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59 lines
1.7 KiB
C++
59 lines
1.7 KiB
C++
/*****************************************************************************
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*
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* This file is part of Mapnik (c++ mapping toolkit)
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*
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* Copyright (C) 2025 Artem Pavlenko
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*****************************************************************************/
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#ifndef MAPNIK_FILTER_FEATURESET_HPP
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#define MAPNIK_FILTER_FEATURESET_HPP
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// mapnik
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#include <mapnik/featureset.hpp>
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#include <mapnik/feature.hpp>
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namespace mapnik {
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template<typename T>
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class filter_featureset : public Featureset
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{
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using filter_type = T;
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public:
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filter_featureset(featureset_ptr const& fs, filter_type&& filter)
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: fs_(fs),
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filter_(std::move(filter))
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{}
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feature_ptr next()
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{
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feature_ptr feature = fs_->next();
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while (feature && !filter_.pass(*feature))
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{
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feature = fs_->next();
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}
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return feature;
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}
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private:
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featureset_ptr fs_;
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filter_type filter_;
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};
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} // namespace mapnik
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#endif // MAPNIK_FILTER_FEATURESET_HPP
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