Module stdlib

Re-exports either the Rust std library or core and alloc when std is disabled.

crate::stdlib::... should be used rather than std:: when adding code that will be available with the standard library disabled.

Note that this module is called stdlib rather than std, as Rust 1.34.0 does not permit redefining the name stdlib (although this works on the latest stable Rust).

Modules

alloc 🔒

Memory allocation APIs.

any 🔒

Utilities for dynamic typing or type reflection.

arch 🔒

SIMD and vendor intrinsics module.

array 🔒

Utilities for the array primitive type.

ascii 🔒

Operations on ASCII strings and characters.

backtrace 🔒

Support for capturing a stack backtrace of an OS thread

borrow 🔒

A module for working with borrowed data.

boxed 🔒

The Box<T> type for heap allocation.

cell 🔒

Shareable mutable containers.

char 🔒

Utilities for the char primitive type.

clone 🔒

The Clone trait for types that cannot be ‘implicitly copied’.

cmp 🔒

Utilities for comparing and ordering values.

collections 🔒

Collection types.

convert 🔒

Traits for conversions between types.

default 🔒

The Default trait for types with a default value.

env 🔒

Inspection and manipulation of the process’s environment.

error 🔒

Interfaces for working with Errors.

f32 🔒

Constants for the f32 single-precision floating point type.

f64 🔒

Constants for the f64 double-precision floating point type.

ffi 🔒

Utilities related to FFI bindings.

fmt 🔒

Utilities for formatting and printing Strings.

fs 🔒

Filesystem manipulation operations.

future 🔒

Asynchronous basic functionality.

hash 🔒

Generic hashing support.

hint 🔒

Hints to compiler that affects how code should be emitted or optimized.

i8 🔒 Deprecation planned

Redundant constants module for the i8 primitive type.

i16 🔒 Deprecation planned

Redundant constants module for the i16 primitive type.

i32 🔒 Deprecation planned

Redundant constants module for the i32 primitive type.

i64 🔒 Deprecation planned

Redundant constants module for the i64 primitive type.

i128 🔒 Deprecation planned

Redundant constants module for the i128 primitive type.

io 🔒

Traits, helpers, and type definitions for core I/O functionality.

isize 🔒 Deprecation planned

Redundant constants module for the isize primitive type.

iter 🔒

Composable external iteration.

marker 🔒

Primitive traits and types representing basic properties of types.

mem 🔒

Basic functions for dealing with memory.

net 🔒

Networking primitives for TCP/UDP communication.

num 🔒

Additional functionality for numerics.

ops 🔒

Overloadable operators.

option 🔒

Optional values.

os 🔒

OS-specific functionality.

panic 🔒

Panic support in the standard library.

path 🔒

Cross-platform path manipulation.

pin 🔒

Types that pin data to a location in memory.

prelude 🔒

The Rust Prelude

primitive 🔒

This module reexports the primitive types to allow usage that is not possibly shadowed by other declared types.

process 🔒

A module for working with processes.

ptr 🔒

Manually manage memory through raw pointers.

rc 🔒

Single-threaded reference-counting pointers. ‘Rc’ stands for ‘Reference Counted’.

result 🔒

Error handling with the Result type.

slice 🔒

Utilities for the slice primitive type.

str 🔒

Utilities for the str primitive type.

string 🔒

A UTF-8–encoded, growable string.

sync 🔒

Useful synchronization primitives.

task 🔒

Types and Traits for working with asynchronous tasks.

thread 🔒

Native threads.

time 🔒

Temporal quantification.

u8 🔒 Deprecation planned

Redundant constants module for the u8 primitive type.

u16 🔒 Deprecation planned

Redundant constants module for the u16 primitive type.

u32 🔒 Deprecation planned

Redundant constants module for the u32 primitive type.

u64 🔒 Deprecation planned

Redundant constants module for the u64 primitive type.

u128 🔒 Deprecation planned

Redundant constants module for the u128 primitive type.

usize 🔒 Deprecation planned

Redundant constants module for the usize primitive type.

