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use num::random::{random_unsigned_range, RandomUnsignedRange};
use random::Seed;
use unions::Union2;
/// Defines random union generators.
///
/// Malachite provides [`random_union2s`], but you can also define `random_union3s`,
/// `random_union4s`, and so on, in your program using the code below. The documentation for
/// [`random_union2s`] describes these other functions as well.
///
/// See usage examples [here](self#random_union2s).
///
/// ```
/// # #[macro_use]
/// # extern crate malachite_base;
/// # fn main() {
/// use malachite_base::num::random::{random_unsigned_range, RandomUnsignedRange};
/// use malachite_base::random::Seed;
/// use malachite_base::unions::UnionFromStrError;
/// use std::fmt::{self, Display, Formatter};
/// use std::str::FromStr;
///
/// union_struct!(
/// (pub(crate)),
/// Union3,
/// Union3<T, T, T>,
/// [A, A, 'A', a],
/// [B, B, 'B', b],
/// [C, C, 'C', c]
/// );
/// union_struct!(
/// (pub(crate)),
/// Union4,
/// Union4<T, T, T, T>,
/// [A, A, 'A', a],
/// [B, B, 'B', b],
/// [C, C, 'C', c],
/// [D, D, 'D', d]
/// );
/// union_struct!(
/// (pub(crate)),
/// Union5,
/// Union5<T, T, T, T, T>,
/// [A, A, 'A', a],
/// [B, B, 'B', b],
/// [C, C, 'C', c],
/// [D, D, 'D', d],
/// [E, E, 'E', e]
/// );
/// union_struct!(
/// (pub(crate)),
/// Union6,
/// Union6<T, T, T, T, T, T>,
/// [A, A, 'A', a],
/// [B, B, 'B', b],
/// [C, C, 'C', c],
/// [D, D, 'D', d],
/// [E, E, 'E', e],
/// [F, F, 'F', f]
/// );
/// union_struct!(
/// (pub(crate)),
/// Union7,
/// Union7<T, T, T, T, T, T, T>,
/// [A, A, 'A', a],
/// [B, B, 'B', b],
/// [C, C, 'C', c],
/// [D, D, 'D', d],
/// [E, E, 'E', e],
/// [F, F, 'F', f],
/// [G, G, 'G', g]
/// );
/// union_struct!(
/// (pub(crate)),
/// Union8,
/// Union8<T, T, T, T, T, T, T, T>,
/// [A, A, 'A', a],
/// [B, B, 'B', b],
/// [C, C, 'C', c],
/// [D, D, 'D', d],
/// [E, E, 'E', e],
/// [F, F, 'F', f],
/// [G, G, 'G', g],
/// [H, H, 'H', h]
/// );
///
/// random_unions!(
/// (pub(crate)),
/// Union3,
/// RandomUnion3s,
/// random_union3s,
/// 3,
/// [0, X, I, A, xs, xs_gen],
/// [1, Y, J, B, ys, ys_gen],
/// [2, Z, K, C, zs, zs_gen]
/// );
/// random_unions!(
/// (pub(crate)),
/// Union4,
/// RandomUnion4s,
/// random_union4s,
/// 4,
/// [0, X, I, A, xs, xs_gen],
/// [1, Y, J, B, ys, ys_gen],
/// [2, Z, K, C, zs, zs_gen],
/// [3, W, L, D, ws, ws_gen]
/// );
/// random_unions!(
/// (pub(crate)),
/// Union5,
/// RandomUnion5s,
/// random_union5s,
/// 5,
/// [0, X, I, A, xs, xs_gen],
/// [1, Y, J, B, ys, ys_gen],
/// [2, Z, K, C, zs, zs_gen],
/// [3, W, L, D, ws, ws_gen],
/// [4, V, M, E, vs, vs_gen]
/// );
/// random_unions!(
/// (pub(crate)),
/// Union6,
/// RandomUnion6s,
/// random_union6s,
/// 6,
/// [0, X, I, A, xs, xs_gen],
/// [1, Y, J, B, ys, ys_gen],
/// [2, Z, K, C, zs, zs_gen],
/// [3, W, L, D, ws, ws_gen],
/// [4, V, M, E, vs, vs_gen],
/// [5, U, N, F, us, us_gen]
/// );
/// random_unions!(
/// (pub(crate)),
/// Union7,
/// RandomUnion7s,
/// random_union7s,
/// 7,
/// [0, X, I, A, xs, xs_gen],
/// [1, Y, J, B, ys, ys_gen],
/// [2, Z, K, C, zs, zs_gen],
/// [3, W, L, D, ws, ws_gen],
/// [4, V, M, E, vs, vs_gen],
/// [5, U, N, F, us, us_gen],
/// [6, T, O, G, ts, ts_gen]
/// );
/// random_unions!(
/// (pub(crate)),
/// Union8,
/// RandomUnion8s,
/// random_union8s,
/// 8,
/// [0, X, I, A, xs, xs_gen],
/// [1, Y, J, B, ys, ys_gen],
/// [2, Z, K, C, zs, zs_gen],
/// [3, W, L, D, ws, ws_gen],
/// [4, V, M, E, vs, vs_gen],
/// [5, U, N, F, us, us_gen],
/// [6, T, O, G, ts, ts_gen],
/// [7, S, P, H, ss, ss_gen]
/// );
/// # }
/// ```
#[macro_export]
macro_rules! random_unions {
(
($($vis:tt)*),
$union: ident,
$random_struct: ident,
$random_fn: ident,
$n: expr,
$([$i: expr, $t: ident, $it: ident, $variant: ident, $xs: ident, $xs_gen: ident]),*
) => {
/// This documentation applies not only to `RandomUnion2s`, but also to `RandomUnion3s`,
/// `RandomUnion4s`, and so on. See [`random_unions`] for more information.
///
/// Generates random $n$-unions with elements from $n$ iterators.
#[derive(Clone, Debug)]
$($vis)* struct $random_struct<$($t, $it: Iterator<Item=$t>),*> {
indices: RandomUnsignedRange<usize>,
$($xs: $it,)*
}
impl<$($t, $it: Iterator<Item=$t>),*> Iterator for $random_struct<$($t, $it),*> {
type Item = $union<$($t),*>;
fn next(&mut self) -> Option<Self::Item> {
match self.indices.next().unwrap() {
$($i => self.$xs.next().map($union::$variant),)*
_ => unreachable!(),
}
}
}
/// This documentation applies not only to `random_union2s`, but also to `random_union3s`,
/// `random_union4s`, and so on. See [`random_unions`] for more information.
///
/// Generates random $n$-unions with elements from $n$ iterators.
///
/// The probability of a particular $n$-union being generated is the probability of its
/// element divided by $n$.
///
/// `xs`, `ys`, `zs`, ... must be infinite.
///
/// # Examples
/// See [here](self#random_union2s).
$($vis)* fn $random_fn<$($t, $it: Iterator<Item=$t>),*>(
seed: Seed, $($xs_gen: &dyn Fn(Seed) -> $it),*
) -> $random_struct<$($t, $it),*> {
$random_struct {
indices: random_unsigned_range(seed.fork("indices"), 0, $n),
$($xs: $xs_gen(seed.fork(stringify!($xs))),)*
}
}
}
}
random_unions!(
(pub),
Union2,
RandomUnion2s,
random_union2s,
2,
[0, X, I, A, xs, xs_gen],
[1, Y, J, B, ys, ys_gen]
);