72 lines
2.1 KiB
C++
72 lines
2.1 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) 2011 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_FACTORY_HPP
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#define MAPNIK_FACTORY_HPP
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// mapnik
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#include <mapnik/utils.hpp>
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// stl
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#include <stdexcept>
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#include <map>
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namespace mapnik {
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template
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<
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typename product_type,
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typename key_type,
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typename ...Args >
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class factory : public singleton<factory <product_type,
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key_type,
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Args...> >
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{
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private:
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typedef product_type* (*product_creator)(Args...);
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typedef std::map<key_type,product_creator> product_map;
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product_map map_;
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public:
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bool register_product(key_type const& key, product_creator creator)
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{
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return map_.insert(typename product_map::value_type(key,creator)).second;
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}
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bool unregister_product(const key_type& key)
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{
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return map_.erase(key)==1;
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}
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product_type* create_object(key_type const& key, Args...args)
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{
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typename product_map::const_iterator pos=map_.find(key);
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if (pos!=map_.end())
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{
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return (pos->second)(args...);
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}
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return 0;
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}
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};
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}
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#endif // MAPNIK_FACTORY_HPP
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