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> 59 inline _LIBCPP_INLINE_VISIBILITY 60 _LIBCPP_CONSTEXPR_AFTER_CXX11 61 decltype(auto) __apply_tuple_impl(_Fn && __f, _Tuple && __t, 62 integer_sequence<size_t, _Id...>) { 63 return _VSTD::__invoke_constexpr( 64 _VSTD::forward<_Fn>(__f), 65 _VSTD::get<_Id>(_VSTD::forward<_Tuple>(__t))... 66 ); 67 } 68 69 template <class _Fn, class _Tuple> 70 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 71 decltype(auto) apply(_Fn && __f, _Tuple && __t) { 72 return _VSTD_LFTS::__apply_tuple_impl( 73 _VSTD::forward<_Fn>(__f), _VSTD::forward<_Tuple>(__t), 74 make_index_sequence<tuple_size<typename decay<_Tuple>::type>::value>() 75 ); 76 } 77 78 _LIBCPP_END_NAMESPACE_LFTS 79 80 #endif /* _LIBCPP_STD_VER > 11 */ 81 82 #endif /* _LIBCPP_EXPERIMENTAL_TUPLE */ 83
