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Contents
// Copyright 2016 lazy-static.rs Developers
//
// Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or
// https://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or
// https://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::cell::Cell;
use self::std::mem::MaybeUninit;
use self::std::prelude::v1::*;
use self::std::sync::Once;
#[allow(deprecated)]
pub use self::std::sync::ONCE_INIT;
#[allow(dead_code)] // Used in macros
pub struct Lazy<T: Sync>(Cell<MaybeUninit<T>>, Once);
impl<T: Sync> Lazy<T> {
#[allow(deprecated)]
pub const INIT: Self = Lazy(Cell::new(MaybeUninit::uninit()), ONCE_INIT);
#[inline(always)]
pub fn get<F>(&'static self, f: F) -> &T
where
F: FnOnce() -> T,
{
self.1.call_once(|| {
self.0.set(MaybeUninit::new(f()));
});
// `self.0` is guaranteed to be initialized by this point
// The `Once` will catch and propagate panics
unsafe { &*(*self.0.as_ptr()).as_ptr() }
}
}
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;
};
}
Version data entries
12 entries across 12 versions & 1 rubygems