sol2/sol/tuple.hpp

// The MIT License (MIT)

// Copyright (c) 2013 Danny Y., Rapptz

// Permission is hereby granted, free of charge, to any person obtaining a copy of
// this software and associated documentation files (the "Software"), to deal in
// the Software without restriction, including without limitation the rights to
// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
// the Software, and to permit persons to whom the Software is furnished to do so,
// subject to the following conditions:

// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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#ifndef SOL_TUPLE_HPP
#define SOL_TUPLE_HPP

#include <tuple>
#include <cstddef>

namespace sol {
namespace detail {
template<size_t... Ns>
struct indices {};

template<size_t N, size_t... Ns>
struct build_indices : build_indices<N-1, N-1, Ns...> {};

template<size_t... Ns>
struct build_indices<0, Ns...> : indices<Ns...> {};

using std::get;

template<typename Function, typename Tuple, size_t... Indices>
inline auto call(Function f, const Tuple& t, indices<Indices...>) -> decltype(f(get<Indices>(t)...)) {
    return f(get<Indices>(t)...);
}
} // detail

template<typename Function, typename... Args>
inline auto call(Function f, const std::tuple<Args...>& t) -> decltype(detail::call(f, t, detail::build_indices<sizeof...(Args)>{})) {
    return call(f, t, detail::build_indices<sizeof...(Args)>{});
}
} // sol

#endif // SOL_TUPLE_HPP