Attribute Macro tinydyn 

#[tinydyn]

Marks a local trait as tinydyn-aware, letting it be used inside of Ref and RefMut.

This implements DynTrait and PlainDyn for the targeted trait object. This defines an alternate smaller vtable layout that erases layout and drop information.

While you can use tinydyn-aware traits as regular dyn Trait trait objects, it’s not recommended as it creates two vtables.

Example

use tinydyn::{self, tinydyn};

#[tinydyn]
trait Foo {
    fn blah(&self) -> i32;
    fn blue(&self) -> i32 { 10 }
}

impl Foo for i32 {
    fn blah(&self) -> i32 { *self + 1 }
}

// Use `dyn Foo` to reference the trait `Foo` even though it never creates the
// regular vtable for `dyn Foo`.
let x: tinydyn::Ref<dyn Foo> = Ref::new(&15);
assert_eq!(x.blah(), 16);
assert_eq!(x.blue(), 10);

This trait is tinydyn-compatible.