vec 🔒

A contiguous growable array type with heap-allocated contents, written Vec<T>.

assert_matches 🔒 Experimental

Unstable module containing the unstable assert_matches macro.

async_iter 🔒 Experimental

Composable asynchronous iteration.

autodiff 🔒 Experimental

This module provides support for automatic differentiation.

bstr 🔒 Experimental

The ByteStr and ByteString types and trait implementations.

f16 🔒 Experimental

Constants for the f16 half-precision floating point type.

f128 🔒 Experimental

Constants for the f128 quadruple-precision floating point type.

intrinsics 🔒 Experimental

Compiler intrinsics.

pat 🔒 Experimental

Helper module for exporting the pattern_type macro

random 🔒 Experimental

Random value generation.

range 🔒 Experimental

Experimental replacement range types

simd 🔒 Experimental

Portable SIMD module.

unsafe_binder 🔒 Experimental

Operators used to turn types into unsafe binders and back.

Macros

assert 🔒

Asserts that a boolean expression is true at runtime.

assert_eq 🔒

Asserts that two expressions are equal to each other (using PartialEq).

assert_ne 🔒

Asserts that two expressions are not equal to each other (using PartialEq).

cfg 🔒

Evaluates boolean combinations of configuration flags at compile-time.

column 🔒

Expands to the column number at which it was invoked.

compile_error 🔒

Causes compilation to fail with the given error message when encountered.

concat 🔒

Concatenates literals into a static string slice.

dbg 🔒

Prints and returns the value of a given expression for quick and dirty debugging.

debug_assert 🔒

Asserts that a boolean expression is true at runtime.

debug_assert_eq 🔒

Asserts that two expressions are equal to each other.

debug_assert_ne 🔒

Asserts that two expressions are not equal to each other.

env 🔒

Inspects an environment variable at compile time.

eprint 🔒

Prints to the standard error.

eprintln 🔒

Prints to the standard error, with a newline.

file 🔒

Expands to the file name in which it was invoked.

format 🔒

Creates a String using interpolation of runtime expressions.

format_args 🔒

Constructs parameters for the other string-formatting macros.

include 🔒

Parses a file as an expression or an item according to the context.

include_bytes 🔒

Includes a file as a reference to a byte array.

include_str 🔒

Includes a UTF-8 encoded file as a string.

is_x86_feature_detected 🔒

A macro to test at runtime whether a CPU feature is available on x86/x86-64 platforms.

line 🔒

Expands to the line number on which it was invoked.

matches 🔒

Returns whether the given expression matches the provided pattern.

module_path 🔒

Expands to a string that represents the current module path.

option_env 🔒

Optionally inspects an environment variable at compile time.

panic 🔒

Panics the current thread.

print 🔒

Prints to the standard output.

println 🔒

Prints to the standard output, with a newline.

stringify 🔒

Stringifies its arguments.

thread_local 🔒

Declare a new thread local storage key of type std::thread::LocalKey.

todo 🔒

Indicates unfinished code.

try 🔒 Deprecated

Unwraps a result or propagates its error.

unimplemented 🔒

Indicates unimplemented code by panicking with a message of “not implemented”.

unreachable 🔒

Indicates unreachable code.

vec 🔒

Creates a Vec containing the arguments.

write 🔒

Writes formatted data into a buffer.

writeln 🔒

Writes formatted data into a buffer, with a newline appended.

cfg_select 🔒 Experimental

A macro for defining #[cfg] match-like statements.

concat_bytes 🔒 Experimental

Concatenates literals into a byte slice.

concat_idents 🔒 DeprecatedExperimental

Concatenates identifiers into one identifier.

const_format_args 🔒 Experimental

Same as format_args, but can be used in some const contexts.

format_args_nl 🔒 Experimental

Same as format_args, but adds a newline in the end.

log_syntax 🔒 Experimental

Prints passed tokens into the standard output.

trace_macros 🔒 Experimental

Enables or disables tracing functionality used for debugging other macros.