cargo::core::resolver::dep_cache

# Struct RegistryQueryer

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    pub struct RegistryQueryer<'a> {
        pub registry: &'a mut (dyn Registry + 'a),
        replacements: &'a [(PackageIdSpec, Dependency)],
        version_prefs: &'a VersionPreferences,
        registry_cache: HashMap<(Dependency, Option<VersionOrdering>), Poll<Rc<Vec<Summary>>>>,
        summary_cache: HashMap<(Option<PackageId>, Summary, ResolveOpts), (Rc<(HashSet<InternedString>, Rc<Vec<(Dependency, Rc<Vec<Summary>>, Rc<BTreeSet<InternedString>>)>>)>, bool)>,
        used_replacements: HashMap<PackageId, Summary>,
    }

## Fields§

§`registry: &'a mut (dyn Registry + 'a)`§`replacements: &'a [(PackageIdSpec, Dependency)]`§`version_prefs: &'a VersionPreferences`§`registry_cache: HashMap<(Dependency, Option<VersionOrdering>), Poll<Rc<Vec<Summary>>>>`

a cache of `Candidate`s that fulfil a `Dependency` (and whether `first_version`)

§`summary_cache: HashMap<(Option<PackageId>, Summary, ResolveOpts), (Rc<(HashSet<InternedString>, Rc<Vec<(Dependency, Rc<Vec<Summary>>, Rc<BTreeSet<InternedString>>)>>)>, bool)>`

a cache of `Dependency`s that are required for a `Summary`

HACK: `first_version` is not kept in the cache key is it is 1:1 with `parent.is_none()` (the first element of the cache key) as it doesn’t change through execution.

§`used_replacements: HashMap<PackageId, Summary>`

all the cases we ended up using a supplied replacement

## Implementations§

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### impl<'a> RegistryQueryer<'a>

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#### pub fn new( registry: &'a mut dyn Registry, replacements: &'a [(PackageIdSpec, Dependency)], version_prefs: &'a VersionPreferences, ) -> Self

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#### pub fn reset_pending(&mut self) -> bool

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#### pub fn used_replacement_for( &self, p: PackageId, ) -> Option<(PackageId, PackageId)>

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#### pub fn replacement_summary(&self, p: PackageId) -> Option<&Summary>

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#### pub fn query( &mut self, dep: &Dependency, first_version: Option<VersionOrdering>, ) -> Poll<CargoResult<Rc<Vec<Summary>>>>

Queries the `registry` to return a list of candidates for `dep`.

This method is the location where overrides are taken into account. If any candidates are returned which match an override then the override is applied by performing a second query for what the override should return.

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#### pub fn build_deps( &mut self, cx: &ResolverContext, parent: Option<PackageId>, candidate: &Summary, opts: &ResolveOpts, first_version: Option<VersionOrdering>, ) -> ActivateResult<Rc<(HashSet<InternedString>, Rc<Vec<(Dependency, Rc<Vec<Summary>>, Rc<BTreeSet<InternedString>>)>>)>>

Find out what dependencies will be added by activating `candidate`, with features described in `opts`. Then look up in the `registry` the candidates that will fulfil each of these dependencies, as it is the next obvious question.

## Auto Trait Implementations§

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### impl<'a> Freeze for RegistryQueryer<'a>

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### impl<'a> !RefUnwindSafe for RegistryQueryer<'a>

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### impl<'a> !Send for RegistryQueryer<'a>

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### impl<'a> !Sync for RegistryQueryer<'a>

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### impl<'a> Unpin for RegistryQueryer<'a>

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### impl<'a> !UnwindSafe for RegistryQueryer<'a>

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## 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: 184 bytes