<!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 to the Rust file `src/libcore/lib.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>lib.rs.html -- source</title><link rel="stylesheet" type="text/css" href="../../normalize1.35.0.css"><link rel="stylesheet" type="text/css" href="../../rustdoc1.35.0.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../dark1.35.0.css"><link rel="stylesheet" type="text/css" href="../../light1.35.0.css" id="themeStyle"><script src="../../storage1.35.0.js"></script><noscript><link rel="stylesheet" href="../../noscript1.35.0.css"></noscript><link rel="shortcut icon" href="../../favicon1.35.0.ico"><style type="text/css">#crate-search{background-image:url("../../down-arrow1.35.0.svg");}</style></head><body class="rustdoc source"><!--[if lte IE 8]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu">☰</div><a href='../../core/index.html'><img src='../../rust-logo1.35.0.png' alt='logo' width='100'></a></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!"><img src="../../brush1.35.0.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices"></div></div><script src="../../theme1.35.0.js"></script><nav class="sub"><form class="search-form js-only"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><a id="settings-menu" href="../../settings.html"><img src="../../wheel1.35.0.svg" width="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><pre class="line-numbers"><span id="1"> 1</span>
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</pre><div class="example-wrap"><pre class="rust ">
<span class="doccomment">//! # The Rust Core Library</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! The Rust Core Library is the dependency-free[^free] foundation of [The</span>
<span class="doccomment">//! Rust Standard Library](../std/index.html). It is the portable glue</span>
<span class="doccomment">//! between the language and its libraries, defining the intrinsic and</span>
<span class="doccomment">//! primitive building blocks of all Rust code. It links to no</span>
<span class="doccomment">//! upstream libraries, no system libraries, and no libc.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! [^free]: Strictly speaking, there are some symbols which are needed but</span>
<span class="doccomment">//! they aren't always necessary.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! The core library is *minimal*: it isn't even aware of heap allocation,</span>
<span class="doccomment">//! nor does it provide concurrency or I/O. These things require</span>
<span class="doccomment">//! platform integration, and this library is platform-agnostic.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! # How to use the core library</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Please note that all of these details are currently not considered stable.</span>
<span class="doccomment">//!</span>
<span class="comment">// FIXME: Fill me in with more detail when the interface settles</span>
<span class="doccomment">//! This library is built on the assumption of a few existing symbols:</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! * `memcpy`, `memcmp`, `memset` - These are core memory routines which are</span>
<span class="doccomment">//! often generated by LLVM. Additionally, this library can make explicit</span>
<span class="doccomment">//! calls to these functions. Their signatures are the same as found in C.</span>
<span class="doccomment">//! These functions are often provided by the system libc, but can also be</span>
<span class="doccomment">//! provided by the [compiler-builtins crate](https://crates.io/crates/compiler_builtins).</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! * `rust_begin_panic` - This function takes four arguments, a</span>
<span class="doccomment">//! `fmt::Arguments`, a `&'static str`, and two `u32`'s. These four arguments</span>
<span class="doccomment">//! dictate the panic message, the file at which panic was invoked, and the</span>
<span class="doccomment">//! line and column inside the file. It is up to consumers of this core</span>
<span class="doccomment">//! library to define this panic function; it is only required to never</span>
<span class="doccomment">//! return. This requires a `lang` attribute named `panic_impl`.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! * `rust_eh_personality` - is used by the failure mechanisms of the</span>
<span class="doccomment">//! compiler. This is often mapped to GCC's personality function, but crates</span>
<span class="doccomment">//! which do not trigger a panic can be assured that this function is never</span>
<span class="doccomment">//! called. The `lang` attribute is called `eh_personality`.</span>
<span class="comment">// Since libcore defines many fundamental lang items, all tests live in a</span>
<span class="comment">// separate crate, libcoretest, to avoid bizarre issues.</span>
<span class="comment">//</span>
<span class="comment">// Here we explicitly #[cfg]-out this whole crate when testing. If we don't do</span>
<span class="comment">// this, both the generated test artifact and the linked libtest (which</span>
<span class="comment">// transitively includes libcore) will both define the same set of lang items,</span>
<span class="comment">// and this will cause the E0152 "duplicate lang item found" error. See</span>
<span class="comment">// discussion in #50466 for details.</span>
<span class="comment">//</span>
<span class="comment">// This cfg won't affect doc tests.</span>
<span class="attribute">#![<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">test</span>))]</span>
<span class="attribute">#![<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"core"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.6.0"</span>)]</span>
<span class="attribute">#![<span class="ident">doc</span>(<span class="ident">html_root_url</span> <span class="op">=</span> <span class="string">"https://doc.rust-lang.org/nightly/"</span>,
<span class="ident">html_playground_url</span> <span class="op">=</span> <span class="string">"https://play.rust-lang.org/"</span>,
<span class="ident">issue_tracker_base_url</span> <span class="op">=</span> <span class="string">"https://github.com/rust-lang/rust/issues/"</span>,
<span class="ident">test</span>(<span class="ident">no_crate_inject</span>, <span class="ident">attr</span>(<span class="ident">deny</span>(<span class="ident">warnings</span>))),
<span class="ident">test</span>(<span class="ident">attr</span>(<span class="ident">allow</span>(<span class="ident">dead_code</span>, <span class="ident">deprecated</span>, <span class="ident">unused_variables</span>, <span class="ident">unused_mut</span>))))]</span>
<span class="attribute">#![<span class="ident">no_core</span>]</span>
