Stepan Koltsov 6a3d20bb8d Optimize shallow_clone for Bytes::split_{off,to} (#92) ... If `shallow_clone` is called with `&mut self`, and `Bytes` contains `Vec`, then expensive CAS can be avoided, because no other thread have references to this `Bytes` object. Bench `split_off_and_drop` difference: Before the diff: ``` test split_off_and_drop ... bench: 91,858 ns/iter (+/- 17,401) ``` With the diff: ``` test split_off_and_drop ... bench: 81,162 ns/iter (+/- 17,603) ```		2018-01-03 11:41:33 -08:00
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bytes.rs	Optimize shallow_clone for Bytes::split_{off,to} (#92)	2018-01-03 11:41:33 -08:00