# core_lazy.rs - source
Source of the Rust file `/home/runner/.cargo/registry/src/github.com-1ecc6299db9ec823/lazy_static-1.4.0/src/core_lazy.rs`.
Keywords: rust, rustlang, rust-lang

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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 spin;

    use self::spin::Once;

    pub struct Lazy<T: Sync>(Once<T>);

    impl<T: Sync> Lazy<T> {
        pub const INIT: Self = Lazy(Once::INIT);

        #[inline(always)]
        pub fn get<F>(&'static self, builder: F) -> &T
            where F: FnOnce() -> T
        {
            self.0.call_once(builder)
        }
    }

    #[macro_export]
    #[doc(hidden)]
    macro_rules! __lazy_static_create {
        ($NAME:ident, $T:ty) => {
            static $NAME: $crate::lazy::Lazy<$T> = $crate::lazy::Lazy::INIT;
        }
    }