84 lines
2.7 KiB
C++
84 lines
2.7 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) 2012 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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// mapnik
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#include <mapnik/boolean.hpp>
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#include <mapnik/params.hpp>
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#include <mapnik/value_types.hpp>
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// boost
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#include <boost/variant/static_visitor.hpp>
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#include <boost/variant/apply_visitor.hpp>
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#include <boost/lexical_cast.hpp>
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#include <boost/none.hpp>
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#include <boost/optional.hpp>
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namespace mapnik {
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namespace params_detail {
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template <typename T>
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struct converter
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{
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typedef boost::optional<T> return_type;
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static return_type extract(parameters const& params,
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std::string const& name,
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boost::optional<T> const& default_opt_value)
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{
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boost::optional<T> result(default_opt_value);
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parameters::const_iterator itr = params.find(name);
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if (itr != params.end())
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{
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boost::apply_visitor(value_extractor_visitor<T>(result),itr->second);
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}
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return result;
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}
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};
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} // end namespace params_detail
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// parameters
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parameters::parameters() {}
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template <typename T>
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boost::optional<T> parameters::get(std::string const& key) const
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{
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return params_detail::converter<T>::extract(*this,key, boost::none);
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}
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template <typename T>
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boost::optional<T> parameters::get(std::string const& key, T const& default_opt_value) const
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{
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return params_detail::converter<T>::extract(*this,key,boost::optional<T>(default_opt_value));
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}
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#define compile_params_get(T) template boost::optional<T> parameters::get(std::string const& key) const; template boost::optional<T> parameters::get(std::string const& key, T const& default_opt_value) const
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compile_params_get(std::string);
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compile_params_get(value_double);
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compile_params_get(int);
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#ifdef BIGINT
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compile_params_get(value_integer);
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#endif
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compile_params_get(mapnik::boolean);
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}
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