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+// -*- C++ -*-
+//===----------------------------- tuple ----------------------------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP_EXPERIMENTAL_TUPLE
+#define _LIBCPP_EXPERIMENTAL_TUPLE
+
+/*
+ experimental/tuple synopsis
+
+// C++1y
+
+#include <tuple>
+
+namespace std {
+namespace experimental {
+inline namespace fundamentals_v1 {
+
+ // See C++14 20.4.2.5, tuple helper classes
+ template <class T> constexpr size_t tuple_size_v
+ = tuple_size<T>::value;
+
+ // 3.2.2, Calling a function with a tuple of arguments
+ template <class F, class Tuple>
+ constexpr decltype(auto) apply(F&& f, Tuple&& t);
+
+} // namespace fundamentals_v1
+} // namespace experimental
+} // namespace std
+
+ */
+
+# include <experimental/__config>
+
+#if _LIBCPP_STD_VER > 11
+
+# include <tuple>
+# include <utility>
+# include <__functional_base>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#pragma GCC system_header
+#endif
+
+_LIBCPP_BEGIN_NAMESPACE_LFTS
+
+#ifndef _LIBCPP_HAS_NO_VARIABLE_TEMPLATES
+template <class _Tp>
+_LIBCPP_CONSTEXPR size_t tuple_size_v = tuple_size<_Tp>::value;
+#endif
+
+template <class _Fn, class _Tuple, size_t ..._Id>
+inline _LIBCPP_INLINE_VISIBILITY
+_LIBCPP_CONSTEXPR_AFTER_CXX11
+decltype(auto) __apply_tuple_impl(_Fn && __f, _Tuple && __t,
+ integer_sequence<size_t, _Id...>) {
+ return _VSTD::__invoke_constexpr(
+ _VSTD::forward<_Fn>(__f),
+ _VSTD::get<_Id>(_VSTD::forward<_Tuple>(__t))...
+ );
+}
+
+template <class _Fn, class _Tuple>
+inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+decltype(auto) apply(_Fn && __f, _Tuple && __t) {
+ return _VSTD_LFTS::__apply_tuple_impl(
+ _VSTD::forward<_Fn>(__f), _VSTD::forward<_Tuple>(__t),
+ make_index_sequence<tuple_size<typename decay<_Tuple>::type>::value>()
+ );
+}
+
+_LIBCPP_END_NAMESPACE_LFTS
+
+#endif /* _LIBCPP_STD_VER > 11 */
+
+#endif /* _LIBCPP_EXPERIMENTAL_TUPLE */