<span class="attribute">#![<span class="ident">warn</span>(<span class="ident">deprecated_in_future</span>)]</span>
<span class="attribute">#![<span class="ident">warn</span>(<span class="ident">missing_docs</span>)]</span>
<span class="attribute">#![<span class="ident">warn</span>(<span class="ident">intra_doc_link_resolution_failure</span>)]</span>
<span class="attribute">#![<span class="ident">warn</span>(<span class="ident">missing_debug_implementations</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">allow_internal_unstable</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">arbitrary_self_types</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">asm</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">associated_type_defaults</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">cfg_target_has_atomic</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">concat_idents</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">const_fn</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">const_fn_union</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">custom_attribute</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">doc_cfg</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">doc_spotlight</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">extern_types</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">fundamental</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">intrinsics</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">is_sorted</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">iter_once_with</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">lang_items</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">link_llvm_intrinsics</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">never_type</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">nll</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">bind_by_move_pattern_guards</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">exhaustive_patterns</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">no_core</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">on_unimplemented</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">optin_builtin_traits</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">prelude_import</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">repr_simd</span>, <span class="ident">platform_intrinsics</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">rustc_attrs</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">rustc_const_unstable</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">simd_ffi</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">specialization</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">staged_api</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">std_internals</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">stmt_expr_attributes</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">unboxed_closures</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">unsized_locals</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">untagged_unions</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">unwind_attributes</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">doc_alias</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">mmx_target_feature</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">tbm_target_feature</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">sse4a_target_feature</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">arm_target_feature</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">powerpc_target_feature</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">mips_target_feature</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">aarch64_target_feature</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">wasm_target_feature</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">avx512_target_feature</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">cmpxchg16b_target_feature</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">const_slice_len</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">const_str_as_bytes</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">const_str_len</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">const_int_conversion</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">const_transmute</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">reverse_bits</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">non_exhaustive</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">structural_match</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">abi_unadjusted</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">adx_target_feature</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">maybe_uninit</span>, <span class="ident">maybe_uninit_slice</span>, <span class="ident">maybe_uninit_array</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">external_doc</span>)]</span>
<span class="attribute">#[<span class="ident">prelude_import</span>]</span>
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">unused</span>)]</span>
<span class="kw">use</span> <span class="ident">prelude</span>::<span class="ident">v1</span>::<span class="kw-2">*</span>;
<span class="attribute">#[<span class="ident">macro_use</span>]</span>
<span class="kw">mod</span> <span class="ident">macros</span>;
<span class="attribute">#[<span class="ident">macro_use</span>]</span>
<span class="kw">mod</span> <span class="ident">internal_macros</span>;
<span class="attribute">#[<span class="ident">path</span> <span class="op">=</span> <span class="string">"num/int_macros.rs"</span>]</span>
<span class="attribute">#[<span class="ident">macro_use</span>]</span>
<span class="kw">mod</span> <span class="ident">int_macros</span>;
<span class="attribute">#[<span class="ident">path</span> <span class="op">=</span> <span class="string">"num/uint_macros.rs"</span>]</span>
<span class="attribute">#[<span class="ident">macro_use</span>]</span>
<span class="kw">mod</span> <span class="ident">uint_macros</span>;
<span class="attribute">#[<span class="ident">path</span> <span class="op">=</span> <span class="string">"num/isize.rs"</span>]</span> <span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">isize</span>;
<span class="attribute">#[<span class="ident">path</span> <span class="op">=</span> <span class="string">"num/i8.rs"</span>]</span> <span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">i8</span>;
<span class="attribute">#[<span class="ident">path</span> <span class="op">=</span> <span class="string">"num/i16.rs"</span>]</span> <span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">i16</span>;
