malachite_q/rational_vector/conversion/from_natural_vector.rs
1// Copyright © 2026 Mikhail Hogrefe
2//
3// This file is part of Malachite.
4//
5// Malachite is free software: you can redistribute it and/or modify it under the terms of the GNU
6// Lesser General Public License (LGPL) as published by the Free Software Foundation; either version
7// 3 of the License, or (at your option) any later version. See <https://www.gnu.org/licenses/>.
8
9use crate::Rational;
10use crate::rational_vector::RationalVector;
11use malachite_nz::natural_vector::NaturalVector;
12
13impl From<NaturalVector> for RationalVector {
14 /// Converts a [`NaturalVector`] to a [`RationalVector`].
15 ///
16 /// Every [`Natural`](malachite_nz::natural::Natural) is a [`Rational`], so nothing is lost and
17 /// nothing can fail. The elements are converted one by one, each with denominator 1, so the
18 /// dimension is unchanged.
19 ///
20 /// # Worst-case complexity
21 /// $T(n) = O(n)$
22 ///
23 /// $M(n) = O(n)$
24 ///
25 /// where $T$ is time, $M$ is additional memory, and $n$ is `v.dimension()`.
26 ///
27 /// # Examples
28 /// ```
29 /// use core::str::FromStr;
30 /// use malachite_nz::natural_vector::NaturalVector;
31 /// use malachite_q::rational_vector::RationalVector;
32 ///
33 /// let v = NaturalVector::from_str("(1, 2, 3)").unwrap();
34 /// assert_eq!(RationalVector::from(v).to_string(), "(1, 2, 3)");
35 ///
36 /// assert_eq!(
37 /// RationalVector::from(NaturalVector::from_str("()").unwrap()).to_string(),
38 /// "()"
39 /// );
40 /// ```
41 #[inline]
42 fn from(v: NaturalVector) -> Self {
43 Self {
44 elements: v.elements.into_iter().map(Rational::from).collect(),
45 }
46 }
47}