/usr/include/mapnik/value_hash.hpp is in libmapnik-dev 3.0.12+ds-3.
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_VALUE_HASH_HPP
#define MAPNIK_VALUE_HASH_HPP
// mapnik
#include <mapnik/util/variant.hpp>
#include <mapnik/value_types.hpp>
// stl
#include <functional>
#pragma GCC diagnostic push
#include <mapnik/warning_ignore.hpp>
#include <unicode/unistr.h>
#pragma GCC diagnostic pop
namespace mapnik { namespace detail {
inline void hash_combine(std::size_t & seed, std::size_t val)
{
seed ^= val + 0x9e3779b9 + (seed << 6) + (seed >> 2);
}
struct value_hasher
{
std::size_t operator() (value_null val) const
{
return hash_value(val);
}
std::size_t operator() (value_unicode_string const& val) const
{
return static_cast<std::size_t>(val.hashCode());
}
std::size_t operator()(value_integer val) const
{
return static_cast<std::size_t>(val);
}
template <class T>
std::size_t operator()(T const& val) const
{
std::hash<T> hasher;
return hasher(val);
}
};
} // namespace detail
template <typename T>
std::size_t mapnik_hash_value(T const& val)
{
std::size_t seed = 0;
detail::hash_combine(seed, util::apply_visitor(detail::value_hasher(), val));
detail::hash_combine(seed, val.which());
return seed;
}
} // namespace mapnik
#endif // MAPNIK_VALUE_HASH_HPP
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