algorithm 0.1.18

about algorithm data structure, now has ttl with lru/lru-k/lfu/arc and slab/rbtree/roaring_bitmap/timer_wheelss, 关于算法常用的数据结构
Documentation 
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use std::time::SystemTime;

#[inline(always)]
pub fn get_timestamp() -> u64 {
    SystemTime::now().duration_since(SystemTime::UNIX_EPOCH).expect("ok").as_secs()
}

#[inline(always)]
pub fn get_milltimestamp() -> u64 {
    SystemTime::now().duration_since(SystemTime::UNIX_EPOCH).expect("ok").as_millis() as u64
}