Method try_map_root

aiscript-arena/src/arena.rs:185–202

(
        self,
        f: impl for<'gc> FnOnce(&'gc Mutation<'gc>, Root<'gc, R>) -> Result<Root<'gc, R2>, E>,
    )

    #[inline]
    pub fn try_map_root<R2, E>(
        self,
        f: impl for<'gc> FnOnce(&'gc Mutation<'gc>, Root<'gc, R>) -> Result<Root<'gc, R2>, E>,
    ) -> Result<Arena<R2>, E>
    where
        R2: for<'a> Rootable<'a>,
        for<'a> Root<'a, R2>: Sized,
    {
        self.context.root_barrier();
        let new_root: Root<'static, R2> = unsafe {
            let mc: &'static Mutation<'_> = &*(self.context.mutation_context() as *const _);
            f(mc, self.root)?
        };
        Ok(Arena {
            context: self.context,
            root: new_root,
        })
    }
}

impl<R> Arena<R>