feat: basic registry

src/core/mod.rs

@@ -1,3 +1,4 @@
 pub mod client;
 pub mod eventloop;
+pub mod registry;
 pub mod scenegraph;

src/core/registry.rs

@@ -0,0 +1,40 @@
+use anyhow::{anyhow, Result};
+use slab::{Iter, Slab};
+use std::sync::RwLock;
+
+struct Registry<T>(RwLock<Slab<T>>);
+
+impl<T> Registry<T> {
+	pub fn add(&self, t: T) -> Result<usize> {
+		Ok(self
+			.0
+			.write()
+			.ok()
+			.ok_or_else(|| anyhow!("Registry has been poisoned"))?
+			.insert(t))
+	}
+	pub fn iterate<F: FnOnce(Iter<'_, T>)>(&self, index: usize, closure: F) -> Result<()> {
+		closure(
+			self.0
+				.read()
+				.ok()
+				.ok_or_else(|| anyhow!("Registry has been poisoned"))?
+				.iter(),
+		);
+		Ok(())
+	}
+	pub fn remove(&self, index: usize) -> Result<T> {
+		Ok(self
+			.0
+			.write()
+			.ok()
+			.ok_or_else(|| anyhow!("Registry has been poisoned"))?
+			.remove(index))
+	}
+}
+
+impl<T> Default for Registry<T> {
+	fn default() -> Self {
+		Registry::<T>(RwLock::new(Slab::new()))
+	}
+}