93 lines
2.5 KiB
C++
93 lines
2.5 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) 2013 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_SYMBOLIZER_HASH_HPP
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#define MAPNIK_SYMBOLIZER_HASH_HPP
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// mapnik
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#include <mapnik/symbolizer.hpp>
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// boost
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#include <boost/variant/static_visitor.hpp>
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// stl
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#include <typeinfo>
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#include <typeindex>
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#include <functional>
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namespace mapnik {
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struct property_value_hash_visitor : boost::static_visitor<std::size_t>
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{
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std::size_t operator() (color val) const
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{
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return val.rgba();
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}
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std::size_t operator() (transform_type const& val) const
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{
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return 0; //FIXME
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}
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std::size_t operator() (enumeration_wrapper const& val) const
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{
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return 0; //FIXME
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}
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std::size_t operator() (dash_array const& val) const
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{
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return 0; //FIXME
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}
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template <typename T>
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std::size_t operator() (T const& val) const
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{
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return std::hash<T>()(val);
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}
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};
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struct symbolizer_hash
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{
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template <typename T>
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static std::size_t value(T const& sym)
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{
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std::size_t seed = std::hash<std::type_index>()(typeid(sym));
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for (auto const& prop : sym.properties)
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{
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seed ^= std::hash<std::size_t>()(static_cast<std::size_t>(prop.first));
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seed ^= boost::apply_visitor(property_value_hash_visitor(), prop.second);
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}
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return seed;
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}
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};
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struct hash_visitor : boost::static_visitor<std::size_t>
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{
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template <typename Symbolizer>
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std::size_t operator() (Symbolizer const& sym) const
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{
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return symbolizer_hash::value(sym);
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}
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};
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} // namespace mapnik
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#endif // MAPNIK_SYMBOLIZER_HASH_HPP
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