Acts/Utilities/Ranges.hpp

0001 // This file is part of the ACTS project.
0002 //
0003 // Copyright (C) 2016 CERN for the benefit of the ACTS project
0004 //
0005 // This Source Code Form is subject to the terms of the Mozilla Public
0006 // License, v. 2.0. If a copy of the MPL was not distributed with this
0007 // file, You can obtain one at https://mozilla.org/MPL/2.0/.
0008
0009 #pragma once
0010
0011 #include <ranges>
0012
0013 namespace Acts::Ranges {
0014
0015 /// Adaptor for converting a range to a container
0016 /// @tparam Container the container type to convert to
0017 template <template <typename...> class Container>
0018 struct to_adaptor {
0019   /// Convert a range to a container
0020   /// @tparam Range the range type to convert
0021   /// @param range the range to convert
0022   /// @return the converted container
0023   template <typename Range>
0024   auto operator()(Range&& range) const {
0025     using ValueType = std::ranges::range_value_t<Range>;
0026     return Container<ValueType>(std::ranges::begin(range),
0027                                 std::ranges::end(range));
0028   }
0029 };
0030
0031 /// Overload operator| for piping
0032 /// @tparam Range the range type to convert
0033 /// @tparam Container the container type to convert to
0034 /// @param range the range to convert
0035 /// @param adaptor the adaptor to use
0036 /// @return the converted container
0037 template <typename Range, template <typename...> class Container>
0038 auto operator|(Range&& range, to_adaptor<Container> adaptor) {
0039   return adaptor(std::forward<Range>(range));
0040 }
0041
0042 /// Create the adaptor objects
0043 /// @tparam Container the container type to convert to
0044 /// @return the adaptor object
0045 template <template <typename...> class Container>
0046 inline constexpr to_adaptor<Container> to{};
0047
0048 }  // namespace Acts::Ranges