OpenPRA Documentation

packages/engine/scram-node/src/ext/variant.h ​

Extra helper functions for std::variant.

Source code ​

cpp
/*
 * Copyright (C) 2014-2018 Olzhas Rakhimov
 * Copyright (C) 2023 OpenPRA ORG Inc.
 *
 * This program 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.
 *
 * 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
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */


#pragma once

#include <variant>

namespace ext {

template <typename T, typename... Ts>
T as(const std::variant<Ts...>& var) {
  return std::visit([](auto& arg) { return static_cast<T>(arg); }, var);
}

template <typename... Ts>
void swap(std::variant<Ts...>& lhs, std::variant<Ts...>& rhs) noexcept {
#if __GNUC__ == 8 && __GNUC_MINOR__ < 3
  auto tmp = std::move(rhs);
  rhs = std::move(lhs);
  lhs = std::move(tmp);
#else
  lhs.swap(rhs);
#endif
}

}  // namespace ext

Updated on 2025-11-11 at 16:51:08 +0000