Method modify_byte_at

crates/commitlog/src/repo/mem/segment.rs:86–89

(&mut self, pos: usize, f: impl FnOnce(u8) -> u8)

    }

    pub fn modify_byte_at(&mut self, pos: usize, f: impl FnOnce(u8) -> u8) {
        let mut storage = self.storage.write().unwrap();
        storage.buf[pos] = f(storage.buf[pos])
    }

    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();