COMPARISON.md

Feature	dyntable	thin_trait_object	cglue	abi_stable	vtable
Version	0.1.0	1.1.2	0.2.12	0.11.1	0.1.9
License	Apache-2.0	MIT/Apache-2.0	MIT	MIT/Apache-2.0	GPLv3
no-std support	✔️	✔️1	✔️	❌	✔️
Pointer Type	Fat	Thin	Fat	Fat	Fat
Supports References	✔️	❌	✔️	✔️	✔️
Non-Box Trait Containers	❌	❌	✔️	✔️	✔️
Custom Allocators	✔️	❌	❌	❌	❌
Uses Thunks2	By-Value Fns	Never	Always	Unknown	Always
Trait Bounds / Supertraits	✔️3	✔️4	❌	✔️5	❌
Trait Groups6	❌	❌	✔️	❌	❌
Trait Generics	✔️	❌	✔️	✔️	❌
Default Generics	✔️	❌	❌	✔️	❌
Trait Lifetime Generics	✔️	❌	❌	✔️	❌
Fn Generics	❌	❌	Panics	❌	❌
Fn Lifetime Generics	✔️	❌	✔️	✔️	❌
Upcasting	✔️	❌	❌	❌	❌
Downcasting	❌	❌	❌	✔️	✔️
Constants	❌	❌	❌	❌	✔️
Associated Types	❌	❌	✔️	✔️	❌
Field Offsets	❌	❌	❌	❌	✔️
Duplicate Trait Name	✔️	✔️	✔️	✔️	❌
Layout Validation	❌	❌	✔️	✔️	❌
Single Macro7	✔️	✔️	❌	✔️	❌
No Reborrowing8	❌	No Ref Types	❌	❌	❌

Footnotes

1. Thin-trait-object has no runtime component. ↩

2. Intermediary functions used for type conversion that cannot be inlined. ↩

3. Dyntable traits can only have bounds on other dyntable traits (without associated types) and Send or Sync. ↩

4. Requires manually writing impls and thunks for bound methods. ↩

5. Abi-Stable traits can only have bounds on a specific selection of traits (see abi_stable docs for details), ↩

6. Trait groups are non trait bound / supertrait based groupings of traits. See the cglue docs for details. ↩

7. Only one macro is required, on the trait definition. ↩

8. Reborrowing is when a reference is represented by an owned type, and needs to have a function called to borrow it. ↩