/usr/include/mapnik/expression.hpp is in libmapnik-dev 3.0.9+ds-1.
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) 2015 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_EXPRESSION_HPP
#define MAPNIK_EXPRESSION_HPP
// mapnik
#include <mapnik/config.hpp>
#include <mapnik/expression_node_types.hpp>
// boost
#include <memory>
// stl
#include <string>
#include <set>
namespace mapnik
{
// fwd declare to reduce compile time
using expression_ptr = std::shared_ptr<expr_node>;
using expression_set = std::set<expression_ptr>;
MAPNIK_DECL expression_ptr parse_expression (std::string const& wkt);
}
#endif // MAPNIK_EXPRESSION_HPP
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