# Struct cargo::core::resolver::version_prefs::VersionPreferences

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    pub struct VersionPreferences {
        try_to_use: HashSet<PackageId>,
        prefer_patch_deps: HashMap<InternedString, HashSet<Dependency>>,
        version_ordering: VersionOrdering,
        max_rust_version: Option<RustVersion>,
    }

Expand description

A collection of preferences for particular package versions.

This is built up with `Self::prefer_package_id` and `Self::prefer_dependency`, then used to sort the set of summaries for a package during resolution via `Self::sort_summaries`.

As written, a version is either “preferred” or “not preferred”. Later extensions may introduce more granular preferences.

## Fields§

§`try_to_use: HashSet<PackageId>`§`prefer_patch_deps: HashMap<InternedString, HashSet<Dependency>>`§`version_ordering: VersionOrdering`§`max_rust_version: Option<RustVersion>`

## Implementations§

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### impl VersionPreferences

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#### pub fn prefer_package_id(&mut self, pkg_id: PackageId)

Indicate that the given package (specified as a `PackageId`) should be preferred.

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#### pub fn prefer_dependency(&mut self, dep: Dependency)

Indicate that the given package (specified as a `Dependency`) should be preferred.

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#### pub fn version_ordering(&mut self, ordering: VersionOrdering)

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#### pub fn max_rust_version(&mut self, ver: Option<RustVersion>)

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#### pub fn sort_summaries( &self, summaries: &mut Vec<Summary>, first_version: Option<VersionOrdering> )

Sort (and filter) the given vector of summaries in-place

Note: all summaries presumed to be for the same package.

Sort order:

1. Preferred packages
2. `VersionPreferences::max_rust_version`
3. `first_version`, falling back to `VersionPreferences::version_ordering` when `None`

Filtering:

- `first_version`

## Trait Implementations§

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### impl Default for VersionPreferences

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#### fn default() -> VersionPreferences

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

## Auto Trait Implementations§

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### impl RefUnwindSafe for VersionPreferences

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### impl !Send for VersionPreferences

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### impl !Sync for VersionPreferences

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### impl Unpin for VersionPreferences

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### impl UnwindSafe for VersionPreferences

## 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> 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, 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> 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, 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<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

## 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: 160 bytes