pub struct FeatureQuery<'g> { /* private fields */ }
Expand description
A query over a feature graph.
A FeatureQuery
is the entry point for Cargo resolution, and also provides iterators over
feature IDs and links. This struct is constructed through the query_
methods on
FeatureGraph
, or through PackageQuery::to_feature_query
.
Implementations
sourceimpl<'g> FeatureQuery<'g>
impl<'g> FeatureQuery<'g>
sourcepub fn graph(&self) -> &FeatureGraph<'g>
pub fn graph(&self) -> &FeatureGraph<'g>
Returns the feature graph the query is going to be executed on.
sourcepub fn direction(&self) -> DependencyDirection
pub fn direction(&self) -> DependencyDirection
Returns the direction the query is happening in.
sourcepub fn initials<'a>(
&'a self
) -> impl Iterator<Item = FeatureMetadata<'g>> + ExactSizeIterator + 'a
pub fn initials<'a>(
&'a self
) -> impl Iterator<Item = FeatureMetadata<'g>> + ExactSizeIterator + 'a
Returns the list of initial features specified in the query.
The order of features is unspecified.
sourcepub fn initial_packages<'a>(
&'a self
) -> impl Iterator<Item = PackageMetadata<'g>> + 'a
pub fn initial_packages<'a>(
&'a self
) -> impl Iterator<Item = PackageMetadata<'g>> + 'a
Returns the list of initial packages specified in the query.
The order of packages is unspecified.
sourcepub fn starts_from_package(&self, package_id: &PackageId) -> Result<bool, Error>
pub fn starts_from_package(&self, package_id: &PackageId) -> Result<bool, Error>
Returns true if the query starts from the given package.
Returns an error if the package ID is unknown.
sourcepub fn starts_from<'a>(
&self,
feature_id: impl Into<FeatureId<'a>>
) -> Result<bool, Error>
pub fn starts_from<'a>(
&self,
feature_id: impl Into<FeatureId<'a>>
) -> Result<bool, Error>
Returns true if the query starts from the given feature ID.
Returns an error if this feature ID is unknown.
sourcepub fn resolve(self) -> FeatureSet<'g>
pub fn resolve(self) -> FeatureSet<'g>
Resolves this query into a set of known feature IDs.
This is the entry point for iterators.
sourcepub fn resolve_with(self, resolver: impl FeatureResolver<'g>) -> FeatureSet<'g>
pub fn resolve_with(self, resolver: impl FeatureResolver<'g>) -> FeatureSet<'g>
Resolves this query into a set of known feature IDs, using the provided resolver to determine which links are followed.
sourcepub fn resolve_with_fn(
self,
resolver_fn: impl FnMut(&FeatureQuery<'g>, ConditionalLink<'g>) -> bool
) -> FeatureSet<'g>
pub fn resolve_with_fn(
self,
resolver_fn: impl FnMut(&FeatureQuery<'g>, ConditionalLink<'g>) -> bool
) -> FeatureSet<'g>
Resolves this query into a set of known feature IDs, using the provided resolver function to determine which links are followed.
Trait Implementations
sourceimpl<'g> Clone for FeatureQuery<'g>
impl<'g> Clone for FeatureQuery<'g>
sourcefn clone(&self) -> FeatureQuery<'g>
fn clone(&self) -> FeatureQuery<'g>
Returns a copy of the value. Read more
1.0.0 · sourcefn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
Performs copy-assignment from source
. Read more
Auto Trait Implementations
impl<'g> RefUnwindSafe for FeatureQuery<'g>
impl<'g> Send for FeatureQuery<'g>
impl<'g> Sync for FeatureQuery<'g>
impl<'g> Unpin for FeatureQuery<'g>
impl<'g> UnwindSafe for FeatureQuery<'g>
Blanket Implementations
sourceimpl<T> BorrowMut<T> for T where
T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
const: unstable · sourcefn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more
impl<T> Pointable for T
impl<T> Pointable for T
sourceimpl<T> ToOwned for T where
T: Clone,
impl<T> ToOwned for T where
T: Clone,
type Owned = T
type Owned = T
The resulting type after obtaining ownership.
sourcefn clone_into(&self, target: &mut T)
fn clone_into(&self, target: &mut T)
toowned_clone_into
)Uses borrowed data to replace owned data, usually by cloning. Read more