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69 lines
2.8 KiB
69 lines
2.8 KiB
/*************************************************************************** |
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* Copyright (C) 2008-2021 by Andrzej Rybczak * |
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* andrzej@rybczak.net * |
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* * |
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* This program is free software; you can redistribute it and/or modify * |
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* it under the terms of the GNU General Public License as published by * |
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* the Free Software Foundation; either version 2 of the License, or * |
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* (at your option) any later version. * |
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* * |
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* This program is distributed in the hope that it will be useful, * |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of * |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * |
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* GNU General Public License for more details. * |
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* * |
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* You should have received a copy of the GNU General Public License * |
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* along with this program; if not, write to the * |
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* Free Software Foundation, Inc., * |
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* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. * |
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***************************************************************************/ |
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#ifndef NCMPCPP_HELPERS_SONG_ITERATOR_MAKER_H |
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#define NCMPCPP_HELPERS_SONG_ITERATOR_MAKER_H |
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#include <boost/iterator/transform_iterator.hpp> |
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#include "curses/menu.h" |
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#include "song_list.h" |
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template <typename SongT> |
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struct SongPropertiesExtractor |
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{ |
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template <typename ItemT> |
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auto &operator()(ItemT &item) const |
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{ |
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return m_cache.assign(&item.properties(), &item.value()); |
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} |
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private: |
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mutable SongProperties m_cache; |
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}; |
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template <typename IteratorT> |
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SongIterator makeSongIterator(IteratorT it) |
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{ |
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typedef SongPropertiesExtractor< |
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typename IteratorT::value_type::Type |
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> Extractor; |
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static_assert( |
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std::is_convertible< |
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typename std::result_of<Extractor(typename IteratorT::reference)>::type, |
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SongProperties & |
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>::value, "invalid result type of SongPropertiesExtractor"); |
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return SongIterator(boost::make_transform_iterator(it, Extractor{})); |
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} |
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template <typename ConstIteratorT> |
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ConstSongIterator makeConstSongIterator(ConstIteratorT it) |
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{ |
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typedef SongPropertiesExtractor< |
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typename ConstIteratorT::value_type::Type |
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> Extractor; |
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static_assert( |
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std::is_convertible< |
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typename std::result_of<Extractor(typename ConstIteratorT::reference)>::type, |
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const SongProperties & |
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>::value, "invalid result type of SongPropertiesExtractor"); |
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return ConstSongIterator(boost::make_transform_iterator(it, Extractor{})); |
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} |
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#endif // NCMPCPP_HELPERS_SONG_ITERATOR_MAKER_H
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