[−][src]Struct cfg::history::NullHistory
A history which carries no data. All operations on NullHistory
are no-op.
Trait Implementations
impl Action for NullHistory
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impl Binarize for NullHistory
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impl EliminateNulling for NullHistory
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fn eliminate_nulling<R>(&self, _rule: &R, _which: BinarizedRhsSubset) -> Self
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impl AssignPrecedence for NullHistory
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fn assign_precedence<R>(&self, _rule: &R, _looseness: u32) -> Self
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impl RewriteSequence for NullHistory
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type Rewritten = Self
Must be an Action
, because all created grammar rules except the topmost one will have no-op semantic action. Read more
fn top(&self, _rhs: Symbol, _sep: Option<Symbol>, _new: &[Symbol]) -> Self
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fn bottom(&self, _rhs: Symbol, _sep: Option<Symbol>, _new: &[Symbol]) -> Self
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impl HistorySource<NullHistory> for NullHistorySource
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impl Clone for NullHistory
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fn clone(&self) -> NullHistory
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fn clone_from(&mut self, source: &Self)
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impl Copy for NullHistory
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impl Default for NullHistory
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fn default() -> NullHistory
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impl Debug for NullHistory
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Auto Trait Implementations
impl Send for NullHistory
impl Sync for NullHistory
impl Unpin for NullHistory
impl UnwindSafe for NullHistory
impl RefUnwindSafe for NullHistory
Blanket Implementations
impl<T, U> Into<U> for T where
U: From<T>,
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U: From<T>,
impl<T> From<T> for T
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impl<T> ToOwned for T where
T: Clone,
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T: Clone,
type Owned = T
The resulting type after obtaining ownership.
fn to_owned(&self) -> T
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fn clone_into(&self, target: &mut T)
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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.
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>,
type Error = <U as TryFrom<T>>::Error
The type returned in the event of a conversion error.
fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>
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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,
fn borrow_mut(&mut self) -> &mut T
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impl<T> Any for T where
T: 'static + ?Sized,
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T: 'static + ?Sized,