/**
 *    Copyright (C) 2022-present MongoDB, Inc.
 *
 *    This program is free software: you can redistribute it and/or modify
 *    it under the terms of the Server Side Public License, version 1,
 *    as published by MongoDB, Inc.
 *
 *    This program 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
 *    Server Side Public License for more details.
 *
 *    You should have received a copy of the Server Side Public License
 *    along with this program. If not, see
 *    <http://www.mongodb.com/licensing/server-side-public-license>.
 *
 *    As a special exception, the copyright holders give permission to link the
 *    code of portions of this program with the OpenSSL library under certain
 *    conditions as described in each individual source file and distribute
 *    linked combinations including the program with the OpenSSL library. You
 *    must comply with the Server Side Public License in all respects for
 *    all of the code used other than as permitted herein. If you modify file(s)
 *    with this exception, you may extend this exception to your version of the
 *    file(s), but you are not obligated to do so. If you do not wish to do so,
 *    delete this exception statement from your version. If you delete this
 *    exception statement from all source files in the program, then also delete
 *    it in the license file.
 */

#pragma once

#include <algorithm>
#include <set>

#include "mongo/bson/util/builder_fwd.h"

namespace mongo::set_util {

template <typename T, typename Comparator>
std::set<T, Comparator> setUnion(const std::set<T, Comparator>& set1,
                                 const std::set<T, Comparator>& set2) {
    std::set<T, Comparator> out;
    std::set_union(
        set1.begin(), set1.end(), set2.begin(), set2.end(), std::inserter(out, out.begin()));
    return out;
}

template <typename T, typename Comparator>
std::string setToString(const std::set<T, Comparator>& set) {
    StackStringBuilder sb;
    sb << "{";
    for (auto it = set.begin(); it != set.end(); ++it) {
        sb << *it;
        if (std::next(it) != set.end())
            sb << ",";
    }
    sb << "}";
    return sb.str();
}

}  // namespace mongo::set_util