Struct Rebuild 

pub struct Rebuild(Arc<dyn Fn(&ResourceGraph) -> Resource>);

A recipe that builds a resource out of the graph it lives in.

A node that can be rebuilt is inserted with one — ResourceGraph::insert — and ResourceGraph::maintain calls it whenever the node is dirty. The recipe reads whatever it was built from back out of the graph by ResHandle, so it always sees the current handle of its inputs rather than a copy captured when it was written.

The closure runs while the graph is borrowed immutably, so it can only read the graph: a recipe returns the handle it built and the graph writes it into the node.

Tuple Fields

0: Arc<dyn Fn(&ResourceGraph) -> Resource>

Implementations

impl Rebuild

pub fn new(rebuild: impl Fn(&ResourceGraph) -> Resource + 'static) -> Self

Wrap rebuild as a reusable recipe.

Only a resource that can be built purely from what the graph holds can be rebuilt lazily; the closure captures the device and the layout it needs on its own.

pub fn build<R: ResourceKind>(&self, graph: &ResourceGraph) -> R

Build the resource from the graph’s current state.

ResourceGraph::maintain calls this for a dirty node, but a caller can also use it to build the first instance eagerly, when it has to hold the resource before the next maintain.

Panics

If the recipe builds a resource of a different kind than R names. A recipe only ever builds the kind its node stores, so this is a programming error.

Trait Implementations

impl Clone for Rebuild

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Rebuild

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

Formats the value using the given formatter.