Enum rustdoc::clean::cfg::Cfg

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pub(crate) enum Cfg {
    True,
    False,
    Cfg(Symbol, Option<Symbol>),
    Not(Box<Cfg>),
    Any(Vec<Cfg>),
    All(Vec<Cfg>),
}

Variants§

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True

Accepts all configurations.

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False

Denies all configurations.

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Cfg(Symbol, Option<Symbol>)

A generic configuration option, e.g., test or target_os = "linux".

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Not(Box<Cfg>)

Negates a configuration requirement, i.e., not(x).

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Any(Vec<Cfg>)

Union of a list of configuration requirements, i.e., any(...).

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All(Vec<Cfg>)

Intersection of a list of configuration requirements, i.e., all(...).

Implementations§

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impl Cfg

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fn parse_nested( nested_cfg: &NestedMetaItem, exclude: &FxHashSet<Cfg> ) -> Result<Option<Cfg>, InvalidCfgError>

Parses a NestedMetaItem into a Cfg.

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pub(crate) fn parse_without( cfg: &MetaItem, exclude: &FxHashSet<Cfg> ) -> Result<Option<Cfg>, InvalidCfgError>

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pub(crate) fn parse(cfg: &MetaItem) -> Result<Cfg, InvalidCfgError>

Parses a MetaItem into a Cfg.

The MetaItem should be the content of the #[cfg(...)], e.g., unix or target_os = "redox".

If the content is not properly formatted, it will return an error indicating what and where the error is.

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pub(crate) fn matches( &self, parse_sess: &ParseSess, features: Option<&Features> ) -> bool

Checks whether the given configuration can be matched in the current session.

Equivalent to attr::cfg_matches.

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fn is_simple(&self) -> bool

Whether the configuration consists of just Cfg or Not.

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fn is_all(&self) -> bool

Whether the configuration consists of just Cfg, Not or All.

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pub(crate) fn render_short_html(&self) -> String

Renders the configuration for human display, as a short HTML description.

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pub(crate) fn render_long_html(&self) -> String

Renders the configuration for long display, as a long HTML description.

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pub(crate) fn render_long_plain(&self) -> String

Renders the configuration for long display, as a long plain text description.

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fn should_capitalize_first_letter(&self) -> bool

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fn should_append_only_to_description(&self) -> bool

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fn should_use_with_in_description(&self) -> bool

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pub(crate) fn simplify_with(&self, assume: &Cfg) -> Option<Cfg>

Attempt to simplify this cfg by assuming that assume is already known to be true, will return None if simplification managed to completely eliminate any requirements from this Cfg.

See tests::test_simplify_with for examples.

Trait Implementations§

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impl BitAnd for Cfg

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type Output = Cfg

The resulting type after applying the & operator.
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fn bitand(self, other: Cfg) -> Cfg

Performs the & operation. Read more
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impl BitAndAssign for Cfg

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fn bitand_assign(&mut self, other: Cfg)

Performs the &= operation. Read more
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impl BitOr for Cfg

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type Output = Cfg

The resulting type after applying the | operator.
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fn bitor(self, other: Cfg) -> Cfg

Performs the | operation. Read more
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impl BitOrAssign for Cfg

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fn bitor_assign(&mut self, other: Cfg)

Performs the |= operation. Read more
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impl Clone for Cfg

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fn clone(&self) -> Cfg

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for Cfg

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl Hash for Cfg

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fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher. Read more
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fn hash_slice<H>(data: &[Self], state: &mut H)
where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher. Read more
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impl Not for Cfg

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type Output = Cfg

The resulting type after applying the ! operator.
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fn not(self) -> Cfg

Performs the unary ! operation. Read more
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impl PartialEq for Cfg

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fn eq(&self, other: &Cfg) -> bool

This method tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl Eq for Cfg

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impl StructuralPartialEq for Cfg

