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体验新版 GitCode,发现更多精彩内容 >>
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c04563e1
编写于
11月 19, 2018
作者:
N
Niko Matsakis
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电子邮件补丁
差异文件
add some comments about lifetimes etc
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1db71931
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src/librustc/ty/util.rs
src/librustc/ty/util.rs
+18
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src/librustc/ty/util.rs
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c04563e1
...
...
@@ -621,6 +621,13 @@ pub fn is_static(&self, def_id: DefId) -> Option<hir::Mutability> {
}
impl
<
'a
,
'tcx
>
ty
::
TyS
<
'tcx
>
{
/// Checks whether values of this type `T` are *moved* or *copied*
/// when referenced -- this amounts to a check for whether `T:
/// Copy`, but note that we **don't** consider lifetimes when
/// doing this check. This means that we may generate MIR which
/// does copies even when the type actually doesn't satisfy the
/// full requirements for the `Copy` trait (cc #29149) -- this
/// winds up being reported as an error during NLL borrow check.
pub
fn
moves_by_default
(
&
'tcx
self
,
tcx
:
TyCtxt
<
'a
,
'tcx
,
'tcx
>
,
param_env
:
ty
::
ParamEnv
<
'tcx
>
,
...
...
@@ -629,6 +636,12 @@ pub fn moves_by_default(&'tcx self,
!
tcx
.at
(
span
)
.is_copy_raw
(
param_env
.and
(
self
))
}
/// Checks whether values of this type `T` have a size known at
/// compile time (i.e., whether `T: Sized`). Lifetimes are ignored
/// for the purposes of this check, so it can be an
/// over-approximation in generic contexts, where one can have
/// strange rules like `<T as Foo<'static>>::Bar: Sized` that
/// actually carry lifetime requirements.
pub
fn
is_sized
(
&
'tcx
self
,
tcx_at
:
TyCtxtAt
<
'a
,
'tcx
,
'tcx
>
,
param_env
:
ty
::
ParamEnv
<
'tcx
>
)
->
bool
...
...
@@ -636,6 +649,11 @@ pub fn is_sized(&'tcx self,
tcx_at
.is_sized_raw
(
param_env
.and
(
self
))
}
/// Checks whether values of this type `T` implement the `Freeze`
/// trait -- frozen types are those that do not contain a
/// `UnsafeCell` anywhere. This is a language concept used to
/// determine how to handle `static` values, the trait itself is
/// not exposed to end users.
pub
fn
is_freeze
(
&
'tcx
self
,
tcx
:
TyCtxt
<
'a
,
'tcx
,
'tcx
>
,
param_env
:
ty
::
ParamEnv
<
'tcx
>
,
...
...
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