164 lines
20 KiB
Plaintext
164 lines
20 KiB
Plaintext
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rust
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ÁM #rustc 1.93.0 (254b59607 2026-01-19)Á³VOÐêùÿ²?ÑL¼�§Ì± -a7a40eb546f9e2b0Á “õ…·fÊvŠ ¦%g- -c48c539199cbc88bÁ á\ƒ¦è3$|]åŒ[IÚ tæ -14b12edc9f8cd90bÁ ë&Gf·Ã ¬ëñq:¤»b -bb76018b1173caf6Áà 9m Ù„«ÐÒþá•c‘B; -030c5b0bba47cc8fÁ rustc_std_workspace_coreÁÛ¹þÓ7>H%¸ÚÉ’› -4b81d37a5530864dÁ üÃùs<Uß7VyóHr#QÏ -c66cc7807550ce25Á miniz_oxideÁõFÖˆÚ™ª‹"ÞXzLVª -62cbc7af83058505Á adler2Á—wÉD‘嵯�|6¨%Œ
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+ -2f171dd2394b4b62Á hashbrownÁ,ïcV¼¨ø¢:Ê\'È߈ -9571ba9e0f6c7a90Á rustc_std_workspace_allocÁ%¥Èxµù·¼5Ä3Bœ -aac566ad65903fa4Á
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std_detectÁMmáýZ^9õ Îà§e˜÷e -2edb296e590136d8Á rustc_demangleÁ@¼§VÉNb˜æ¨fHÌ+V3 -53b132e4a2fa6e26Á cfg_ifÁfÝv�.Å"ÒÜuPp¹ˆ¶ -f76b385d7d4d7f3eÁ addr2lineÁÕú-WiúQVÓ¬
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µT§�5 -fe25100bd73e48e4Á gimliÁ¹xLáÇí÷‘o ±Ñ8£Å -265ba9e6e4f70b3fÁ objectÁÔ³ÝzÓÿ¶ò°öM›¼òü` -9ae0d1f8ea52a318Á memchrÁRÎ÷׎™te~QÓ¿ØC\Ò -0bff3c8e8f4e489eÁ –©H�tGNÏ ·ˆ!á -d69228d077d46f36Á doc_commentÁ\Û «<· ³ lazyÁ ³ “ LazyÁ
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™ ì í ™ INITÁ getÁ FÁ ™ __lazy_static_createÁ __lazy_static_internalÁ lazy_staticÁ
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LazyStaticÁ
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initializeÁ Ü ™
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B I W
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» r ~ … ‰ Ž �
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— ž ³O ý¤Ú __DerefÁ<Ü ì œ ´¦ ¹ \Ù% üØä. üØŽ ‰
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A macro for declaring lazily evaluated statics.
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Using this macro, it is possible to have `static`s that require code to be
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executed at runtime in order to be initialized.
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This includes anything requiring heap allocations, like vectors or hash maps,
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as well as anything that requires function calls to be computed.
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# Syntax
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```ignore
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lazy_static! {
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[pub] static ref NAME_1: TYPE_1 = EXPR_1;
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[pub] static ref NAME_2: TYPE_2 = EXPR_2;
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...
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[pub] static ref NAME_N: TYPE_N = EXPR_N;
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}
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```
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Attributes (including doc comments) are supported as well:
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```rust
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use lazy_static::lazy_static;
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# fn main() {
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lazy_static! {
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/// This is an example for using doc comment attributes
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static ref EXAMPLE: u8 = 42;
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}
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# }
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```
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# Semantics
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For a given `static ref NAME: TYPE = EXPR;`, the macro generates a unique type that
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implements `Deref<TYPE>` and stores it in a static with name `NAME`. (Attributes end up
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attaching to this type.)
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On first deref, `EXPR` gets evaluated and stored internally, such that all further derefs
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can return a reference to the same object. Note that this can lead to deadlocks
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if you have multiple lazy statics that depend on each other in their initialization.
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Apart from the lazy initialization, the resulting "static ref" variables
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have generally the same properties as regular "static" variables:
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- Any type in them needs to fulfill the `Sync` trait.
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- If the type has a destructor, then it will not run when the process exits.
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# Example
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Using the macro:
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```rust
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use lazy_static::lazy_static;
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use std::collections::HashMap;
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lazy_static! {
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static ref HASHMAP: HashMap<u32, &'static str> = {
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let mut m = HashMap::new();
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m.insert(0, "foo");
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m.insert(1, "bar");
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m.insert(2, "baz");
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m
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};
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static ref COUNT: usize = HASHMAP.len();
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static ref NUMBER: u32 = times_two(21);
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}
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fn times_two(n: u32) -> u32 { n * 2 }
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fn main() {
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println!("The map has {} entries.", *COUNT);
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println!("The entry for `0` is \"{}\".", HASHMAP.get(&0).unwrap());
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println!("A expensive calculation on a static results in: {}.", *NUMBER);
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}
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```
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# Implementation details
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The `Deref` implementation uses a hidden static variable that is guarded by an atomic check on each access.
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# Cargo features
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This crate provides one cargo feature:
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- `spin_no_std`: This allows using this crate in a no-std environment, by depending on the standalone `spin` crate.
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Á¡ ë î ¢ 8¹ lï ý 7 !https://docs.rs/lazy_static/1.5.0Á üÿ# üè< ³Ó ýU
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À M
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ì œ L
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¹ K
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