72 lines
2.1 KiB
C++
72 lines
2.1 KiB
C++
/*****************************************************************************
|
|
*
|
|
* This file is part of Mapnik (c++ mapping toolkit)
|
|
*
|
|
* Copyright (C) 2017 Artem Pavlenko
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* This library 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
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with this library; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*
|
|
*****************************************************************************/
|
|
|
|
#ifndef MAPNIK_FACTORY_HPP
|
|
#define MAPNIK_FACTORY_HPP
|
|
|
|
// mapnik
|
|
#include <mapnik/util/singleton.hpp>
|
|
|
|
// stl
|
|
#include <stdexcept>
|
|
#include <map>
|
|
|
|
namespace mapnik {
|
|
|
|
template
|
|
<
|
|
typename product_type,
|
|
typename key_type,
|
|
typename ...Args >
|
|
class factory : public singleton<factory <product_type,
|
|
key_type,
|
|
Args...> >
|
|
{
|
|
private:
|
|
using product_creator = product_type* (*) (Args...);
|
|
using product_map = std::map<key_type,product_creator>;
|
|
product_map map_;
|
|
public:
|
|
|
|
bool register_product(key_type const& key, product_creator creator)
|
|
{
|
|
return map_.insert(typename product_map::value_type(key,creator)).second;
|
|
}
|
|
|
|
bool unregister_product(const key_type& key)
|
|
{
|
|
return map_.erase(key)==1;
|
|
}
|
|
|
|
product_type* create_object(key_type const& key, Args...args)
|
|
{
|
|
typename product_map::const_iterator pos=map_.find(key);
|
|
if (pos!=map_.end())
|
|
{
|
|
return (pos->second)(args...);
|
|
}
|
|
return 0;
|
|
}
|
|
};
|
|
}
|
|
|
|
#endif // MAPNIK_FACTORY_HPP
|