Struct DependsCache

pub struct DependsCache<'g> { /* private fields */ }

An optional cache used to speed up depends_on queries.

Created with PackageGraph::new_depends_cache().

Implementations

impl<'g> DependsCache<'g>

pub fn new(package_graph: &'g PackageGraph) -> Self

Creates a new cache for depends_on queries for this package graph.

This holds a shared reference to the package graph. This is to ensure that the cache is invalidated if the package graph is mutated.

pub fn depends_on( &mut self, package_a: &PackageId, package_b: &PackageId, ) -> Result<bool, Error>

Returns true if package_a depends (directly or indirectly) on package_b.

In other words, this returns true if package_b is a (possibly transitive) dependency of package_a.

Trait Implementations

impl<'g> Clone for DependsCache<'g>

fn clone(&self) -> DependsCache<'g>

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<'g> Debug for DependsCache<'g>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.