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// Copyright © 2026 Mikhail Hogrefe
//
// This file is part of Malachite.
//
// Malachite is free software: you can redistribute it and/or modify it under the terms of the GNU
// Lesser General Public License (LGPL) as published by the Free Software Foundation; either version
// 3 of the License, or (at your option) any later version. See <https://www.gnu.org/licenses/>.
use crate::natural::Natural;
use crate::natural_vector::NaturalVector;
use malachite_base::num::arithmetic::traits::ElementSum;
impl ElementSum for NaturalVector {
type Output = Natural;
/// Returns the sum of the elements of a [`NaturalVector`], taking the vector by reference.
///
/// The 0-dimensional vector has no elements, and their sum is 0.
///
/// $$
/// f(v) = \sum_i v_i.
/// $$
///
/// # Worst-case complexity
/// $T(n) = O(n)$
///
/// $M(n) = O(n)$
///
/// where $T$ is time, $M$ is additional memory, and $n$ is the total number of bits of the
/// elements.
///
/// # Examples
/// ```
/// use core::str::FromStr;
/// use malachite_base::num::arithmetic::traits::ElementSum;
/// use malachite_nz::natural_vector::NaturalVector;
///
/// assert_eq!(
/// NaturalVector::from_str("(1, 3, 2)")
/// .unwrap()
/// .to_element_sum(),
/// 6
/// );
/// assert_eq!(NaturalVector::from_str("()").unwrap().to_element_sum(), 0);
/// ```
///
/// This is equivalent to `_fmpz_vec_sum` from `fmpz_vec/sum.c`, FLINT 3.6.0.
#[inline]
fn to_element_sum(&self) -> Natural {
self.elements.iter().sum()
}
/// Returns the sum of the elements of a [`NaturalVector`], taking the vector by value.
///
/// The 0-dimensional vector has no elements, and their sum is 0.
///
/// $$
/// f(v) = \sum_i v_i.
/// $$
///
/// # Worst-case complexity
/// $T(n) = O(n)$
///
/// $M(n) = O(n)$
///
/// where $T$ is time, $M$ is additional memory, and $n$ is the total number of bits of the
/// elements.
///
/// # Examples
/// ```
/// use core::str::FromStr;
/// use malachite_base::num::arithmetic::traits::ElementSum;
/// use malachite_nz::natural_vector::NaturalVector;
///
/// assert_eq!(
/// NaturalVector::from_str("(1, 3, 2)")
/// .unwrap()
/// .into_element_sum(),
/// 6
/// );
/// assert_eq!(NaturalVector::from_str("()").unwrap().into_element_sum(), 0);
/// ```
///
/// This is equivalent to `_fmpz_vec_sum` from `fmpz_vec/sum.c`, FLINT 3.6.0.
#[inline]
fn into_element_sum(self) -> Natural {
self.elements.into_iter().sum()
}
}