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7317ef5c
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体验新版 GitCode,发现更多精彩内容 >>
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7317ef5c
编写于
10月 21, 2014
作者:
K
Keegan McAllister
浏览文件
操作
浏览文件
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电子邮件补丁
差异文件
Add as_unsafe_cell() for Cell and RefCell
Fixes #18131.
上级
a10917a6
变更
2
隐藏空白更改
内联
并排
Showing
2 changed file
with
41 addition
and
0 deletion
+41
-0
src/libcore/cell.rs
src/libcore/cell.rs
+22
-0
src/libcoretest/cell.rs
src/libcoretest/cell.rs
+19
-0
未找到文件。
src/libcore/cell.rs
浏览文件 @
7317ef5c
...
@@ -191,6 +191,17 @@ pub fn set(&self, value: T) {
...
@@ -191,6 +191,17 @@ pub fn set(&self, value: T) {
*
self
.value
.get
()
=
value
;
*
self
.value
.get
()
=
value
;
}
}
}
}
/// Get a reference to the underlying `UnsafeCell`.
///
/// This can be used to circumvent `Cell`'s safety checks.
///
/// This function is `unsafe` because `UnsafeCell`'s field is public.
#[inline]
#[experimental]
pub
unsafe
fn
as_unsafe_cell
<
'a
>
(
&
'a
self
)
->
&
'a
UnsafeCell
<
T
>
{
&
self
.value
}
}
}
#[unstable
=
"waiting for `Clone` trait to become stable"
]
#[unstable
=
"waiting for `Clone` trait to become stable"
]
...
@@ -306,6 +317,17 @@ pub fn borrow_mut<'a>(&'a self) -> RefMut<'a, T> {
...
@@ -306,6 +317,17 @@ pub fn borrow_mut<'a>(&'a self) -> RefMut<'a, T> {
None
=>
fail
!
(
"RefCell<T> already borrowed"
)
None
=>
fail
!
(
"RefCell<T> already borrowed"
)
}
}
}
}
/// Get a reference to the underlying `UnsafeCell`.
///
/// This can be used to circumvent `RefCell`'s safety checks.
///
/// This function is `unsafe` because `UnsafeCell`'s field is public.
#[inline]
#[experimental]
pub
unsafe
fn
as_unsafe_cell
<
'a
>
(
&
'a
self
)
->
&
'a
UnsafeCell
<
T
>
{
&
self
.value
}
}
}
#[unstable
=
"waiting for `Clone` to become stable"
]
#[unstable
=
"waiting for `Clone` to become stable"
]
...
...
src/libcoretest/cell.rs
浏览文件 @
7317ef5c
...
@@ -127,3 +127,22 @@ fn clone_ref_updates_flag() {
...
@@ -127,3 +127,22 @@ fn clone_ref_updates_flag() {
}
}
assert
!
(
x
.try_borrow_mut
()
.is_some
());
assert
!
(
x
.try_borrow_mut
()
.is_some
());
}
}
#[test]
fn
as_unsafe_cell
()
{
let
c1
:
Cell
<
uint
>
=
Cell
::
new
(
0u
);
c1
.set
(
1u
);
assert_eq!
(
1u
,
unsafe
{
*
c1
.as_unsafe_cell
()
.get
()
});
let
c2
:
Cell
<
uint
>
=
Cell
::
new
(
0u
);
unsafe
{
*
c2
.as_unsafe_cell
()
.get
()
=
1u
;
}
assert_eq!
(
1u
,
c2
.get
());
let
r1
:
RefCell
<
uint
>
=
RefCell
::
new
(
0u
);
*
r1
.borrow_mut
()
=
1u
;
assert_eq!
(
1u
,
unsafe
{
*
r1
.as_unsafe_cell
()
.get
()
});
let
r2
:
RefCell
<
uint
>
=
RefCell
::
new
(
0u
);
unsafe
{
*
r2
.as_unsafe_cell
()
.get
()
=
1u
;
}
assert_eq!
(
1u
,
*
r2
.borrow
());
}
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