<span class="attribute">#[<span class="ident">path</span> <span class="op">=</span> <span class="string">"num/i32.rs"</span>]</span> <span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">i32</span>;
<span class="attribute">#[<span class="ident">path</span> <span class="op">=</span> <span class="string">"num/i64.rs"</span>]</span> <span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">i64</span>;
<span class="attribute">#[<span class="ident">path</span> <span class="op">=</span> <span class="string">"num/i128.rs"</span>]</span> <span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">i128</span>;
<span class="attribute">#[<span class="ident">path</span> <span class="op">=</span> <span class="string">"num/usize.rs"</span>]</span> <span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">usize</span>;
<span class="attribute">#[<span class="ident">path</span> <span class="op">=</span> <span class="string">"num/u8.rs"</span>]</span> <span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">u8</span>;
<span class="attribute">#[<span class="ident">path</span> <span class="op">=</span> <span class="string">"num/u16.rs"</span>]</span> <span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">u16</span>;
<span class="attribute">#[<span class="ident">path</span> <span class="op">=</span> <span class="string">"num/u32.rs"</span>]</span> <span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">u32</span>;
<span class="attribute">#[<span class="ident">path</span> <span class="op">=</span> <span class="string">"num/u64.rs"</span>]</span> <span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">u64</span>;
<span class="attribute">#[<span class="ident">path</span> <span class="op">=</span> <span class="string">"num/u128.rs"</span>]</span> <span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">u128</span>;
<span class="attribute">#[<span class="ident">path</span> <span class="op">=</span> <span class="string">"num/f32.rs"</span>]</span> <span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">f32</span>;
<span class="attribute">#[<span class="ident">path</span> <span class="op">=</span> <span class="string">"num/f64.rs"</span>]</span> <span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">f64</span>;
<span class="attribute">#[<span class="ident">macro_use</span>]</span>
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">num</span>;
<span class="comment">/* The libcore prelude, not as all-encompassing as the libstd prelude */</span>
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">prelude</span>;
<span class="comment">/* Core modules for ownership management */</span>
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">intrinsics</span>;
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">mem</span>;
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">ptr</span>;
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">hint</span>;
<span class="comment">/* Core language traits */</span>
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">marker</span>;
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">ops</span>;
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">cmp</span>;
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">clone</span>;
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">default</span>;
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">convert</span>;
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">borrow</span>;
<span class="comment">/* Core types and methods on primitives */</span>
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">any</span>;
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">array</span>;
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">ascii</span>;
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">sync</span>;
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">cell</span>;
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">char</span>;
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">panic</span>;
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">panicking</span>;
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">pin</span>;
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">iter</span>;
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">option</span>;
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">raw</span>;
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">result</span>;
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">ffi</span>;
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">slice</span>;
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">str</span>;
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">hash</span>;
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">fmt</span>;
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">time</span>;
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">unicode</span>;
<span class="comment">/* Async */</span>
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">future</span>;
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">task</span>;
<span class="comment">/* Heap memory allocator trait */</span>
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">missing_docs</span>)]</span>
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">alloc</span>;
<span class="comment">// note: does not need to be public</span>
<span class="kw">mod</span> <span class="ident">tuple</span>;
<span class="kw">mod</span> <span class="ident">unit</span>;
<span class="comment">// Pull in the `core_arch` crate directly into libcore. The contents of</span>
<span class="comment">// `core_arch` are in a different repository: rust-lang-nursery/stdsimd.</span>
<span class="comment">//</span>
<span class="comment">// `core_arch` depends on libcore, but the contents of this module are</span>
<span class="comment">// set up in such a way that directly pulling it here works such that the</span>
<span class="comment">// crate uses the this crate as its libcore.</span>
<span class="attribute">#[<span class="ident">path</span> <span class="op">=</span> <span class="string">"../stdsimd/crates/core_arch/src/mod.rs"</span>]</span>
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">missing_docs</span>, <span class="ident">missing_debug_implementations</span>, <span class="ident">dead_code</span>, <span class="ident">unused_imports</span>)]</span>
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"stdsimd"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"48556"</span>)]</span>
<span class="kw">mod</span> <span class="ident">core_arch</span>;
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"simd_arch"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.27.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">core_arch</span>::<span class="ident">arch</span>;
</pre></div>
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