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/*****************************************************************************
*
* This file is part of Mapnik (c++ mapping toolkit)
*
* Copyright (C) 2014 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_PARAMS_HPP
#define MAPNIK_PARAMS_HPP
// mapnik
#include <mapnik/config.hpp>
#include <mapnik/value_types.hpp>
#include <mapnik/util/variant.hpp>
// boost
#include <boost/optional.hpp>
// stl
#include <string>
#include <map>
namespace mapnik
{
// fwd declare
class boolean_type;
using value_holder_base = util::variant<value_null,value_integer,value_double,std::string,value_bool>;
struct value_holder : value_holder_base
{
// default
value_holder()
: value_holder_base() {}
// perfect forwarding
template <typename T>
value_holder(T && obj) noexcept
: value_holder_base(std::forward<T>(obj))
{}
};
using parameter = std::pair<std::string, value_holder>;
using param_map = std::map<std::string, value_holder>;
class MAPNIK_DECL parameters : public param_map
{
public:
parameters() {}
template <typename T>
boost::optional<T> get(std::string const& key) const;
template <typename T>
boost::optional<T> get(std::string const& key, T const& default_opt_value) const;
};
#ifdef _MSC_VER
template MAPNIK_DECL
boost::optional<std::string> parameters::get(std::string const& key) const;
template MAPNIK_DECL
boost::optional<std::string> parameters::get(std::string const& key,
std::string const& default_opt_value) const;
template MAPNIK_DECL
boost::optional<value_double> parameters::get(std::string const& key) const;
template MAPNIK_DECL
boost::optional<value_double> parameters::get(std::string const& key,
value_double const& default_opt_value) const;
template MAPNIK_DECL
boost::optional<value_integer> parameters::get(std::string const& key) const;
template MAPNIK_DECL
boost::optional<value_integer> parameters::get(std::string const& key,
value_integer const& default_opt_value) const;
template MAPNIK_DECL
boost::optional<value_bool> parameters::get(std::string const& key) const;
template MAPNIK_DECL
boost::optional<value_bool> parameters::get(std::string const& key,
value_bool const& default_opt_value) const;
template MAPNIK_DECL
boost::optional<mapnik::boolean_type> parameters::get(std::string const& key) const;
template MAPNIK_DECL
boost::optional<mapnik::boolean_type> parameters::get(std::string const& key,
mapnik::boolean_type const& default_opt_value) const;
template MAPNIK_DECL
boost::optional<mapnik::value_null> parameters::get(std::string const& key) const;
template MAPNIK_DECL
boost::optional<mapnik::value_null> parameters::get(std::string const& key,
mapnik::value_null const& default_opt_value) const;
#endif
}
#endif // MAPNIK_PARAMS_HPP
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