Method modify_bytes_at

crates/commitlog/src/repo/mem/segment.rs:91–94

(&mut self, range: impl SliceIndex<[u8], Output = [u8]>, f: impl FnOnce(&mut [u8]))

    }

    pub fn modify_bytes_at(&mut self, range: impl SliceIndex<[u8], Output = [u8]>, f: impl FnOnce(&mut [u8])) {
        let mut storage = self.storage.write().unwrap();
        f(&mut storage.buf[range])
    }

    pub fn allocated_space(&self) -> u64 {
        self.storage.read().unwrap().alloc