Add call function to transform a tuple into function arguments

sol/tuple.hpp

@@ -0,0 +1,53 @@
+// 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
+// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+#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