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mod barrel;
mod fn_rand;
pub mod impls;
mod linear;
mod tree;
mod utils;
pub use fn_rand::*;
use impls::*;
use num_traits::{one, zero, AsPrimitive, PrimInt, Zero};
use std::{fmt::Debug, ops::Range};
use utils::*;
#[inline(always)]
fn check<T: PrimInt + AsPrimitive<usize>>(range: Range<T>, n: T) -> (usize, T, T) {
let (min, max) = (range.start.min(range.end), range.start.max(range.end));
let size = abs(max - min);
if size.is_zero() {
panic!("Range cannot be 0")
}
if is_negative(n) {
panic!("n must be >= 0")
}
if size < n {
panic!("The required count is greater than the allowed range")
}
(n.as_(), min, max)
}
#[inline(always)]
pub fn randge<T: PrimInt + AsPrimitive<usize>>(range: Range<T>, n: T, rand: impl FnRand<T>) -> RandgeIter<T, impl FnRand<T>, RangesTree<T>> {
randge_tree(range, n, rand)
}
#[inline]
pub fn randge_linear<T: PrimInt + AsPrimitive<usize>>(range: Range<T>, n: T, rand: impl FnRand<T>) -> RandgeIter<T, impl FnRand<T>, RangesLinear<T>> {
let (len, min, max) = check(range, n);
let take = RangesLinear::new(min, max);
RandgeIter::new(len, take, rand)
}
#[inline]
pub fn randge_tree<T: PrimInt + AsPrimitive<usize>>(range: Range<T>, n: T, rand: impl FnRand<T>) -> RandgeIter<T, impl FnRand<T>, RangesTree<T>> {
let (len, min, max) = check(range, n);
let take = RangesTree::new(min, max);
RandgeIter::new(len, take, rand)
}
#[inline]
pub fn randge_barrel<T: PrimInt + AsPrimitive<usize>>(range: Range<T>, n: T, rand: impl FnRand<T>) -> RandgeIter<T, impl FnRand<T>, RangesBarrel<T>>
where
T: AsPrimitive<usize>,
Range<T>: Iterator<Item = T>,
{
let (len, min, max) = check(range, n);
let take = RangesBarrel::new(min, max);
RandgeIter::new(len, take, rand)
}
#[cfg(test)]
mod tests;
#[cfg(test)]
mod test {
use super::*;
use rand::thread_rng;
#[test]
fn test_linear() {
let v = randge_linear(5..15, 5, thread_rng());
let v: Vec<_> = v.collect();
println!("{:?}", v);
}
#[test]
fn test_tree() {
let v = randge_tree(5..15, 5, thread_rng());
let v: Vec<_> = v.collect();
println!("{:?}", v);
}
#[test]
fn test_barrel() {
let v = randge_barrel(5..15, 5, thread_rng());
let v: Vec<_> = v.collect();
println!("{:?}", v);
}
}