fastrand-1.9.0/.cargo_vcs_info.json0000644000000001360000000000100126450ustar {
"git": {
"sha1": "675fa424bc065bb9bd0036785838a810ef0c189b"
},
"path_in_vcs": ""
}fastrand-1.9.0/CHANGELOG.md000064400000000000000000000023271046102023000132520ustar 00000000000000# Version 1.9.0
- Add `Rng::fill()` (#35, #43)
- Add `#[must_use]` to `Rng::with_seed()` (#46)
# Version 1.8.0
- Add `get_seed()` and `Rng::get_seed()` (#33)
# Version 1.7.0
- Add `char()` and `Rng::char()` (#25)
# Version 1.6.0
- Implement `PartialEq` and `Eq` for `Rng` (#23)
# Version 1.5.0
- Switch to Wyrand (#14)
# Version 1.4.1
- Fix bug when generating a signed integer within a range (#16)
# Version 1.4.0
- Add wasm support.
# Version 1.3.5
- Reword docs.
- Add `Rng::with_seed()`.
# Version 1.3.4
- Implement `Clone` for `Rng`.
# Version 1.3.3
- Forbid unsafe code.
# Version 1.3.2
- Support older Rust versions.
# Version 1.3.1
- Tweak Cargo keywords.
# Version 1.3.0
- Add `f32()` and `f64()`.
- Add `lowercase()`, `uppercase()`, `alphabetic()`, and `digit()`.
# Version 1.2.4
- Switch to PCG XSH RR 64/32.
- Fix a bug in `gen_mod_u128`.
- Fix bias in ranges.
# Version 1.2.3
- Support Rust 1.32.0
# Version 1.2.2
- Use `std::$t::MAX` rather than `$t::MAX` to support older Rust versions.
# Version 1.2.1
- Inline all functions.
# Version 1.2.0
- Add `Rng` struct.
# Version 1.1.0
- Switch to PCG implementation.
- Add `alphanumeric()`.
- Add `seed()`.
# Version 1.0.0
- Initial version
fastrand-1.9.0/Cargo.toml0000644000000027760000000000100106570ustar # THIS FILE IS AUTOMATICALLY GENERATED BY CARGO
#
# When uploading crates to the registry Cargo will automatically
# "normalize" Cargo.toml files for maximal compatibility
# with all versions of Cargo and also rewrite `path` dependencies
# to registry (e.g., crates.io) dependencies.
#
# If you are reading this file be aware that the original Cargo.toml
# will likely look very different (and much more reasonable).
# See Cargo.toml.orig for the original contents.
[package]
edition = "2018"
rust-version = "1.34"
name = "fastrand"
version = "1.9.0"
authors = ["Stjepan Glavina "]
exclude = ["/.*"]
description = "A simple and fast random number generator"
readme = "README.md"
keywords = [
"simple",
"fast",
"rand",
"random",
"wyrand",
]
categories = ["algorithms"]
license = "Apache-2.0 OR MIT"
repository = "https://github.com/smol-rs/fastrand"
[dev-dependencies.getrandom]
version = "0.2"
[dev-dependencies.rand]
version = "0.8"
[dev-dependencies.wyhash]
version = "0.5"
[target."cfg(all(target_arch = \"wasm32\", not(target_os = \"wasi\")))".dependencies.instant]
version = "0.1"
[target."cfg(all(target_arch = \"wasm32\", not(target_os = \"wasi\")))".dev-dependencies.getrandom]
version = "0.2"
features = ["js"]
[target."cfg(all(target_arch = \"wasm32\", not(target_os = \"wasi\")))".dev-dependencies.instant]
version = "0.1"
features = ["wasm-bindgen"]
[target."cfg(all(target_arch = \"wasm32\", not(target_os = \"wasi\")))".dev-dependencies.wasm-bindgen-test]
version = "0.3"
fastrand-1.9.0/Cargo.toml.orig000064400000000000000000000015241046102023000143260ustar 00000000000000[package]
name = "fastrand"
