/usr/include/mapnik/params.hpp is in libmapnik2-dev 2.0.0+ds1-3build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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*
* This file is part of Mapnik (c++ mapping toolkit)
*
* Copyright (C) 2006 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
*
*****************************************************************************/
//$Id: params.hpp 39 2005-04-10 20:39:53Z pavlenko $
#ifndef PARAMS_HPP
#define PARAMS_HPP
#include <boost/variant.hpp>
#include <boost/optional.hpp>
#include <boost/none.hpp>
#include <boost/lexical_cast.hpp>
#include <string>
#include <map>
namespace mapnik
{
typedef boost::variant<int,double,std::string> value_holder;
typedef std::pair<const std::string, value_holder> parameter;
typedef std::map<const std::string, value_holder> param_map;
template <typename T>
struct value_extractor_visitor : public boost::static_visitor<>
{
value_extractor_visitor(boost::optional<T> & var)
:var_(var) {}
void operator () (T val) const
{
var_ = val;
}
template <typename T1>
void operator () (T1 val) const
{
try
{
var_ = boost::lexical_cast<T>(val);
}
catch (boost::bad_lexical_cast & ) {}
}
boost::optional<T> & var_;
};
class parameters : public param_map
{
template <typename T>
struct converter
{
typedef boost::optional<T> return_type;
static return_type extract(parameters const& params,
std::string const& name,
boost::optional<T> const& default_value)
{
boost::optional<T> result(default_value);
parameters::const_iterator itr = params.find(name);
if (itr != params.end())
{
boost::apply_visitor(value_extractor_visitor<T>(result),itr->second);
}
return result;
}
};
public:
parameters() {}
template <typename T>
boost::optional<T> get(std::string const& key) const
{
return converter<T>::extract(*this,key, boost::none);
}
template <typename T>
boost::optional<T> get(std::string const& key, T const& default_value) const
{
return converter<T>::extract(*this,key,boost::optional<T>(default_value));
}
};
}
#endif //PARAMS_HPP
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