# Struct cargo::core::resolver::features::FeatureOpts

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    pub struct FeatureOpts {
        decouple_host_deps: bool,
        decouple_dev_deps: bool,
        ignore_inactive_targets: bool,
        compare: bool,
    }

Expand description

Options for how the feature resolver works.

## Fields§

§`decouple_host_deps: bool`

Build deps and proc-macros will not share features with other dep kinds, and so won’t artifact targets. In other terms, if true, features associated with certain kinds of dependencies will only be unified together. If false, there is only one namespace for features, unifying all features across all dependencies, no matter what kind.

§`decouple_dev_deps: bool`

Dev dep features will not be activated unless needed.

§`ignore_inactive_targets: bool`

Targets that are not in use will not activate features.

§`compare: bool`

If enabled, compare against old resolver (for testing).

## Implementations§

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### impl FeatureOpts

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#### pub fn new( ws: &Workspace<'_>, has_dev_units: HasDevUnits, force_all_targets: ForceAllTargets ) -> CargoResult<FeatureOpts>

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#### pub fn new_behavior( behavior: ResolveBehavior, has_dev_units: HasDevUnits ) -> FeatureOpts

Creates a new FeatureOpts for the given behavior.

## Trait Implementations§

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### impl Default for FeatureOpts

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#### fn default() -> FeatureOpts

Returns the “default value” for a type. Read more

## Auto Trait Implementations§

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### impl RefUnwindSafe for FeatureOpts

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### impl Send for FeatureOpts

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### impl Sync for FeatureOpts

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### impl Unpin for FeatureOpts

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### impl UnwindSafe for FeatureOpts

## Blanket Implementations§

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### impl<T> Any for Twhere 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 Twhere 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 Twhere 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> 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 Twhere 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> Same<T> for T

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#### type Output = T

Should always be `Self`
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### impl<T, U> TryFrom<U> for Twhere 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 Twhere 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 Twhere V: MultiLane<T>,

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#### fn vzip(self) -> V

## 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:4 bytes