# When publishing a new version:
# - Update CHANGELOG.md
# - Create "v1.x.y" git tag
version = "1.9.0"
authors = ["Stjepan Glavina "]
edition = "2018"
rust-version = "1.34"
description = "A simple and fast random number generator"
license = "Apache-2.0 OR MIT"
repository = "https://github.com/smol-rs/fastrand"
keywords = ["simple", "fast", "rand", "random", "wyrand"]
categories = ["algorithms"]
exclude = ["/.*"]
[target.'cfg(all(target_arch = "wasm32", not(target_os = "wasi")))'.dependencies]
instant = "0.1"
[target.'cfg(all(target_arch = "wasm32", not(target_os = "wasi")))'.dev-dependencies]
instant = { version = "0.1", features = ["wasm-bindgen"] }
wasm-bindgen-test = "0.3"
getrandom = { version = "0.2", features = ["js"] }
[dev-dependencies]
rand = "0.8"
wyhash = "0.5"
getrandom = "0.2"
fastrand-1.9.0/LICENSE-APACHE000064400000000000000000000251371046102023000133710ustar 00000000000000 Apache License
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fastrand-1.9.0/README.md000064400000000000000000000042761046102023000127250ustar 00000000000000# fastrand
[![Build](https://github.com/smol-rs/fastrand/workflows/Build%20and%20test/badge.svg)](
https://github.com/smol-rs/fastrand/actions)
[![License](https://img.shields.io/badge/license-Apache--2.0_OR_MIT-blue.svg)](
https://github.com/smol-rs/fastrand)
[![Cargo](https://img.shields.io/crates/v/fastrand.svg)](
https://crates.io/crates/fastrand)
[![Documentation](https://docs.rs/fastrand/badge.svg)](
https://docs.rs/fastrand)
A simple and fast random number generator.
The implementation uses [Wyrand](https://github.com/wangyi-fudan/wyhash), a simple and fast
generator but **not** cryptographically secure.
## Examples
Flip a coin:
```rust
if fastrand::bool() {
println!("heads");
} else {
println!("tails");
}
```
Generate a random `i32`:
```rust
let num = fastrand::i32(..);
```
Choose a random element in an array:
```rust
let v = vec![1, 2, 3, 4, 5];
let i = fastrand::usize(..v.len());
let elem = v[i];
```
Shuffle an array:
```rust
let mut v = vec![1, 2, 3, 4, 5];
fastrand::shuffle(&mut v);
```
Generate a random `Vec` or `String`:
```rust
use std::iter::repeat_with;
let v: Vec = repeat_with(|| fastrand::i32(..)).take(10).collect();
let s: String = repeat_with(fastrand::alphanumeric).take(10).collect();
```
To get reproducible results on every run, initialize the generator with a seed:
```rust
// Pick an arbitrary number as seed.
fastrand::seed(7);
// Now this prints the same number on every run:
println!("{}", fastrand::u32(..));
```
To be more efficient, create a new `Rng` instance instead of using the thread-local
generator:
```rust
use std::iter::repeat_with;
let rng = fastrand::Rng::new();
let mut bytes: Vec = repeat_with(|| rng.u8(..)).take(10_000).collect();
```
## License
Licensed under either of
* Apache License, Version 2.0 ([LICENSE-APACHE](LICENSE-APACHE) or http://www.apache.org/licenses/LICENSE-2.0)
* MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)
at your option.
#### Contribution
Unless you explicitly state otherwise, any contribution intentionally submitted
for inclusion in the work by you, as defined in the Apache-2.0 license, shall be
dual licensed as above, without any additional terms or conditions.
