Struct rustc_expand::mbe::macro_parser::MatcherPos
source · struct MatcherPos {
idx: usize,
matches: Lrc<Vec<NamedMatch>>,
}
Expand description
A single matcher position, representing the state of matching.
Fields
idx: usize
The index into TtParser::locs
, which represents the “dot”.
matches: Lrc<Vec<NamedMatch>>
The matches made against metavar decls so far. On a successful match, this vector ends up
with one element per metavar decl in the matcher. Each element records token trees matched
against the relevant metavar by the black box parser. An element will be a MatchedSeq
if
the corresponding metavar decl is within a sequence.
It is critical to performance that this is an Lrc
, because it gets cloned frequently when
processing sequences. Mostly for sequence-ending possibilities that must be tried but end
up failing.
Implementations
sourceimpl MatcherPos
impl MatcherPos
sourcefn push_match(&mut self, metavar_idx: usize, seq_depth: usize, m: NamedMatch)
fn push_match(&mut self, metavar_idx: usize, seq_depth: usize, m: NamedMatch)
Adds m
as a named match for the metavar_idx
-th metavar. There are only two call sites,
and both are hot enough to be always worth inlining.
Auto Trait Implementations
impl !RefUnwindSafe for MatcherPos
impl !Send for MatcherPos
impl !Sync for MatcherPos
impl Unpin for MatcherPos
impl !UnwindSafe for MatcherPos
Blanket Implementations
sourceimpl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
const: unstable · sourcefn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Layout
Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...)
attributes. Please see the Rust Reference’s “Type Layout” chapter for details on type layout guarantees.
Size: 16 bytes