#![no_std] support

Cargo.toml

@@ -9,11 +9,12 @@ repository = "https://github.com/actuate-rs/actuate"
 [features]
 animation = ["ecs", "dep:bevy_math", "dep:bevy_time"]
 ecs = ["dep:bevy_app", "dep:bevy_ecs", "dep:bevy_hierarchy", "dep:bevy_utils"]
-executor = []
+executor = ["std", "dep:tokio"]
 rt = ["executor", "tokio/rt-multi-thread"]
+std = []
 tracing = ["dep:tracing"]
 full = ["animation", "ecs", "rt", "tracing"]
-default = []
+default = ["std"]
 
 [workspace]
 members = [
@@ -23,16 +24,20 @@ members = [
 
 [dependencies]
 actuate-macros = { version = "0.1.6", path = "macros" }
+ahash = { version = "0.8.11", default-features = false }
 bevy_app = { version = "0.15.0", optional = true }
 bevy_ecs = { version = "0.15.0", optional = true }
 bevy_hierarchy = { version = "0.15.0", optional = true }
 bevy_math = { version = "0.15.0", optional = true }
 bevy_time = { version = "0.15.0", optional = true }
 bevy_utils = { version = "0.15.0", optional = true }
+crossbeam-queue = { version = "0.3.11", default-features = false, features = ["alloc"] }
+futures = "0.3.31"
+hashbrown = "0.15.2"
 slotmap = "1.0.7"
 thiserror = "2.0.3"
 tracing = { version = "0.1.40", optional = true }
-tokio = { version = "1.41.1", features = ["sync"] }
+tokio = { version = "1.41.1", features = ["sync"], optional = true }
 typeid = "1.0.2"
 
 [dev-dependencies]

examples/core/composer.rs

@@ -32,6 +32,7 @@ fn main() {
     .unwrap();
 
     let mut composer = Composer::new(App);
-    composer.compose().unwrap();
-    composer.compose().unwrap();
+    composer.try_compose().unwrap().unwrap();
+
+    assert!(composer.try_compose().is_none());
 }

examples/core/error_handling.rs

@@ -35,5 +35,5 @@ fn main() {
     .unwrap();
 
     let mut composer = Composer::new(App);
-    assert!(composer.compose().is_ok());
+    assert!(composer.try_compose().unwrap().is_ok());
 }

src/animation.rs

@@ -17,10 +17,10 @@ struct State<T> {
 }
 
 /// Use an animated value.
-pub fn use_animated<T: VectorSpace + 'static>(
-    cx: ScopeState,
-    make_initial: impl FnOnce() -> T,
-) -> UseAnimated<T> {
+pub fn use_animated<T>(cx: ScopeState, make_initial: impl FnOnce() -> T) -> UseAnimated<T>
+where
+    T: VectorSpace + Send + 'static,
+{
     let start_cell = use_world_once(cx, |time: Res<Time>| Cell::new(Some(time.elapsed_secs())));
 
     let (controller, rx) = use_ref(cx, || {

src/compose.rs

@@ -1,7 +1,7 @@
 use crate::{prelude::*, Memoize, ScopeData};
-use std::{
+use alloc::borrow::Cow;
+use core::{
     any::TypeId,
-    borrow::Cow,
     cell::{RefCell, UnsafeCell},
     error::Error as StdError,
     mem,
@@ -32,7 +32,7 @@ pub trait Compose: Data {
 
     #[doc(hidden)]
     fn name() -> Option<Cow<'static, str>> {
-        let name = std::any::type_name::<Self>();
+        let name = core::any::type_name::<Self>();
         Some(
             name.split('<')
                 .next()
@@ -91,7 +91,7 @@ impl<C: Compose> Compose for Option<C> {
 /// This can be handled by a parent composable with [`Catch`].
 #[derive(Data)]
 pub struct Error {
-    make_error: Box<dyn Fn() -> Box<dyn std::error::Error>>,
+    make_error: Box<dyn Fn() -> Box<dyn core::error::Error>>,
 }
 
 impl Error {
@@ -483,7 +483,7 @@ where
     }
 
     unsafe fn reborrow(&mut self, ptr: *mut ()) {
-        std::ptr::swap(self, ptr as _);
+        core::ptr::swap(self, ptr as _);
     }
 
     unsafe fn any_compose(&self, state: &ScopeData) {