fastrand-1.9.0/benches/bench.rs000064400000000000000000000036471046102023000145030ustar 00000000000000#![feature(test)]
extern crate test;
use rand::prelude::*;
use test::Bencher;
use wyhash::WyRng;
#[bench]
fn shuffle_wyhash(b: &mut Bencher) {
let mut rng = WyRng::from_rng(thread_rng()).unwrap();
let mut x = (0..100).collect::>();
b.iter(|| {
x.shuffle(&mut rng);
x[0]
})
}
#[bench]
fn shuffle_fastrand(b: &mut Bencher) {
let rng = fastrand::Rng::new();
let mut x = (0..100).collect::>();
b.iter(|| {
rng.shuffle(&mut x);
x[0]
})
}
#[bench]
fn u8_wyhash(b: &mut Bencher) {
let mut rng = WyRng::from_rng(thread_rng()).unwrap();
b.iter(|| {
let mut sum = 0u8;
for _ in 0..10_000 {
sum = sum.wrapping_add(rng.gen::());
}
sum
})
}
#[bench]
fn u8_fastrand(b: &mut Bencher) {
let rng = fastrand::Rng::new();
b.iter(|| {
let mut sum = 0u8;
for _ in 0..10_000 {
sum = sum.wrapping_add(rng.u8(..));
}
sum
})
}
#[bench]
fn u32_wyhash(b: &mut Bencher) {
let mut rng = WyRng::from_rng(thread_rng()).unwrap();
b.iter(|| {
let mut sum = 0u32;
for _ in 0..10_000 {
sum = sum.wrapping_add(rng.gen::());
}
sum
})
}
#[bench]
fn u32_fastrand(b: &mut Bencher) {
let rng = fastrand::Rng::new();
b.iter(|| {
let mut sum = 0u32;
for _ in 0..10_000 {
sum = sum.wrapping_add(rng.u32(..));
}
sum
})
}
#[bench]
fn fill(b: &mut Bencher) {
let rng = fastrand::Rng::new();
b.iter(|| {
// Pick a size that isn't divisble by 8.
let mut bytes = [0u8; 367];
rng.fill(&mut bytes);
bytes
})
}
#[bench]
fn fill_naive(b: &mut Bencher) {
let rng = fastrand::Rng::new();
b.iter(|| {
let mut bytes = [0u8; 367];
for item in &mut bytes {
*item = rng.u8(..);
}
bytes
})
}
fastrand-1.9.0/src/lib.rs000064400000000000000000000451511046102023000133460ustar 00000000000000//! A simple and fast random number generator.
//!
//! The implementation uses [Wyrand](https://github.com/wangyi-fudan/wyhash), a simple and fast
//! generator but **not** cryptographically secure.
//!
//! # Examples
//!
//! Flip a coin:
//!
//! ```
//! if fastrand::bool() {
//! println!("heads");
//! } else {
//! println!("tails");
//! }
//! ```
//!
//! Generate a random `i32`:
//!
//! ```
//! let num = fastrand::i32(..);
//! ```
//!
//! Choose a random element in an array:
//!
//! ```
//! let v = vec![1, 2, 3, 4, 5];
//! let i = fastrand::usize(..v.len());
//! let elem = v[i];
//! ```
//!
//! Shuffle an array:
//!
//! ```
//! let mut v = vec![1, 2, 3, 4, 5];
//! fastrand::shuffle(&mut v);
//! ```
//!
//! Generate a random [`Vec`] or [`String`]:
//!
//! ```
//! use std::iter::repeat_with;
//!
//! let v: Vec = repeat_with(|| fastrand::i32(..)).take(10).collect();
//! let s: String = repeat_with(fastrand::alphanumeric).take(10).collect();
//! ```
//!
//! To get reproducible results on every run, initialize the generator with a seed:
//!
//! ```
//! // Pick an arbitrary number as seed.
//! fastrand::seed(7);
//!
//! // Now this prints the same number on every run:
//! println!("{}", fastrand::u32(..));
//! ```
//!
//! To be more efficient, create a new [`Rng`] instance instead of using the thread-local
//! generator:
//!
//! ```
//! use std::iter::repeat_with;
//!
//! let rng = fastrand::Rng::new();
//! let mut bytes: Vec = repeat_with(|| rng.u8(..)).take(10_000).collect();
//! ```
#![forbid(unsafe_code)]
#![warn(missing_docs, missing_debug_implementations, rust_2018_idioms)]
use std::cell::Cell;
use std::collections::hash_map::DefaultHasher;
use std::convert::TryInto;
use std::hash::{Hash, Hasher};
use std::ops::{Bound, RangeBounds};
use std::thread;
#[cfg(all(target_arch = "wasm32", not(target_os = "wasi")))]
use instant::Instant;
#[cfg(not(all(target_arch = "wasm32", not(target_os = "wasi"))))]
use std::time::Instant;
/// A random number generator.
#[derive(Debug, PartialEq, Eq)]
pub struct Rng(Cell);
impl Default for Rng {
#[inline]
fn default() -> Rng {
Rng::new()
}
}
impl Clone for Rng {
/// Clones the generator by deterministically deriving a new generator based on the initial
/// seed.
