Method mutate_root

aiscript-arena/src/arena.rs:228–238

(&mut self, f: F)

    /// cost of an extra write barrier.
    #[inline]
    pub fn mutate_root<F, T>(&mut self, f: F) -> T
    where
        F: for<'gc> FnOnce(&'gc Mutation<'gc>, &'gc mut Root<'gc, R>) -> T,
    {
        self.context.root_barrier();
        unsafe {
            let mc: &'static Mutation<'_> = &*(self.context.mutation_context() as *const _);
            let root: &'static mut Root<'_, R> = &mut *(&mut self.root as *mut _);
            f(mc, root)
        }
    }

    #[inline]
    pub fn metrics(&self) -> &Metrics {