Enum guppy::platform::PlatformSpec

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#[non_exhaustive]
pub enum PlatformSpec { Always, Platform(Arc<Platform>), Any, }
Expand description

A specifier for a single platform, or for a range of platforms.

Some uses of guppy care about a single platform, and others care about queries against the intersection of all hypothetical platforms, or against a union of any of them. PlatformSpec handles the

PlatformSpec does not currently support expressions, but it might in the future, using an SMT solver.

Variants (Non-exhaustive)§

This enum is marked as non-exhaustive
Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.
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Always

The intersection of all platforms.

Dependency queries performed against this variant will return EnabledTernary::Enabled if and only if a dependency is not platform-dependent. They can never return EnabledTernary::Unknown.

This variant does not currently understand expressions that always evaluate to true (tautologies), like cfg(any(unix, not(unix))) or cfg(all()). In the future, an SMT solver would be able to handle such expressions.

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Platform(Arc<Platform>)

An individual platform.

Dependency queries performed against this variant will return EnabledTernary::Enabled if and only if a dependency is enabled on this platform. They may also return EnabledTernary::Unknown if a platform is not enabled.

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Any

The union of all platforms.

Dependency queries performed against this variant will return EnabledTernary::Enabled if a dependency is enabled on any platform.

This variant does not currently understand expressions that always evaluate to false (contradictions), like cfg(all(unix, not(unix))) or cfg(any()). In the future, an SMT solver would be able to handle such expressions.

Implementations§

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impl PlatformSpec

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pub fn current() -> Result<Self, TargetSpecError>

Returns a PlatformSpec corresponding to the current platform, as detected at build time.

Returns an error if the current platform was unknown to the version of target-spec in use.

Trait Implementations§

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impl Clone for PlatformSpec

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fn clone(&self) -> PlatformSpec

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 PlatformSpec

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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: Into<Arc<Platform>>> From<T> for PlatformSpec

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fn from(platform: T) -> Self

Converts to this type from the input type.

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, 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.