///
/// # Example
///
/// ```
/// // Seed two generators equally, and clone both of them.
/// let base1 = fastrand::Rng::new();
/// base1.seed(0x4d595df4d0f33173);
/// base1.bool(); // Use the generator once.
///
/// let base2 = fastrand::Rng::new();
/// base2.seed(0x4d595df4d0f33173);
/// base2.bool(); // Use the generator once.
///
/// let rng1 = base1.clone();
/// let rng2 = base2.clone();
///
/// assert_eq!(rng1.u64(..), rng2.u64(..), "the cloned generators are identical");
/// ```
fn clone(&self) -> Rng {
Rng::with_seed(self.gen_u64())
}
}
impl Rng {
/// Generates a random `u32`.
#[inline]
fn gen_u32(&self) -> u32 {
self.gen_u64() as u32
}
/// Generates a random `u64`.
#[inline]
fn gen_u64(&self) -> u64 {
let s = self.0.get().wrapping_add(0xA0761D6478BD642F);
self.0.set(s);
let t = u128::from(s) * u128::from(s ^ 0xE7037ED1A0B428DB);
(t as u64) ^ (t >> 64) as u64
}
/// Generates a random `u128`.
#[inline]
fn gen_u128(&self) -> u128 {
(u128::from(self.gen_u64()) << 64) | u128::from(self.gen_u64())
}
/// Generates a random `u32` in `0..n`.
#[inline]
fn gen_mod_u32(&self, n: u32) -> u32 {
// Adapted from: https://lemire.me/blog/2016/06/30/fast-random-shuffling/
let mut r = self.gen_u32();
let mut hi = mul_high_u32(r, n);
let mut lo = r.wrapping_mul(n);
if lo < n {
let t = n.wrapping_neg() % n;
while lo < t {
r = self.gen_u32();
hi = mul_high_u32(r, n);
lo = r.wrapping_mul(n);
}
}
hi
}
/// Generates a random `u64` in `0..n`.
#[inline]
fn gen_mod_u64(&self, n: u64) -> u64 {
// Adapted from: https://lemire.me/blog/2016/06/30/fast-random-shuffling/
let mut r = self.gen_u64();
let mut hi = mul_high_u64(r, n);
let mut lo = r.wrapping_mul(n);
if lo < n {
let t = n.wrapping_neg() % n;
while lo < t {
r = self.gen_u64();
hi = mul_high_u64(r, n);
lo = r.wrapping_mul(n);
}
}
hi
}
/// Generates a random `u128` in `0..n`.
#[inline]
fn gen_mod_u128(&self, n: u128) -> u128 {
// Adapted from: https://lemire.me/blog/2016/06/30/fast-random-shuffling/
let mut r = self.gen_u128();
let mut hi = mul_high_u128(r, n);
let mut lo = r.wrapping_mul(n);
if lo < n {
let t = n.wrapping_neg() % n;
while lo < t {
r = self.gen_u128();
hi = mul_high_u128(r, n);
lo = r.wrapping_mul(n);
}
}
hi
}
}
thread_local! {
static RNG: Rng = Rng(Cell::new({
let mut hasher = DefaultHasher::new();
Instant::now().hash(&mut hasher);
thread::current().id().hash(&mut hasher);
let hash = hasher.finish();
(hash << 1) | 1
}));
}
/// Computes `(a * b) >> 32`.
#[inline]
fn mul_high_u32(a: u32, b: u32) -> u32 {
(((a as u64) * (b as u64)) >> 32) as u32
}
/// Computes `(a * b) >> 64`.
#[inline]
fn mul_high_u64(a: u64, b: u64) -> u64 {
(((a as u128) * (b as u128)) >> 64) as u64
}
/// Computes `(a * b) >> 128`.
