forked from Orchid/orchid
Lawrence Bethlenfalvy
0bcf10659b
- InertAtomic replaced atomic_inert! for improved tooling support - atomic_defaults! is easier to type out than to explain in a docstring - Changed rustfmt config to better support tiny functions such as as_any
30 lines
855 B
Rust
30 lines
855 B
Rust
//! A variant of [std::any::Provider]
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use std::any::Any;
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/// A request for a value of an unknown type
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pub struct Request<'a>(&'a mut dyn Any);
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impl<'a> Request<'a> {
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pub fn can_serve<T: 'static>(&self) -> bool { self.0.is::<Option<T>>() }
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pub fn serve<T: 'static>(&mut self, value: T) { self.serve_with(|| value) }
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pub fn serve_with<T: 'static>(&mut self, provider: impl FnOnce() -> T) {
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if let Some(slot) = self.0.downcast_mut() {
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*slot = provider();
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}
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}
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}
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/// Trait for objects that can respond to type-erased commands. This trait is
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/// a dependency of `Atomic` but the implementation can be left empty.
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pub trait Responder {
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fn respond(&self, _request: Request) {}
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}
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pub fn request<T: 'static>(responder: &(impl Responder + ?Sized)) -> Option<T> {
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let mut slot = None;
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responder.respond(Request(&mut slot));
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slot
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}
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