Replace lazy_static! macro with once_cell #1711
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coolreader18
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Jan 27, 2020
vm/src/vm.rs
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| lazy_static! { | ||
| static ref REPR_GUARDS: Mutex<HashSet<usize>> = { Mutex::new(HashSet::new()) }; | ||
| } | ||
| static REPR_GUARDS: Lazy<Mutex<HashSet<usize>>> = Lazy::new(|| Mutex::new(HashSet::new())); |
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Could this be Lazy::default()?
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Unfortunately I don't think so. I don't see anything like that documented and throws a compile error
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Really? It looks like Default is implemented for Lazy<T: Default> here.
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Oh, maybe it's not a const fn. Could do Lazy::new(Mutex::default), though.
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Yup, that's it. But the latter strategy works
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once_cellis generally considered to be superior tolazy_staticnowadays since it doesn't require a macro and has some extra flexibility. The ongoing proposal to add lazy initialization to the stdlib basically copies theonce_cellAPI.rust-lang-nursery/lazy-static.rs#111
rust-lang/rfcs#2788