container_func.hpp

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/*
 * This file is part of OpenTTD.
 * OpenTTD 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, version 2.
 * OpenTTD 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 OpenTTD. If not, see <http://www.gnu.org/licenses/>.
 */
 
#ifndef CONTAINER_FUNC_HPP
#define CONTAINER_FUNC_HPP
 
template <typename Container>
inline bool include(Container &container, typename Container::const_reference &item)
{
  const bool is_member = std::ranges::find(container, item) != container.end();
  if (!is_member) container.emplace_back(item);
  return is_member;
}
 
template <typename Container>
int find_index(Container const &container, typename Container::const_reference item)
{
  auto const it = std::ranges::find(container, item);
  if (it != container.end()) return std::distance(container.begin(), it);
 
  return -1;
}
 
template <typename TIter>
auto Slide(TIter first, TIter last, TIter position) -> std::pair<TIter, TIter>
{
  if (last < position) return { std::rotate(first, last, position), position };
  if (position < first) return { position, std::rotate(position, first, last) };
  return { first, last };
}
 
#endif /* CONTAINER_FUNC_HPP */