Line data    Source code

       1             : /*
       2             :  *  Copyright (C) 2004-2024 Savoir-faire Linux Inc.
       3             :  *
       4             :  *  Author: Guillaume Roguez <guillaume.roguez@savoirfairelinux.com>
       5             :  *
       6             :  *  This program is free software; you can redistribute it and/or modify
       7             :  *  it under the terms of the GNU General Public License as published by
       8             :  *  the Free Software Foundation; either version 3 of the License, or
       9             :  *  (at your option) any later version.
      10             :  *
      11             :  *  This program is distributed in the hope that it will be useful,
      12             :  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
      13             :  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      14             :  *  GNU General Public License for more details.
      15             :  *
      16             :  *  You should have received a copy of the GNU General Public License
      17             :  *  along with this program; if not, write to the Free Software
      18             :  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA.
      19             :  */
      20             : 
      21             : #pragma once
      22             : 
      23             : #include <vector>
      24             : #include <iterator>
      25             : #include <algorithm>
      26             : #include <tuple>
      27             : 
      28             : namespace jami {
      29             : namespace map_utils {
      30             : 
      31             : ///< Return the N-th type of a tuple type used as the Container compliant value type
      32             : template<typename C, std::size_t N>
      33             : using type_element =
      34             :     typename std::remove_cv<typename std::tuple_element<N, typename C::value_type>::type>::type;
      35             : 
      36             : ///< Extract in a std::vector object each N-th values of tuples contained in a Container compliant
      37             : ///< object \a container.
      38             : template<std::size_t N, typename C>
      39             : inline std::vector<type_element<C, N>>
      40           2 : extractElements(const C& container)
      41             : {
      42           2 :     std::vector<type_element<C, N>> result;
      43           2 :     if (container.size() > 0) {
      44           2 :         result.resize(container.size());
      45           2 :         auto iter = std::begin(container);
      46          17 :         std::generate(std::begin(result), std::end(result), [&] { return std::get<N>(*iter++); });
      47             :     }
      48           2 :     return result;
      49           0 : }
      50             : 
      51             : template<typename M>
      52             : inline auto
      53           1 : extractKeys(const M& map) -> decltype(extractElements<0>(map))
      54             : {
      55           1 :     return extractElements<0>(map);
      56             : }
      57             : 
      58             : template<typename M>
      59             : inline auto
      60           1 : extractValues(const M& map) -> decltype(extractElements<1>(map))
      61             : {
      62           1 :     return extractElements<1>(map);
      63             : }
      64             : 
      65             : } // namespace map_utils
      66             : } // namespace jami