[−][src]Struct ra_ap_hir_expand::db::ExpandProcMacroQuery
Implementations
impl ExpandProcMacroQuery
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pub fn in_db(self, db: &dyn AstDatabase) -> QueryTable<'_, Self>
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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 ExpandProcMacroQuery
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pub fn in_db_mut(self, db: &mut dyn AstDatabase) -> QueryTableMut<'_, Self>
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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 ExpandProcMacroQuery
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impl Default for ExpandProcMacroQuery
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fn default() -> ExpandProcMacroQuery
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impl Query for ExpandProcMacroQuery
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type Key = MacroCallId
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 = Result<Subtree, ExpandError>
What value does the query return?
type Storage = MemoizedStorage<Self>
Internal struct storing the values for the query.
const QUERY_INDEX: u16
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const QUERY_NAME: &'static str
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fn query_storage<'a>(
group_storage: &'a Self::GroupStorage
) -> &'a Arc<Self::Storage>
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group_storage: &'a Self::GroupStorage
) -> &'a Arc<Self::Storage>
impl<'d> QueryDb<'d> for ExpandProcMacroQuery
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type DynDb = dyn AstDatabase + 'd
Dyn version of the associated trait for this query group.
type Group = AstDatabaseStorage
Associate query group struct.
type GroupStorage = AstDatabaseGroupStorage__
Generated struct that contains storage for all queries in a group.
impl QueryFunction for ExpandProcMacroQuery
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Auto Trait Implementations
impl RefUnwindSafe for ExpandProcMacroQuery
impl Send for ExpandProcMacroQuery
impl Sync for ExpandProcMacroQuery
impl Unpin for ExpandProcMacroQuery
impl UnwindSafe for ExpandProcMacroQuery
Blanket Implementations
impl<T> Any for T where
T: 'static + ?Sized,
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T: 'static + ?Sized,
impl<T> Borrow<T> for T where
T: ?Sized,
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T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
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T: ?Sized,
pub fn borrow_mut(&mut self) -> &mut T
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impl<T> From<T> for T
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impl<T, U> Into<U> for T where
U: From<T>,
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U: From<T>,
impl<T, U> TryFrom<U> for T where
U: Into<T>,
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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>
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impl<T, U> TryInto<U> for T where
U: TryFrom<T>,
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U: TryFrom<T>,