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体验新版 GitCode,发现更多精彩内容 >>
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a94b2cb0
编写于
9月 09, 2020
作者:
M
Mara Bos
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差异文件
Add safety docs about T's invariants in MaybeUninit::assume_init_drop.
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+13
-7
library/core/src/mem/maybe_uninit.rs
library/core/src/mem/maybe_uninit.rs
+13
-7
未找到文件。
library/core/src/mem/maybe_uninit.rs
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a94b2cb0
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@@ -580,17 +580,23 @@ pub unsafe fn assume_init_read(&self) -> T {
///
/// # Safety
///
/// Calling this when the content is not yet fully initialized causes undefined
/// behavior: it is up to the caller to guarantee that the `MaybeUninit<T>` really
/// is in an initialized state.
///
/// This function runs the destructor of the contained value in place.
/// Afterwards, the memory is considered uninitialized again, but remains unmodified.
/// It is up to the caller to guarantee that the `MaybeUninit<T>` really is
/// in an initialized state. Calling this when the content is not yet fully
/// initialized causes undefined behavior.
///
/// On top of that, all additional invariants of the type `T` must be
/// satisfied, as the `Drop` implementation of `T` (or its members) may
/// rely on this. For example, a `1`-initialized [`Vec<T>`] is considered
/// initialized (under the current implementation; this does not constitute
/// a stable guarantee) because the only requirement the compiler knows
/// about it is that the data pointer must be non-null. Dropping such a
/// `Vec<T>` however will cause undefined behaviour.
///
/// [`assume_init`]: MaybeUninit::assume_init
#[unstable(feature
=
"maybe_uninit_extra"
,
issue
=
"63567"
)]
pub
unsafe
fn
assume_init_drop
(
&
mut
self
)
{
// SAFETY: the caller must guarantee that `self` is initialized.
// SAFETY: the caller must guarantee that `self` is initialized and
// satisfies all invariants of `T`.
// Dropping the value in place is safe if that is the case.
unsafe
{
ptr
::
drop_in_place
(
self
.as_mut_ptr
())
}
}
...
...
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