<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/home/sangenya/.cargo/registry/src/github.com-1ecc6299db9ec823/lazy_static-1.4.0/src/inline_lazy.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>inline_lazy.rs - source</title><link rel="stylesheet" type="text/css" href="../../normalize.css"><link rel="stylesheet" type="text/css" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../light.css" id="themeStyle"><link rel="stylesheet" type="text/css" href="../../dark.css" disabled ><link rel="stylesheet" type="text/css" href="../../ayu.css" disabled ><script id="default-settings"></script><script src="../../storage.js"></script><script src="../../crates.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="icon" type="image/svg+xml" href="../../favicon.svg">
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</pre><pre class="rust">
<span class="comment">// Copyright 2016 lazy-static.rs Developers</span>
<span class="comment">//</span>
<span class="comment">// Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or</span>
<span class="comment">// http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or</span>
<span class="comment">// http://opensource.org/licenses/MIT>, at your option. This file may not be</span>
<span class="comment">// copied, modified, or distributed except according to those terms.</span>
<span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">core</span>;
<span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">std</span>;
<span class="kw">use</span> <span class="self">self</span><span class="ident">::std::prelude::v1</span>::<span class="kw-2">*</span>;
<span class="kw">use</span> <span class="self">self</span><span class="ident">::std::cell::Cell</span>;
<span class="kw">use</span> <span class="self">self</span><span class="ident">::std::hint::unreachable_unchecked</span>;
<span class="kw">use</span> <span class="self">self</span><span class="ident">::std::sync::Once</span>;
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">deprecated</span>)]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="self">self</span><span class="ident">::std::sync::ONCE_INIT</span>;
<span class="comment">// FIXME: Replace Option<T> with MaybeUninit<T> (stable since 1.36.0)</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Lazy</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Sync</span><span class="op">></span>(<span class="ident">Cell</span><span class="op"><</span><span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">T</span><span class="op">></span><span class="op">></span>, <span class="ident">Once</span>);
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Sync</span><span class="op">></span> <span class="ident">Lazy</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">deprecated</span>)]</span>
<span class="kw">pub</span> <span class="kw">const</span> <span class="ident">INIT</span>: <span class="self">Self</span> <span class="op">=</span> <span class="ident">Lazy</span>(<span class="ident">Cell::new</span>(<span class="prelude-val">None</span>), <span class="ident">ONCE_INIT</span>);
<span class="attribute">#[<span class="ident">inline</span>(<span class="ident">always</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">get</span><span class="op"><</span><span class="ident">F</span><span class="op">></span>(<span class="kw-2">&</span><span class="lifetime">'static</span> <span class="self">self</span>, <span class="ident">f</span>: <span class="ident">F</span>) <span class="op">-</span><span class="op">></span> <span class="kw-2">&</span><span class="ident">T</span>
<span class="kw">where</span>
<span class="ident">F</span>: <span class="ident">FnOnce</span>() <span class="op">-</span><span class="op">></span> <span class="ident">T</span>,
{
<span class="self">self</span>.<span class="number">1</span>.<span class="ident">call_once</span>(<span class="op">|</span><span class="op">|</span> {
<span class="self">self</span>.<span class="number">0</span>.<span class="ident">set</span>(<span class="prelude-val">Some</span>(<span class="ident">f</span>()));
});
<span class="comment">// `self.0` is guaranteed to be `Some` by this point</span>
<span class="comment">// The `Once` will catch and propagate panics</span>
<span class="kw">unsafe</span> {
<span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span>.<span class="number">0</span>.<span class="ident">as_ptr</span>() {
<span class="prelude-val">Some</span>(<span class="kw-2">ref</span> <span class="ident">x</span>) <span class="op">=</span><span class="op">></span> <span class="ident">x</span>,
<span class="prelude-val">None</span> <span class="op">=</span><span class="op">></span> {
<span class="macro">debug_assert!</span>(<span class="bool-val">false</span>, <span class="string">"attempted to derefence an uninitialized lazy static. This is a bug"</span>);
<span class="ident">unreachable_unchecked</span>()
},
}
}
}
}
<span class="kw">unsafe</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Sync</span><span class="op">></span> <span class="ident">Sync</span> <span class="kw">for</span> <span class="ident">Lazy</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {}
<span class="attribute">#[<span class="ident">macro_export</span>]</span>
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
<span class="macro">macro_rules!</span> <span class="ident">__lazy_static_create</span> {
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">NAME</span>:<span class="ident">ident</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">T</span>:<span class="ident">ty</span>) <span class="op">=</span><span class="op">></span> {
<span class="kw">static</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">NAME</span>: <span class="macro-nonterminal">$</span><span class="kw">crate</span><span class="macro-nonterminal">::lazy::Lazy</span><span class="op"><</span><span class="macro-nonterminal">$</span><span class="macro-nonterminal">T</span><span class="op">></span> <span class="op">=</span> <span class="macro-nonterminal">$</span><span class="kw">crate</span><span class="macro-nonterminal">::lazy::Lazy::INIT</span>;
};
}
</pre></div>
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