     1
     2
     3
     4
     5
     6
     7
     8
     9
    10
    11
    12
    13
    14
    15
    16
    17
    18
    19
    20
    21
    22
    23
    24
    25
    26
    27
    28
    29
    30
    31
    32
    33
    34
    35
    36
    37
    38
    39
    40

    // 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 std;

    use self::std::prelude::v1::*;
    use self::std::sync::Once;

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

    impl<T: Sync> Lazy<T> {
        #[inline(always)]
        pub fn get<F>(&'static mut self, f: F) -> &T
            where F: FnOnce() -> T
        {
            unsafe {
                let r = &mut self.0;
                self.1.call_once(|| {
                    *r = Box::into_raw(Box::new(f()));
                });

                &*self.0
            }
        }
    }

    unsafe impl<T: Sync> Sync for Lazy<T> {}

    #[macro_export]
    #[doc(hidden)]
    macro_rules! __lazy_static_create {
        ($NAME:ident, $T:ty) => {
            use std::sync::ONCE_INIT;
            static mut $NAME: $crate::lazy::Lazy<$T> = $crate::lazy::Lazy(0 as *const $T, ONCE_INIT);
        }
    }

# Help

## Keyboard Shortcuts

?
  Show this help dialog
S
  Focus the search field
⇤
  Move up in search results
⇥
  Move down in search results
⏎
  Go to active search result
+
  Collapse/expand all sections

## Search Tricks

Prefix searches with a type followed by a colon (e.g. `fn:`) to restrict the search to a given type.

Accepted types are: `fn`, `mod`, `struct`, `enum`, `trait`, `type`, `macro`, and `const`.

Search functions by type signature (e.g. `vec -> usize` or `* -> vec`)