#[inline]
fn mul_high_u128(a: u128, b: u128) -> u128 {
// Adapted from: https://stackoverflow.com/a/28904636
let a_lo = a as u64 as u128;
let a_hi = (a >> 64) as u64 as u128;
let b_lo = b as u64 as u128;
let b_hi = (b >> 64) as u64 as u128;
let carry = (a_lo * b_lo) >> 64;
let carry = ((a_hi * b_lo) as u64 as u128 + (a_lo * b_hi) as u64 as u128 + carry) >> 64;
a_hi * b_hi + ((a_hi * b_lo) >> 64) + ((a_lo * b_hi) >> 64) + carry
}
macro_rules! rng_integer {
($t:tt, $unsigned_t:tt, $gen:tt, $mod:tt, $doc:tt) => {
#[doc = $doc]
///
/// Panics if the range is empty.
#[inline]
pub fn $t(&self, range: impl RangeBounds<$t>) -> $t {
let panic_empty_range = || {
panic!(
"empty range: {:?}..{:?}",
range.start_bound(),
range.end_bound()
)
};
let low = match range.start_bound() {
Bound::Unbounded => std::$t::MIN,
Bound::Included(&x) => x,
Bound::Excluded(&x) => x.checked_add(1).unwrap_or_else(panic_empty_range),
};
let high = match range.end_bound() {
Bound::Unbounded => std::$t::MAX,
Bound::Included(&x) => x,
Bound::Excluded(&x) => x.checked_sub(1).unwrap_or_else(panic_empty_range),
};
if low > high {
panic_empty_range();
}
if low == std::$t::MIN && high == std::$t::MAX {
self.$gen() as $t
} else {
let len = high.wrapping_sub(low).wrapping_add(1);
low.wrapping_add(self.$mod(len as $unsigned_t as _) as $t)
}
}
};
}
impl Rng {
/// Creates a new random number generator.
#[inline]
pub fn new() -> Rng {
Rng::with_seed(
RNG.try_with(|rng| rng.u64(..))
.unwrap_or(0x4d595df4d0f33173),
)
}
/// Creates a new random number generator with the initial seed.
#[inline]
#[must_use = "this creates a new instance of `Rng`; if you want to initialize the thread-local generator, use `fastrand::seed()` instead"]
pub fn with_seed(seed: u64) -> Self {
let rng = Rng(Cell::new(0));
rng.seed(seed);
rng
}
/// Generates a random `char` in ranges a-z and A-Z.
#[inline]
pub fn alphabetic(&self) -> char {
const CHARS: &[u8] = b"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
let len = CHARS.len() as u8;
let i = self.u8(..len);
CHARS[i as usize] as char
}
/// Generates a random `char` in ranges a-z, A-Z and 0-9.
#[inline]
pub fn alphanumeric(&self) -> char {
const CHARS: &[u8] = b"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
let len = CHARS.len() as u8;
let i = self.u8(..len);
CHARS[i as usize] as char
}
/// Generates a random `bool`.
#[inline]
pub fn bool(&self) -> bool {
self.u8(..) % 2 == 0
}
/// Generates a random digit in the given `base`.
///
/// Digits are represented by `char`s in ranges 0-9 and a-z.
///
/// Panics if the base is zero or greater than 36.
#[inline]
pub fn digit(&self, base: u32) -> char {
if base == 0 {
panic!("base cannot be zero");
}
if base > 36 {
panic!("base cannot be larger than 36");
}
let num = self.u8(..base as u8);
if num < 10 {
(b'0' + num) as char
} else {
(b'a' + num - 10) as char
}
}
/// Generates a random `f32` in range `0..1`.
pub fn f32(&self) -> f32 {
let b = 32;
let f = std::f32::MANTISSA_DIGITS - 1;
f32::from_bits((1 << (b - 2)) - (1 << f) + (self.u32(..) >> (b - f))) - 1.0
}
/// Generates a random `f64` in range `0..1`.
pub fn f64(&self) -> f64 {
let b = 64;
let f = std::f64::MANTISSA_DIGITS - 1;
f64::from_bits((1 << (b - 2)) - (1 << f) + (self.u64(..) >> (b - f))) - 1.0
}
rng_integer!(
i8,
u8,
gen_u32,
gen_mod_u32,
"Generates a random `i8` in the given range."
);
rng_integer!(
i16,
u16,
gen_u32,
gen_mod_u32,
"Generates a random `i16` in the given range."
);
rng_integer!(
i32,
u32,
gen_u32,
gen_mod_u32,
"Generates a random `i32` in the given range."
);
rng_integer!(
i64,
u64,
gen_u64,
gen_mod_u64,
"Generates a random `i64` in the given range."
