fastrand-1.8.0/.cargo_vcs_info.json0000644000000001360000000000100126440ustar { "git": { "sha1": "f53d813aa32ee13ff23bfef61bba3e688d2aeaa3" }, "path_in_vcs": "" }fastrand-1.8.0/CHANGELOG.md000064400000000000000000000021661046102023000132520ustar 00000000000000# 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-1.8.0/Cargo.toml0000644000000025760000000000100106540ustar # 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 = "1.8.0" 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(target_arch = \"wasm32\")".dependencies.instant] version = "0.1" [target."cfg(target_arch = \"wasm32\")".dev-dependencies.getrandom] version = "0.2" features = ["js"] [target."cfg(target_arch = \"wasm32\")".dev-dependencies.instant] version = "0.1" features = ["wasm-bindgen"] [target."cfg(target_arch = \"wasm32\")".dev-dependencies.wasm-bindgen-test] version = "0.3" fastrand-1.8.0/Cargo.toml.orig000064400000000000000000000014301046102023000143210ustar 00000000000000[package] name = "fastrand" # When publishing a new version: # - Update CHANGELOG.md # - Create "v1.x.y" git tag version = "1.8.0" 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(target_arch = "wasm32")'.dependencies] instant = "0.1" [target.'cfg(target_arch = "wasm32")'.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-1.8.0/LICENSE-APACHE000064400000000000000000000251371046102023000133700ustar 00000000000000 Apache License Version 2.0, January 2004 http://www.apache.org/licenses/ TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 1. 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See the License for the specific language governing permissions and limitations under the License. fastrand-1.8.0/LICENSE-MIT000064400000000000000000000017771046102023000131040ustar 00000000000000Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. fastrand-1.8.0/README.md000064400000000000000000000042761046102023000127240ustar 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-1.8.0/benches/bench.rs000064400000000000000000000027371046102023000145010ustar 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 }) } fastrand-1.8.0/src/lib.rs000064400000000000000000000430301046102023000133370ustar 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::hash::{Hash, Hasher}; use std::ops::{Bound, RangeBounds}; use std::thread; #[cfg(target_arch = "wasm32")] use instant::Instant; #[cfg(not(target_arch = "wasm32"))] 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] 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)); } } 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, TryInto}; 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-1.8.0/tests/char.rs000064400000000000000000000026651046102023000140720ustar 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-1.8.0/tests/smoke.rs000064400000000000000000000046771046102023000143000ustar 00000000000000#[cfg(target_arch = "wasm32")] use wasm_bindgen_test::*; #[cfg(target_arch = "wasm32")] wasm_bindgen_test::wasm_bindgen_test_configure!(run_in_browser); #[test] #[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)] fn bool() { for x in &[false, true] { while fastrand::bool() != *x {} } } #[test] #[cfg_attr(target_arch = "wasm32", wasm_bindgen_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] #[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)] fn i8() { for x in -128..-120 { while fastrand::i8(..-120) != x {} } for x in 120..=127 { while fastrand::i8(120..) != x {} } } #[test] #[cfg_attr(target_arch = "wasm32", wasm_bindgen_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] #[cfg_attr(target_arch = "wasm32", wasm_bindgen_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] #[cfg_attr(target_arch = "wasm32", wasm_bindgen_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] #[cfg_attr(target_arch = "wasm32", wasm_bindgen_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] #[cfg_attr(target_arch = "wasm32", wasm_bindgen_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] #[cfg_attr(target_arch = "wasm32", wasm_bindgen_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(..)); }