/usr/include/mapnik/util/variant.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_UTIL_VARIANT_HPP
#define MAPNIK_UTIL_VARIANT_HPP
#include <mapnik/config.hpp>
#include <mapbox/variant.hpp>
namespace mapnik { namespace util {
template <typename T>
using recursive_wrapper = typename mapbox::util::recursive_wrapper<T>;
template<typename... Types>
class variant : public mapbox::util::variant<Types...>
{
public:
// tell spirit that this is an adapted variant
struct adapted_variant_tag;
using types = std::tuple<Types...>;
// inherit ctor's
using mapbox::util::variant<Types...>::variant;
};
// unary visitor interface
// const
template <typename F, typename V>
auto VARIANT_INLINE static apply_visitor(F && f, V const& v) -> decltype(V::visit(v, std::forward<F>(f)))
{
return V::visit(v, std::forward<F>(f));
}
// non-const
template <typename F, typename V>
auto VARIANT_INLINE static apply_visitor(F && f, V & v) -> decltype(V::visit(v, std::forward<F>(f)))
{
return V::visit(v, std::forward<F>(f));
}
// binary visitor interface
// const
template <typename F, typename V>
auto VARIANT_INLINE static apply_visitor(F && f, V const& v0, V const& v1) -> decltype(V::binary_visit(v0, v1, std::forward<F>(f)))
{
return V::binary_visit(v0, v1, std::forward<F>(f));
}
// non-const
template <typename F, typename V>
auto VARIANT_INLINE static apply_visitor(F && f, V & v0, V & v1) -> decltype(V::binary_visit(v0, v1, std::forward<F>(f)))
{
return V::binary_visit(v0, v1, std::forward<F>(f));
}
// getter interface
template <typename ResultType, typename T>
ResultType & get(T & var)
{
return var.template get<ResultType>();
}
template <typename ResultType, typename T>
ResultType const& get(T const& var)
{
return var.template get<ResultType>();
}
}}
#endif // MAPNIK_UTIL_VARIANT_HPP
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