Struct target_spec::TargetSpecExpression

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

A target expression, parsed from a string beginning with cfg(.

For more information, see TargetSpec.

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impl TargetSpecExpression

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pub fn new(input: &str) -> Result<Self, ExpressionParseError>

Creates a new TargetSpecExpression from a string beginning with cfg(.

Returns an error if the string could not be parsed, or if the string contains a predicate that wasn’t understood by target-spec.

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pub fn expression_str(&self) -> &str

Returns the string that was parsed into self.

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pub fn eval(&self, platform: &Platform) -> Option<bool>

Evaluates this expression against the given platform.

Returns Some(true) if there’s a match, Some(false) if there’s none, or None if the result of the evaluation is unknown (typically found if target features are involved).

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impl Clone for TargetSpecExpression

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fn clone(&self) -> TargetSpecExpression

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 TargetSpecExpression

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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 Display for TargetSpecExpression

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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 FromStr for TargetSpecExpression

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type Err = ExpressionParseError

The associated error which can be returned from parsing.
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fn from_str(input: &str) -> Result<Self, Self::Err>

Parses a string s to return a value of this type. Read more

Auto Trait Implementations§

Blanket Implementations§

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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> 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> CloneToUninit for T
where T: Clone,

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default unsafe fn clone_to_uninit(&self, dst: *mut T)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dst. 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, 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<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<T> ToString for T
where T: Display + ?Sized,

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default 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
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.