Auto Trait Implementations§

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impl DynSend for Cfg

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impl DynSync for Cfg

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impl RefUnwindSafe for Cfg

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impl Send for Cfg

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impl Sync for Cfg

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impl Unpin for Cfg

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impl UnwindSafe for Cfg

Blanket Implementations§

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impl<T> Aligned for T

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const ALIGN: Alignment = _

Alignment of Self.
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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> AnyEq for T
where T: Any + PartialEq,

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fn equals(&self, other: &(dyn Any + 'static)) -> bool

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fn as_any(&self) -> &(dyn Any + 'static)

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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T, R> CollectAndApply<T, R> for T

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fn collect_and_apply<I, F>(iter: I, f: F) -> R
where I: Iterator<Item = T>, F: FnOnce(&[T]) -> R,

Equivalent to f(&iter.collect::<Vec<_>>()).

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type Output = R

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impl<Q, K> Equivalent<K> for Q
where Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

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fn equivalent(&self, key: &K) -> bool

Checks if this value is equivalent to the given key. Read more
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impl<Q, K> Equivalent<K> for Q
where Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

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fn equivalent(&self, key: &K) -> bool

Checks if this value is equivalent to the given key. Read more
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impl<Q, K> Equivalent<K> for Q
where Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

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fn equivalent(&self, key: &K) -> bool

Compare self to key and return true if they are equal.
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impl<Q, K> Equivalent<K> for Q
where Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

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fn equivalent(&self, key: &K) -> bool

Checks if this value is equivalent to the given key. Read more
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impl<Q, K> Equivalent<K> for Q
where Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

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fn equivalent(&self, key: &K) -> bool

Compare self to key and return true if they are equal.
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impl<T> Filterable for T

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fn filterable( self, filter_name: &'static str ) -> RequestFilterDataProvider<T, fn(_: DataRequest<'_>) -> bool>

Creates a filterable data provider with the given name for debugging. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T> Instrument for T

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fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more
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fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more
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impl<T> Instrument for T

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fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more
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fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more
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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<P> IntoQueryParam<P> for P

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impl<T> MaybeResult<T> for T

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type Error = !

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fn from(_: Result<T, <T as MaybeResult<T>>::Error>) -> T

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fn to_result(self) -> Result<T, <T as MaybeResult<T>>::Error>

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impl<T> Pointable for T

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const ALIGN: usize = _

The alignment of pointer.
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type Init = T

The type for initializers.
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unsafe fn init(init: <T as Pointable>::Init) -> usize

Initializes a with the given initializer. Read more
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unsafe fn deref<'a>(ptr: usize) -> &'a T

Dereferences the given pointer. Read more
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unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T

Mutably dereferences the given pointer. Read more
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unsafe fn drop(ptr: usize)

Drops the object pointed to by the given pointer. Read more
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impl<T> Same for T

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type Output = T

Should always be Self
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impl<T> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<'tcx, T> ToPredicate<'tcx, T> for T

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fn to_predicate(self, _tcx: TyCtxt<'tcx>) -> T

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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<V, T> VZip<V> for T
where V: MultiLane<T>,

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fn vzip(self) -> V

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impl<Tcx, T> Value<Tcx> for T
where Tcx: DepContext,

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default fn from_cycle_error( tcx: Tcx, cycle_error: &CycleError, _guar: ErrorGuaranteed ) -> T

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impl<T> WithSubscriber for T

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fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
where S: Into<Dispatch>,

Attaches the provided Subscriber to this type, returning a WithDispatch wrapper. Read more
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fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more
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impl<T> WithSubscriber for T

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fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
where S: Into<Dispatch>,

Attaches the provided Subscriber to this type, returning a WithDispatch wrapper. Read more
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fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more
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impl<'a, T> Captures<'a> for T
where T: ?Sized,

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impl<'a, T> Captures<'a> for T
where T: ?Sized,

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impl<T> ErasedDestructor for T
where T: 'static,

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impl<T> MaybeSendSync for T
where T: Send + Sync,

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: 32 bytes

Size for each variant:

  • True: 0 bytes
  • False: 0 bytes
  • Cfg: 8 bytes
  • Not: 12 bytes
  • Any: 28 bytes
  • All: 28 bytes