);
rng_integer!(
i128,
u128,
gen_u128,
gen_mod_u128,
"Generates a random `i128` in the given range."
);
#[cfg(target_pointer_width = "16")]
rng_integer!(
isize,
usize,
gen_u32,
gen_mod_u32,
"Generates a random `isize` in the given range."
);
#[cfg(target_pointer_width = "32")]
rng_integer!(
isize,
usize,
gen_u32,
gen_mod_u32,
"Generates a random `isize` in the given range."
);
#[cfg(target_pointer_width = "64")]
rng_integer!(
isize,
usize,
gen_u64,
gen_mod_u64,
"Generates a random `isize` in the given range."
);
/// Generates a random `char` in range a-z.
#[inline]
pub fn lowercase(&self) -> char {
const CHARS: &[u8] = b"abcdefghijklmnopqrstuvwxyz";
let len = CHARS.len() as u8;
let i = self.u8(..len);
CHARS[i as usize] as char
}
/// Initializes this generator with the given seed.
#[inline]
pub fn seed(&self, seed: u64) {
self.0.set(seed);
}
/// Gives back **current** seed that is being held by this generator.
#[inline]
pub fn get_seed(&self) -> u64 {
self.0.get()
}
/// Shuffles a slice randomly.
#[inline]
pub fn shuffle(&self, slice: &mut [T]) {
for i in 1..slice.len() {
slice.swap(i, self.usize(..=i));
}
}
/// Fill a byte slice with random data.
#[inline]
pub fn fill(&self, slice: &mut [u8]) {
// We fill the slice by chunks of 8 bytes, or one block of
// WyRand output per new state.
let mut chunks = slice.chunks_exact_mut(core::mem::size_of::());
for chunk in chunks.by_ref() {
let n = self.gen_u64().to_ne_bytes();
// Safe because the chunks are always 8 bytes exactly.
chunk.copy_from_slice(&n);
}
let remainder = chunks.into_remainder();
// Any remainder will always be less than 8 bytes.
if !remainder.is_empty() {
// Generate one last block of 8 bytes of entropy
let n = self.gen_u64().to_ne_bytes();
// Use the remaining length to copy from block
remainder.copy_from_slice(&n[..remainder.len()]);
}
}
rng_integer!(
u8,
u8,
gen_u32,
gen_mod_u32,
"Generates a random `u8` in the given range."
);
rng_integer!(
u16,
u16,
gen_u32,
gen_mod_u32,
"Generates a random `u16` in the given range."
);
rng_integer!(
u32,
u32,
gen_u32,
gen_mod_u32,
"Generates a random `u32` in the given range."
);
rng_integer!(
u64,
u64,
gen_u64,
gen_mod_u64,
"Generates a random `u64` in the given range."
);
rng_integer!(
u128,
u128,
gen_u128,
gen_mod_u128,
"Generates a random `u128` in the given range."
);
#[cfg(target_pointer_width = "16")]
rng_integer!(
usize,
usize,
gen_u32,
gen_mod_u32,
"Generates a random `usize` in the given range."
);
#[cfg(target_pointer_width = "32")]
rng_integer!(
usize,
usize,
gen_u32,
gen_mod_u32,
"Generates a random `usize` in the given range."
);
#[cfg(target_pointer_width = "64")]
rng_integer!(
usize,
usize,
gen_u64,
gen_mod_u64,
"Generates a random `usize` in the given range."
);
#[cfg(target_pointer_width = "128")]
rng_integer!(
usize,
usize,
gen_u128,
gen_mod_u128,
"Generates a random `usize` in the given range."
);
/// Generates a random `char` in range A-Z.
#[inline]
pub fn uppercase(&self) -> char {
const CHARS: &[u8] = b"ABCDEFGHIJKLMNOPQRSTUVWXYZ";
let len = CHARS.len() as u8;
let i = self.u8(..len);
CHARS[i as usize] as char
}
/// Generates a random `char` in the given range.
///
/// Panics if the range is empty.
