desc: *TyDesc,
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prev: *BoxRepr,
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next: *BoxRepr,
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}
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pub struct BoxRepr {
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header: BoxHeaderRepr,
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data: u8
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}
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}
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pub pure fn ptr_eq<T>(a: @T, b: @T) -> bool {
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//! Determine if two shared boxes point to the same object
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unsafe { ptr::addr_of(&(*a)) == ptr::addr_of(&(*b)) }
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}
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#[cfg(notest)]
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impl<T:Eq> @const T : Eq {
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pure fn eq(&self, other: &@const T) -> bool { *(*self) == *(*other) }
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pure fn ne(&self, other: &@const T) -> bool { *(*self) != *(*other) }
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}
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#[cfg(notest)]
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impl<T:Ord> @const T : Ord {
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pure fn lt(&self, other: &@const T) -> bool { *(*self) < *(*other) }
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pure fn le(&self, other: &@const T) -> bool { *(*self) <= *(*other) }
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pure fn ge(&self, other: &@const T) -> bool { *(*self) >= *(*other) }
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pure fn gt(&self, other: &@const T) -> bool { *(*self) > *(*other) }
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}
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#[test]
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fn test() {
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let x = @3;
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let y = @3;
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assert (ptr_eq::<int>(x, x));
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assert (ptr_eq::<int>(y, y));
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assert (!ptr_eq::<int>(x, y));
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assert (!ptr_eq::<int>(y, x));
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}
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