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// Copyright (C) 2019-2020 Aleo Systems Inc.
// This file is part of the snarkOS library.

// The snarkOS library is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// The snarkOS library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with the snarkOS library. If not, see <https://www.gnu.org/licenses/>.

use std::{collections::HashSet, hash::Hash};

/// Returns true if the given iterator has duplicate elements.
pub fn has_duplicates<T>(iter: T) -> bool
where
    T: IntoIterator,
    T::Item: Eq + Hash,
{
    let mut uniq = HashSet::new();
    !iter.into_iter().all(move |x| uniq.insert(x))
}