#[inline]
pub fn char(&self, range: impl RangeBounds) -> char {
use std::convert::TryFrom;
let panic_empty_range = || {
panic!(
"empty range: {:?}..{:?}",
range.start_bound(),
range.end_bound()
)
};
let surrogate_start = 0xd800u32;
let surrogate_len = 0x800u32;
let low = match range.start_bound() {
Bound::Unbounded => 0u8 as char,
Bound::Included(&x) => x,
Bound::Excluded(&x) => {
let scalar = if x as u32 == surrogate_start - 1 {
surrogate_start + surrogate_len
} else {
x as u32 + 1
};
char::try_from(scalar).unwrap_or_else(|_| panic_empty_range())
}
};
let high = match range.end_bound() {
Bound::Unbounded => std::char::MAX,
Bound::Included(&x) => x,
Bound::Excluded(&x) => {
let scalar = if x as u32 == surrogate_start + surrogate_len {
surrogate_start - 1
} else {
(x as u32).wrapping_sub(1)
};
char::try_from(scalar).unwrap_or_else(|_| panic_empty_range())
}
};
if low > high {
panic_empty_range();
}
let gap = if (low as u32) < surrogate_start && (high as u32) >= surrogate_start {
surrogate_len
} else {
0
};
let range = high as u32 - low as u32 - gap;
let mut val = self.u32(0..=range) + low as u32;
if val >= surrogate_start {
val += gap;
}
val.try_into().unwrap()
}
}
/// Initializes the thread-local generator with the given seed.
#[inline]
pub fn seed(seed: u64) {
RNG.with(|rng| rng.seed(seed))
}
/// Gives back **current** seed that is being held by the thread-local generator.
#[inline]
pub fn get_seed() -> u64 {
RNG.with(|rng| rng.get_seed())
}
/// Generates a random `bool`.
#[inline]
pub fn bool() -> bool {
RNG.with(|rng| rng.bool())
}
/// Generates a random `char` in ranges a-z and A-Z.
#[inline]
pub fn alphabetic() -> char {
RNG.with(|rng| rng.alphabetic())
}
/// Generates a random `char` in ranges a-z, A-Z and 0-9.
#[inline]
pub fn alphanumeric() -> char {
RNG.with(|rng| rng.alphanumeric())
}
/// Generates a random `char` in range a-z.
#[inline]
pub fn lowercase() -> char {
RNG.with(|rng| rng.lowercase())
}
/// Generates a random `char` in range A-Z.
#[inline]
pub fn uppercase() -> char {
RNG.with(|rng| rng.uppercase())
}
/// Generates a random digit in the given `base`.
///
/// Digits are represented by `char`s in ranges 0-9 and a-z.
///
/// Panics if the base is zero or greater than 36.
#[inline]
pub fn digit(base: u32) -> char {
RNG.with(|rng| rng.digit(base))
}
/// Shuffles a slice randomly.
#[inline]
pub fn shuffle(slice: &mut [T]) {
RNG.with(|rng| rng.shuffle(slice))
}
macro_rules! integer {
($t:tt, $doc:tt) => {
#[doc = $doc]
///
/// Panics if the range is empty.
#[inline]
pub fn $t(range: impl RangeBounds<$t>) -> $t {
RNG.with(|rng| rng.$t(range))
}
};
}
integer!(u8, "Generates a random `u8` in the given range.");
integer!(i8, "Generates a random `i8` in the given range.");
integer!(u16, "Generates a random `u16` in the given range.");
integer!(i16, "Generates a random `i16` in the given range.");
integer!(u32, "Generates a random `u32` in the given range.");
integer!(i32, "Generates a random `i32` in the given range.");
integer!(u64, "Generates a random `u64` in the given range.");
integer!(i64, "Generates a random `i64` in the given range.");
integer!(u128, "Generates a random `u128` in the given range.");
integer!(i128, "Generates a random `i128` in the given range.");
integer!(usize, "Generates a random `usize` in the given range.");
integer!(isize, "Generates a random `isize` in the given range.");
integer!(char, "Generates a random `char` in the given range.");
/// Generates a random `f32` in range `0..1`.
pub fn f32() -> f32 {
RNG.with(|rng| rng.f32())
}
/// Generates a random `f64` in range `0..1`.
