32 lines
822 B
Rust
32 lines
822 B
Rust
// Copyright 2016 lazy-static.rs Developers
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//
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// Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or
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// http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or
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// http://opensource.org/licenses/MIT>, at your option. This file may not be
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// copied, modified, or distributed except according to those terms.
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extern crate spin;
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use self::spin::Once;
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pub struct Lazy<T: Sync>(Once<T>);
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impl<T: Sync> Lazy<T> {
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pub const INIT: Self = Lazy(Once::INIT);
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#[inline(always)]
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pub fn get<F>(&'static self, builder: F) -> &T
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where F: FnOnce() -> T
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{
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self.0.call_once(builder)
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}
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}
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#[macro_export]
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#[doc(hidden)]
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macro_rules! __lazy_static_create {
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($NAME:ident, $T:ty) => {
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static $NAME: $crate::lazy::Lazy<$T> = $crate::lazy::Lazy::INIT;
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}
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}
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