1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
|
// 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.
//! Operations on managed box types
use ptr;
#[cfg(notest)] use cmp::{Eq, Ord};
pub mod raw {
use intrinsic::TyDesc;
pub static RC_EXCHANGE_UNIQUE : uint = (-1) as uint;
pub static RC_MANAGED_UNIQUE : uint = (-2) as uint;
pub static RC_IMMORTAL : uint = 0x77777777;
pub struct BoxHeaderRepr {
ref_count: uint,
type_desc: *TyDesc,
prev: *BoxRepr,
next: *BoxRepr,
}
pub struct BoxRepr {
header: BoxHeaderRepr,
data: u8
}
}
#[inline(always)]
pub 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)) }
}
#[inline(always)]
pub fn mut_ptr_eq<T>(a: @mut T, b: @mut T) -> bool {
//! Determine if two mutable shared boxes point to the same object
unsafe { ptr::addr_of(&(*a)) == ptr::addr_of(&(*b)) }
}
#[cfg(notest)]
impl<T:Eq> Eq for @T {
#[inline(always)]
fn eq(&self, other: &@T) -> bool { *(*self) == *(*other) }
#[inline(always)]
fn ne(&self, other: &@T) -> bool { *(*self) != *(*other) }
}
#[cfg(notest)]
impl<T:Eq> Eq for @mut T {
#[inline(always)]
fn eq(&self, other: &@mut T) -> bool { *(*self) == *(*other) }
#[inline(always)]
fn ne(&self, other: &@mut T) -> bool { *(*self) != *(*other) }
}
#[cfg(notest)]
impl<T:Ord> Ord for @T {
#[inline(always)]
fn lt(&self, other: &@T) -> bool { *(*self) < *(*other) }
#[inline(always)]
fn le(&self, other: &@T) -> bool { *(*self) <= *(*other) }
#[inline(always)]
fn ge(&self, other: &@T) -> bool { *(*self) >= *(*other) }
#[inline(always)]
fn gt(&self, other: &@T) -> bool { *(*self) > *(*other) }
}
#[cfg(notest)]
impl<T:Ord> Ord for @mut T {
#[inline(always)]
fn lt(&self, other: &@mut T) -> bool { *(*self) < *(*other) }
#[inline(always)]
fn le(&self, other: &@mut T) -> bool { *(*self) <= *(*other) }
#[inline(always)]
fn ge(&self, other: &@mut T) -> bool { *(*self) >= *(*other) }
#[inline(always)]
fn gt(&self, other: &@mut 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)));
}
|