pub fn f64() -> f64 {
RNG.with(|rng| rng.f64())
}
fastrand-1.9.0/tests/char.rs000064400000000000000000000026651046102023000140730ustar 00000000000000use std::convert::TryFrom;
use std::ops::RangeBounds;
fn test_char_coverage(n: usize, range: R)
where
R: Iterator- + RangeBounds + Clone,
{
use std::collections::HashSet;
let all: HashSet = range.clone().collect();
let mut covered = HashSet::new();
for _ in 0..n {
let c = fastrand::char(range.clone());
assert!(all.contains(&c));
covered.insert(c);
}
assert_eq!(covered, all);
}
#[test]
fn test_char() {
// ASCII control chars.
let nul = 0u8 as char;
let soh = 1u8 as char;
let stx = 2u8 as char;
// Some undefined Hangul Jamo codepoints just before
// the surrogate area.
let last_jamo = char::try_from(0xd7ffu32).unwrap();
let penultimate_jamo = char::try_from(last_jamo as u32 - 1).unwrap();
// Private-use codepoints just after the surrogate area.
let first_private = char::try_from(0xe000u32).unwrap();
let second_private = char::try_from(first_private as u32 + 1).unwrap();
// Private-use codepoints at the end of Unicode space.
let last_private = std::char::MAX;
let penultimate_private = char::try_from(last_private as u32 - 1).unwrap();
test_char_coverage(100, nul..stx);
test_char_coverage(100, nul..=soh);
test_char_coverage(400, penultimate_jamo..second_private);
test_char_coverage(400, penultimate_jamo..=second_private);
test_char_coverage(100, penultimate_private..=last_private);
}
fastrand-1.9.0/tests/smoke.rs000064400000000000000000000043231046102023000142650ustar 00000000000000#[cfg(all(target_family = "wasm", not(target_os = "wasi")))]
use wasm_bindgen_test::wasm_bindgen_test as test;
#[cfg(all(target_family = "wasm", not(target_os = "wasi")))]
wasm_bindgen_test::wasm_bindgen_test_configure!(run_in_browser);
#[test]
fn bool() {
for x in &[false, true] {
while fastrand::bool() != *x {}
}
}
#[test]
fn u8() {
for x in 0..10 {
while fastrand::u8(..10) != x {}
}
for x in 200..=u8::MAX {
while fastrand::u8(200..) != x {}
}
}
#[test]
fn i8() {
for x in -128..-120 {
while fastrand::i8(..-120) != x {}
}
for x in 120..=127 {
while fastrand::i8(120..) != x {}
}
}
#[test]
fn u32() {
for n in 1u32..10_000 {
let n = n.wrapping_mul(n);
let n = n.wrapping_mul(n);
if n != 0 {
for _ in 0..1000 {
assert!(fastrand::u32(..n) < n);
}
}
}
}
#[test]
fn u64() {
for n in 1u64..10_000 {
let n = n.wrapping_mul(n);
let n = n.wrapping_mul(n);
let n = n.wrapping_mul(n);
if n != 0 {
for _ in 0..1000 {
assert!(fastrand::u64(..n) < n);
}
}
}
}
#[test]
fn u128() {
for n in 1u128..10_000 {
let n = n.wrapping_mul(n);
let n = n.wrapping_mul(n);
let n = n.wrapping_mul(n);
let n = n.wrapping_mul(n);
if n != 0 {
for _ in 0..1000 {
assert!(fastrand::u128(..n) < n);
}
}
}
}
#[test]
fn fill() {
let r = fastrand::Rng::new();
let mut a = [0u8; 64];
let mut b = [0u8; 64];
r.fill(&mut a);
r.fill(&mut b);
assert_ne!(a, b);
}
#[test]
fn rng() {
let r = fastrand::Rng::new();
assert_ne!(r.u64(..), r.u64(..));
r.seed(7);
let a = r.u64(..);
r.seed(7);
let b = r.u64(..);
assert_eq!(a, b);
}
#[test]
fn rng_init() {
let a = fastrand::Rng::new();
let b = fastrand::Rng::new();
assert_ne!(a.u64(..), b.u64(..));
a.seed(7);
b.seed(7);
assert_eq!(a.u64(..), b.u64(..));
}
#[test]
fn with_seed() {
let a = fastrand::Rng::with_seed(7);
let b = fastrand::Rng::new();
b.seed(7);
assert_eq!(a.u64(..), b.u64(..));
}