#ifndef _LIBCPP_EXPERIMENTAL_TUPLE
#define _LIBCPP_EXPERIMENTAL_TUPLE
# 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
decltype(auto) __apply_tuple_impl(_Fn && __f, _Tuple && __t,
integer_sequence<size_t, _Id...>) {
return _VSTD::__invoke(
_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
#endif