/usr/include/mapnik/expression_string.hpp is in libmapnik-dev 2.2.0+ds1-6build2.
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) 2011 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_STRING_HPP
#define MAPNIK_EXPRESSION_STRING_HPP
// mapnik
#include <mapnik/config.hpp>
#include <mapnik/expression_node_types.hpp>
// boost
#include <boost/shared_ptr.hpp>
// stl
#include <string>
#include <stdexcept>
namespace mapnik
{
MAPNIK_DECL std::string to_expression_string(expr_node const& node);
/*
The following two templates are intentionally invalid and will prompt
a compile error if ever instantiated. This should prevent accidentally
passing a pointer (either raw or shared) as the argument. Without them,
the compiler could construct a temporary expr_node(bool) using
implicit pointer-to-bool conversion, thus any non-null pointer
would yield "true".
*/
template <typename T>
std::string to_expression_string(T const* expr_node_ptr)
{
throw std::logic_error("to_expression_string() called with pointer argument");
// compile error intended here; comment on the next line shows in clang output
return expr_node_ptr; // to_expression_string() called with pointer argument
}
template <typename T>
std::string to_expression_string(boost::shared_ptr<T> const& expr_node_ptr)
{
throw std::logic_error("to_expression_string() called with pointer argument");
// compile error intended here; comment on the next line shows in clang output
return expr_node_ptr; // to_expression_string() called with pointer argument
}
}
#endif // MAPNIK_EXPRESSION_STRING_HPP
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