80 lines
2.0 KiB
Rust
80 lines
2.0 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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#[cfg(not(test))] use cmp::*;
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/// Returns the refcount of a shared box (as just before calling this)
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#[inline]
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pub fn refcount<T>(t: @T) -> uint {
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use raw::Repr;
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unsafe { (*t.repr()).ref_count - 1 }
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}
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/// Determine if two shared boxes point to the same object
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#[inline]
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pub fn ptr_eq<T>(a: @T, b: @T) -> bool {
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&*a as *T == &*b as *T
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}
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#[cfg(not(test))]
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impl<T:Eq> Eq for @T {
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#[inline]
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fn eq(&self, other: &@T) -> bool { *(*self) == *(*other) }
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#[inline]
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fn ne(&self, other: &@T) -> bool { *(*self) != *(*other) }
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}
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#[cfg(not(test))]
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impl<T:Ord> Ord for @T {
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#[inline]
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fn lt(&self, other: &@T) -> bool { *(*self) < *(*other) }
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#[inline]
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fn le(&self, other: &@T) -> bool { *(*self) <= *(*other) }
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#[inline]
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fn ge(&self, other: &@T) -> bool { *(*self) >= *(*other) }
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#[inline]
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fn gt(&self, other: &@T) -> bool { *(*self) > *(*other) }
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}
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#[cfg(not(test))]
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impl<T: TotalOrd> TotalOrd for @T {
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#[inline]
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fn cmp(&self, other: &@T) -> Ordering { (**self).cmp(*other) }
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}
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#[cfg(not(test))]
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impl<T: TotalEq> TotalEq for @T {
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#[inline]
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fn equals(&self, other: &@T) -> bool { (**self).equals(*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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#[test]
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fn refcount_test() {
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use clone::Clone;
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let x = @3;
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assert_eq!(refcount(x), 1);
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let y = x.clone();
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assert_eq!(refcount(x), 2);
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assert_eq!(refcount(y), 2);
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}
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