lazy_static/
core_lazy.rs

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1// Copyright 2016 lazy-static.rs Developers
2//
3// Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or
4// https://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or
5// https://opensource.org/licenses/MIT>, at your option. This file may not be
6// copied, modified, or distributed except according to those terms.
7
8extern crate spin;
9
10use self::spin::Once;
11
12pub struct Lazy<T: Sync>(Once<T>);
13
14impl<T: Sync> Lazy<T> {
15    pub const INIT: Self = Lazy(Once::INIT);
16
17    #[inline(always)]
18    pub fn get<F>(&'static self, builder: F) -> &T
19    where
20        F: FnOnce() -> T,
21    {
22        self.0.call_once(builder)
23    }
24}
25
26#[macro_export]
27#[doc(hidden)]
28macro_rules! __lazy_static_create {
29    ($NAME:ident, $T:ty) => {
30        static $NAME: $crate::lazy::Lazy<$T> = $crate::lazy::Lazy::INIT;
31    };
32}
lazy_static/core_lazy.rs

lazy_static/
core_lazy.rs
