Line data    Source code

       1             : /*
       2             :  *  Copyright (C) 2004-2025 Savoir-faire Linux Inc.
       3             :  *
       4             :  *  This program is free software: you can redistribute it and/or modify
       5             :  *  it under the terms of the GNU General Public License as published by
       6             :  *  the Free Software Foundation, either version 3 of the License, or
       7             :  *  (at your option) any later version.
       8             :  *
       9             :  *  This program is distributed in the hope that it will be useful,
      10             :  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
      11             :  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
      12             :  *  GNU General Public License for more details.
      13             :  *
      14             :  *  You should have received a copy of the GNU General Public License
      15             :  *  along with this program. If not, see <https://www.gnu.org/licenses/>.
      16             :  */
      17             : #pragma once
      18             : 
      19             : #include <vector>
      20             : #include <iterator>
      21             : #include <algorithm>
      22             : #include <tuple>
      23             : 
      24             : namespace jami {
      25             : namespace map_utils {
      26             : 
      27             : ///< Return the N-th type of a tuple type used as the Container compliant value type
      28             : template<typename C, std::size_t N>
      29             : using type_element = typename std::remove_cv<typename std::tuple_element<N, typename C::value_type>::type>::type;
      30             : 
      31             : ///< Extract in a std::vector object each N-th values of tuples contained in a Container compliant
      32             : ///< object \a container.
      33             : template<std::size_t N, typename C>
      34             : inline std::vector<type_element<C, N>>
      35           2 : extractElements(const C& container)
      36             : {
      37           2 :     std::vector<type_element<C, N>> result;
      38           2 :     if (container.size() > 0) {
      39           2 :         result.resize(container.size());
      40           2 :         auto iter = std::begin(container);
      41          17 :         std::generate(std::begin(result), std::end(result), [&] { return std::get<N>(*iter++); });
      42             :     }
      43           2 :     return result;
      44           0 : }
      45             : 
      46             : template<typename M>
      47             : inline auto
      48           1 : extractKeys(const M& map) -> decltype(extractElements<0>(map))
      49             : {
      50           1 :     return extractElements<0>(map);
      51             : }
      52             : 
      53             : template<typename M>
      54             : inline auto
      55           1 : extractValues(const M& map) -> decltype(extractElements<1>(map))
      56             : {
      57           1 :     return extractElements<1>(map);
      58             : }
      59             : 
      60             : } // namespace map_utils
      61             : } // namespace jami