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// Copyright 2016 lazy-static.rs Developers // // Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or // http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or // http://opensource.org/licenses/MIT>, at your option. This file may not be // copied, modified, or distributed except according to those terms. extern crate core; extern crate std; use self::std::prelude::v1::*; use self::std::cell::Cell; use self::std::hint::unreachable_unchecked; use self::std::sync::Once; #[allow(deprecated)] pub use self::std::sync::ONCE_INIT; // FIXME: Replace Option<T> with MaybeUninit<T> (stable since 1.36.0) pub struct Lazy<T: Sync>(Cell<Option<T>>, Once); impl<T: Sync> Lazy<T> { #[allow(deprecated)] pub const INIT: Self = Lazy(Cell::new(None), ONCE_INIT); #[inline(always)] pub fn get<F>(&'static self, f: F) -> &T where F: FnOnce() -> T, { self.1.call_once(|| { self.0.set(Some(f())); }); // `self.0` is guaranteed to be `Some` by this point // The `Once` will catch and propagate panics unsafe { match *self.0.as_ptr() { Some(ref x) => x, None => { debug_assert!(false, "attempted to derefence an uninitialized lazy static. This is a bug"); unreachable_unchecked() }, } } } } unsafe impl<T: Sync> Sync for Lazy<T> {} #[macro_export] #[doc(hidden)] macro_rules! __lazy_static_create { ($NAME:ident, $T:ty) => { static $NAME: $crate::lazy::Lazy<$T> = $crate::lazy::Lazy::INIT; }; }
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26 entries across 26 versions & 1 rubygems