cfg

Struct DnfExpr

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pub struct DnfExpr { /* private fields */ }
Expand description

A #[cfg] directive in Disjunctive Normal Form (DNF).

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impl DnfExpr

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pub fn new(expr: &CfgExpr) -> Self

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pub fn why_inactive(&self, opts: &CfgOptions) -> Option<InactiveReason>

Computes a list of present or absent atoms in opts that cause this expression to evaluate to false.

Note that flipping a subset of these atoms might be sufficient to make the whole expression evaluate to true. For that, see compute_enable_hints.

Returns None when self is already true, or contains errors.

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pub fn compute_enable_hints<'a>( &'a self, opts: &'a CfgOptions, ) -> impl Iterator<Item = CfgDiff> + 'a

Returns CfgDiff objects that would enable this directive if applied to opts.

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impl Display for DnfExpr

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

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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>

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Calls U::from(self).

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

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fn into_box(self) -> Box<dyn Any>

Convert self into the appropriate boxed form.
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where T: Any + Send,

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fn into_box(self) -> Box<dyn Any + Send>

Convert self into the appropriate boxed form.
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where T: Any + Send + Sync,

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fn into_box(self) -> Box<dyn Any + Sync + Send>

Convert self into the appropriate boxed form.
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impl<T> IntoEither for T

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fn into_either(self, into_left: bool) -> Either<Self, Self>

Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
where F: FnOnce(&Self) -> bool,

Converts self into a Left variant of Either<Self, Self> if into_left(&self) returns true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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impl<T> ToString for T
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fn to_string(&self) -> String

Converts the given value to a String. Read more
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impl<T, U> TryFrom<U> for 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
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type Error = <U as TryFrom<T>>::Error

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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

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