106c3fb27SDimitry Andric //===----------------------------------------------------------------------===// 206c3fb27SDimitry Andric // 306c3fb27SDimitry Andric // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 406c3fb27SDimitry Andric // See https://llvm.org/LICENSE.txt for license information. 506c3fb27SDimitry Andric // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 606c3fb27SDimitry Andric // 706c3fb27SDimitry Andric //===----------------------------------------------------------------------===// 806c3fb27SDimitry Andric 906c3fb27SDimitry Andric #ifndef _LIBCPP___TUPLE_TUPLE_SIZE_H 1006c3fb27SDimitry Andric #define _LIBCPP___TUPLE_TUPLE_SIZE_H 1106c3fb27SDimitry Andric 1206c3fb27SDimitry Andric #include <__config> 1306c3fb27SDimitry Andric #include <__fwd/tuple.h> 1406c3fb27SDimitry Andric #include <__tuple/tuple_types.h> 1506c3fb27SDimitry Andric #include <__type_traits/is_const.h> 1606c3fb27SDimitry Andric #include <__type_traits/is_volatile.h> 1706c3fb27SDimitry Andric #include <cstddef> 1806c3fb27SDimitry Andric 1906c3fb27SDimitry Andric #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 2006c3fb27SDimitry Andric # pragma GCC system_header 2106c3fb27SDimitry Andric #endif 2206c3fb27SDimitry Andric 2306c3fb27SDimitry Andric _LIBCPP_BEGIN_NAMESPACE_STD 2406c3fb27SDimitry Andric 25cb14a3feSDimitry Andric template <class _Tp> 26cb14a3feSDimitry Andric struct _LIBCPP_TEMPLATE_VIS tuple_size; 2706c3fb27SDimitry Andric 2806c3fb27SDimitry Andric #if !defined(_LIBCPP_CXX03_LANG) 2906c3fb27SDimitry Andric template <class _Tp, class...> 3006c3fb27SDimitry Andric using __enable_if_tuple_size_imp = _Tp; 3106c3fb27SDimitry Andric 3206c3fb27SDimitry Andric template <class _Tp> 33cb14a3feSDimitry Andric struct _LIBCPP_TEMPLATE_VIS tuple_size<__enable_if_tuple_size_imp< const _Tp, 3406c3fb27SDimitry Andric __enable_if_t<!is_volatile<_Tp>::value>, 3506c3fb27SDimitry Andric integral_constant<size_t, sizeof(tuple_size<_Tp>)>>> 3606c3fb27SDimitry Andric : public integral_constant<size_t, tuple_size<_Tp>::value> {}; 3706c3fb27SDimitry Andric 3806c3fb27SDimitry Andric template <class _Tp> 39cb14a3feSDimitry Andric struct _LIBCPP_TEMPLATE_VIS tuple_size<__enable_if_tuple_size_imp< volatile _Tp, 4006c3fb27SDimitry Andric __enable_if_t<!is_const<_Tp>::value>, 4106c3fb27SDimitry Andric integral_constant<size_t, sizeof(tuple_size<_Tp>)>>> 4206c3fb27SDimitry Andric : public integral_constant<size_t, tuple_size<_Tp>::value> {}; 4306c3fb27SDimitry Andric 4406c3fb27SDimitry Andric template <class _Tp> 45cb14a3feSDimitry Andric struct _LIBCPP_TEMPLATE_VIS 46cb14a3feSDimitry Andric tuple_size<__enable_if_tuple_size_imp<const volatile _Tp, integral_constant<size_t, sizeof(tuple_size<_Tp>)>>> 4706c3fb27SDimitry Andric : public integral_constant<size_t, tuple_size<_Tp>::value> {}; 4806c3fb27SDimitry Andric 4906c3fb27SDimitry Andric #else 50cb14a3feSDimitry Andric template <class _Tp> 51cb14a3feSDimitry Andric struct _LIBCPP_TEMPLATE_VIS tuple_size<const _Tp> : public tuple_size<_Tp> {}; 52cb14a3feSDimitry Andric template <class _Tp> 53cb14a3feSDimitry Andric struct _LIBCPP_TEMPLATE_VIS tuple_size<volatile _Tp> : public tuple_size<_Tp> {}; 54cb14a3feSDimitry Andric template <class _Tp> 55cb14a3feSDimitry Andric struct _LIBCPP_TEMPLATE_VIS tuple_size<const volatile _Tp> : public tuple_size<_Tp> {}; 5606c3fb27SDimitry Andric #endif 5706c3fb27SDimitry Andric 5806c3fb27SDimitry Andric #ifndef _LIBCPP_CXX03_LANG 5906c3fb27SDimitry Andric 6006c3fb27SDimitry Andric template <class... _Tp> 61cb14a3feSDimitry Andric struct _LIBCPP_TEMPLATE_VIS tuple_size<tuple<_Tp...> > : public integral_constant<size_t, sizeof...(_Tp)> {}; 6206c3fb27SDimitry Andric 6306c3fb27SDimitry Andric template <class... _Tp> 64cb14a3feSDimitry Andric struct _LIBCPP_TEMPLATE_VIS tuple_size<__tuple_types<_Tp...> > : public integral_constant<size_t, sizeof...(_Tp)> {}; 65*0fca6ea1SDimitry Andric 66*0fca6ea1SDimitry Andric # if _LIBCPP_STD_VER >= 17 67*0fca6ea1SDimitry Andric template <class _Tp> 68*0fca6ea1SDimitry Andric inline constexpr size_t tuple_size_v = tuple_size<_Tp>::value; 69*0fca6ea1SDimitry Andric # endif 7006c3fb27SDimitry Andric 7106c3fb27SDimitry Andric #endif // _LIBCPP_CXX03_LANG 7206c3fb27SDimitry Andric 7306c3fb27SDimitry Andric _LIBCPP_END_NAMESPACE_STD 7406c3fb27SDimitry Andric 7506c3fb27SDimitry Andric #endif // _LIBCPP___TUPLE_TUPLE_SIZE_H 76