| #![cfg_attr(docsrs, feature(doc_cfg, doc_auto_cfg))] |
|
|
| pub use quickcheck::*; |
|
|
| use core::ops::Range; |
| use num_traits::sign::Unsigned; |
|
|
| pub trait GenRange { |
| fn gen_range<T: Unsigned + Arbitrary + Copy>(&mut self, _range: Range<T>) -> T; |
|
|
| fn gen_index(&mut self, ubound: usize) -> usize { |
| if ubound <= (u32::MAX as usize) { |
| self.gen_range(0..ubound as u32) as usize |
| } else { |
| self.gen_range(0..ubound) |
| } |
| } |
| } |
|
|
| impl GenRange for Gen { |
| fn gen_range<T: Unsigned + Arbitrary + Copy>(&mut self, range: Range<T>) -> T { |
| <T as Arbitrary>::arbitrary(self) % (range.end - range.start) + range.start |
| } |
| } |
|
|
| pub trait SliceRandom { |
| fn shuffle<T>(&mut self, arr: &mut [T]); |
| fn choose_multiple<'a, T>( |
| &mut self, |
| arr: &'a [T], |
| amount: usize, |
| ) -> std::iter::Take<std::vec::IntoIter<&'a T>> { |
| let mut v: Vec<&T> = arr.iter().collect(); |
| self.shuffle(&mut v); |
| v.into_iter().take(amount) |
| } |
| } |
|
|
| impl SliceRandom for Gen { |
| fn shuffle<T>(&mut self, arr: &mut [T]) { |
| for i in (1..arr.len()).rev() { |
| |
| arr.swap(i, self.gen_index(i + 1)); |
| } |
| } |
| } |
|
|
