Eric Fiselier | 13858ee | 2015-03-17 18:28:14 +0000 | [diff] [blame] | 1 | // -*- C++ -*- |
| 2 | //===----------------------------- tuple ----------------------------------===// |
| 3 | // |
| 4 | // The LLVM Compiler Infrastructure |
| 5 | // |
| 6 | // This file is dual licensed under the MIT and the University of Illinois Open |
| 7 | // Source Licenses. See LICENSE.TXT for details. |
| 8 | // |
| 9 | //===----------------------------------------------------------------------===// |
| 10 | |
| 11 | #ifndef _LIBCPP_EXPERIMENTAL_TUPLE |
| 12 | #define _LIBCPP_EXPERIMENTAL_TUPLE |
| 13 | |
| 14 | /* |
| 15 | experimental/tuple synopsis |
| 16 | |
| 17 | // C++1y |
| 18 | |
| 19 | #include <tuple> |
| 20 | |
| 21 | namespace std { |
| 22 | namespace experimental { |
| 23 | inline namespace fundamentals_v1 { |
| 24 | |
| 25 | // See C++14 20.4.2.5, tuple helper classes |
| 26 | template <class T> constexpr size_t tuple_size_v |
| 27 | = tuple_size<T>::value; |
| 28 | |
| 29 | // 3.2.2, Calling a function with a tuple of arguments |
| 30 | template <class F, class Tuple> |
| 31 | constexpr decltype(auto) apply(F&& f, Tuple&& t); |
| 32 | |
| 33 | } // namespace fundamentals_v1 |
| 34 | } // namespace experimental |
| 35 | } // namespace std |
| 36 | |
| 37 | */ |
| 38 | |
| 39 | # include <experimental/__config> |
| 40 | |
| 41 | #if _LIBCPP_STD_VER > 11 |
| 42 | |
| 43 | # include <tuple> |
| 44 | # include <utility> |
| 45 | # include <__functional_base> |
| 46 | |
| 47 | #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| 48 | #pragma GCC system_header |
| 49 | #endif |
| 50 | |
| 51 | _LIBCPP_BEGIN_NAMESPACE_LFTS |
| 52 | |
| 53 | #ifndef _LIBCPP_HAS_NO_VARIABLE_TEMPLATES |
| 54 | template <class _Tp> |
| 55 | _LIBCPP_CONSTEXPR size_t tuple_size_v = tuple_size<_Tp>::value; |
| 56 | #endif |
| 57 | |
| 58 | template <class _Fn, class _Tuple, size_t ..._Id> |
Eric Fiselier | c254b36 | 2015-04-19 15:32:52 +0000 | [diff] [blame] | 59 | inline _LIBCPP_INLINE_VISIBILITY |
Eric Fiselier | 13858ee | 2015-03-17 18:28:14 +0000 | [diff] [blame] | 60 | decltype(auto) __apply_tuple_impl(_Fn && __f, _Tuple && __t, |
| 61 | integer_sequence<size_t, _Id...>) { |
Dan Albert | 1d4a1ed | 2016-05-25 22:36:09 -0700 | [diff] [blame^] | 62 | return _VSTD::__invoke( |
Eric Fiselier | 13858ee | 2015-03-17 18:28:14 +0000 | [diff] [blame] | 63 | _VSTD::forward<_Fn>(__f), |
| 64 | _VSTD::get<_Id>(_VSTD::forward<_Tuple>(__t))... |
| 65 | ); |
| 66 | } |
| 67 | |
| 68 | template <class _Fn, class _Tuple> |
| 69 | inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 |
| 70 | decltype(auto) apply(_Fn && __f, _Tuple && __t) { |
| 71 | return _VSTD_LFTS::__apply_tuple_impl( |
| 72 | _VSTD::forward<_Fn>(__f), _VSTD::forward<_Tuple>(__t), |
| 73 | make_index_sequence<tuple_size<typename decay<_Tuple>::type>::value>() |
| 74 | ); |
| 75 | } |
| 76 | |
| 77 | _LIBCPP_END_NAMESPACE_LFTS |
| 78 | |
| 79 | #endif /* _LIBCPP_STD_VER > 11 */ |
| 80 | |
| 81 | #endif /* _LIBCPP_EXPERIMENTAL_TUPLE */ |