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map_utils.h

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    map_utils.h 2.01 KiB
    /*
     *  Copyright (C) 2017-2019 Savoir-faire Linux Inc.
     *
     *  Author: Guillaume Roguez <guillaume.roguez@savoirfairelinux.com>
     *
     *  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, write to the Free Software
     *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA.
     */
    
    #pragma once
    
    #include <vector>
    #include <iterator>
    #include <algorithm>
    #include <tuple>
    
    namespace jami { namespace map_utils {
    
    ///< Return the N-th type of a tuple type used as the Container compliant value type
    template <typename C, std::size_t N>
    using type_element = typename std::remove_cv<typename std::tuple_element<N, typename C::value_type>::type>::type;
    
    ///< Extract in a std::vector object each N-th values of tuples contained in a Container compliant object \a container.
    template <std::size_t N, typename C>
    inline std::vector<type_element<C, N>>
    extractElements(const C& container)
    {
        std::vector<type_element<C, N>> result;
        if (container.size() > 0) {
            result.resize(container.size());
            auto iter = std::begin(container);
            std::generate(std::begin(result), std::end(result), [&]{ return std::get<N>(*iter++); });
        }
        return result;
    }
    
    template <typename M>
    inline auto
    extractKeys(const M& map) -> decltype(extractElements<0>(map))
    { return extractElements<0>(map); }
    
    template <typename M>
    inline auto
    extractValues(const M& map) -> decltype(extractElements<1>(map))
    { return extractElements<1>(map); }
    
    }} // namespace jami::map_utils