bevy_utils

Small general utilities used by multiple Bevy crates. Keep this crate small — anything that grows to its own concept gets promoted to its own crate.

Purpose

Cross-crate helpers that don't fit cleanly elsewhere. Includes:

• default() function — equivalent to Default::default() but shorter.
• ParallelHashMap — concurrent map used by some scheduler internals.
• Once — fast static initialization helpers.
• Internal hashing helpers shared with bevy_platform.

Directory layout

crates/bevy_utils/src/
├── lib.rs
├── default.rs            # default() function
├── parallel_queue.rs     # Lock-free per-thread queues
├── once.rs               # Once-init helpers
├── short_names.rs        # Strip module paths from type names for display
├── synccell.rs, syncunsafecell.rs   # Sync wrappers for !Sync types
└── debug_info.rs         # Compile-time debug info helpers

Key abstractions

Type	File	Description
default()	crates/bevy_utils/src/default.rs	default() is shorter than Default::default().
Parallel<T>	crates/bevy_utils/src/parallel_queue.rs	Per-thread parallel queue.
OnceFlag	crates/bevy_utils/src/once.rs	Cheap once-shot flag.
get_short_name	crates/bevy_utils/src/short_names.rs	Strip generics/module paths from a type name.

Integration points

• Depends on: bevy_platform, sometimes tracing.
• Depended on by: Many crates. Treat it like a stdlib of small extras.

Entry points for modification

• Add new helpers sparingly. If a helper grows past ~100 lines or ties to a specific subsystem, consider splitting it into a dedicated crate.

See also

• bevy_platform — sister crate.