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pub use autorand_derive::Random; pub use rand; use std::collections::{HashMap, BTreeMap, HashSet, BTreeSet, VecDeque, LinkedList}; use std::hash::{Hash, BuildHasher}; use rand::{Rng, distributions::Alphanumeric}; pub trait Random: Sized { fn random() -> Self; } impl<T: Random> Random for Option<T> { fn random() -> Self { if rand::random::<bool>() { Some(T::random()) } else { None } } } impl Random for String { fn random() -> Self { let length = rand::random::<u8>() as usize; (0..) .map(|_| rand::thread_rng().sample(Alphanumeric)) .take(length) .collect() } } impl<T: Random> Random for Vec<T> { fn random() -> Self { rand_length_iter().collect() } } impl<K: Random + Eq + Hash, V: Random, S: BuildHasher + Default> Random for HashMap<K, V, S> { fn random() -> Self { rand_length_iter::<(K, V)>().collect() } } impl<K: Random + Ord, V: Random> Random for BTreeMap<K, V> { fn random() -> Self { rand_length_iter::<(K, V)>().collect() } } impl<T: Random + Eq + Hash, S: BuildHasher + Default> Random for HashSet<T, S> { fn random() -> Self { rand_length_iter().collect() } } impl<T: Random + Ord> Random for BTreeSet<T> { fn random() -> Self { rand_length_iter().collect() } } impl<T: Random> Random for VecDeque<T> { fn random() -> Self { rand_length_iter().collect() } } impl<T: Random> Random for LinkedList<T> { fn random() -> Self { rand_length_iter().collect() } } fn rand_length_iter<T: Random>() -> impl Iterator<Item=T> { let length = rand::random::<u8>() as usize; rand_iter().take(length) } fn rand_iter<T: Random>() -> impl Iterator<Item=T> { (0..).map(|_| T::random()) } macro_rules! impl_primitives { ($($t:ty,)*) => { $( impl Random for $t { fn random() -> Self { rand::random() } } )* }; } impl_primitives!( u8, u16, u32, u64, i8, i16, i32, i64, f32, f64, usize, isize, char, bool, ); macro_rules! impl_arrays { ($($s:expr,)*) => { $( impl<T: Random> Random for [T; $s] { fn random() -> Self { unsafe { let mut array: [T; $s] = std::mem::uninitialized(); for i in 0..$s { std::ptr::write(&mut array[i], T::random()); } array } } } )* }; } impl_arrays!(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 31, 32, 64, 128, 256, 512, 1024, 2048, 4096, 8192, 16384,); macro_rules! impl_tuples { ($([$($t:tt)*],)*) => { $( impl<$($t:Random,)*> Random for ($($t,)*) { fn random() -> Self { ($($t::random(),)*) } } )* }; } impl_tuples!( [A], [A B], [A B C], [A B C D], [A B C D E], [A B C D E F], [A B C D E F G], [A B C D E F G H], [A B C D E F G H I], [A B C D E F G H I J], [A B C D E F G H I J K], );