[−][src]Struct ra_ap_hir_def::db::BodyQuery
Implementations
impl BodyQuery[src]
pub fn in_db(self, db: &dyn DefDatabase) -> QueryTable<'_, Self>[src]
Get access to extra methods pertaining to this query. For
example, you can use this to run the GC (sweep) across a
single input. You can also use it to invoke this query, though
it's more common to use the trait method on the database
itself.
impl BodyQuery[src]
pub fn in_db_mut(self, db: &mut dyn DefDatabase) -> QueryTableMut<'_, Self>[src]
Like in_db, but gives access to methods for setting the
value of an input. Not applicable to derived queries.
Threads, cancellation, and blocking
Mutating the value of a query cannot be done while there are
still other queries executing. If you are using your database
within a single thread, this is not a problem: you only have
&self access to the database, but this method requires &mut self.
However, if you have used snapshot to create other threads,
then attempts to set will block the current thread until
those snapshots are dropped (usually when those threads
complete). This also implies that if you create a snapshot but
do not send it to another thread, then invoking set will
deadlock.
Before blocking, the thread that is attempting to set will
also set a cancellation flag. In the threads operating on
snapshots, you can use the is_current_revision_canceled
method to check for this flag and bring those operations to a
close, thus allowing the set to succeed. Ignoring this flag
may lead to "starvation", meaning that the thread attempting
to set has to wait a long, long time. =)
Trait Implementations
impl Debug for BodyQuery[src]
impl Default for BodyQuery[src]
impl Query for BodyQuery[src]
type Key = DefWithBodyId
Type that you you give as a parameter -- for queries with zero or more than one input, this will be a tuple. Read more
type Value = Arc<Body>
What value does the query return?
type Storage = MemoizedStorage<Self>
Internal struct storing the values for the query.
pub const QUERY_INDEX: u16[src]
pub const QUERY_NAME: &'static str[src]
pub fn query_storage<'a>(
group_storage: &'a Self::GroupStorage
) -> &'a Arc<Self::Storage>[src]
group_storage: &'a Self::GroupStorage
) -> &'a Arc<Self::Storage>
impl<'d> QueryDb<'d> for BodyQuery[src]
type DynDb = dyn DefDatabase + 'd
Dyn version of the associated trait for this query group.
type Group = DefDatabaseStorage
Associate query group struct.
type GroupStorage = DefDatabaseGroupStorage__
Generated struct that contains storage for all queries in a group.
impl QueryFunction for BodyQuery[src]
Auto Trait Implementations
impl RefUnwindSafe for BodyQuery[src]
impl Send for BodyQuery[src]
impl Sync for BodyQuery[src]
impl Unpin for BodyQuery[src]
impl UnwindSafe for BodyQuery[src]
Blanket Implementations
impl<T> Any for T where
T: 'static + ?Sized, [src]
T: 'static + ?Sized,
impl<T> Any for T where
T: Any, [src]
T: Any,
impl<T> Borrow<T> for T where
T: ?Sized, [src]
T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized, [src]
T: ?Sized,
pub fn borrow_mut(&mut self) -> &mut T[src]
impl<T> From<T> for T[src]
impl<T, U> Into<U> for T where
U: From<T>, [src]
U: From<T>,
impl<T, U> TryFrom<U> for T where
U: Into<T>, [src]
U: Into<T>,
type Error = Infallible
The type returned in the event of a conversion error.
pub fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>[src]
impl<T, U> TryInto<U> for T where
U: TryFrom<T>, [src]
U: TryFrom<T>,