| //===----------------------------------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef _LIBCPP___TUPLE_TUPLE_SIZE_H |
| #define _LIBCPP___TUPLE_TUPLE_SIZE_H |
| |
| #include <__config> |
| #include <__fwd/tuple.h> |
| #include <__tuple/tuple_types.h> |
| #include <__type_traits/is_const.h> |
| #include <__type_traits/is_volatile.h> |
| #include <cstddef> |
| |
| #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| # pragma GCC system_header |
| #endif |
| |
| _LIBCPP_BEGIN_NAMESPACE_STD |
| |
| template <class _Tp> struct _LIBCPP_TEMPLATE_VIS tuple_size; |
| |
| #if !defined(_LIBCPP_CXX03_LANG) |
| template <class _Tp, class...> |
| using __enable_if_tuple_size_imp = _Tp; |
| |
| template <class _Tp> |
| struct _LIBCPP_TEMPLATE_VIS tuple_size<__enable_if_tuple_size_imp< |
| const _Tp, |
| __enable_if_t<!is_volatile<_Tp>::value>, |
| integral_constant<size_t, sizeof(tuple_size<_Tp>)>>> |
| : public integral_constant<size_t, tuple_size<_Tp>::value> {}; |
| |
| template <class _Tp> |
| struct _LIBCPP_TEMPLATE_VIS tuple_size<__enable_if_tuple_size_imp< |
| volatile _Tp, |
| __enable_if_t<!is_const<_Tp>::value>, |
| integral_constant<size_t, sizeof(tuple_size<_Tp>)>>> |
| : public integral_constant<size_t, tuple_size<_Tp>::value> {}; |
| |
| template <class _Tp> |
| struct _LIBCPP_TEMPLATE_VIS tuple_size<__enable_if_tuple_size_imp< |
| const volatile _Tp, |
| integral_constant<size_t, sizeof(tuple_size<_Tp>)>>> |
| : public integral_constant<size_t, tuple_size<_Tp>::value> {}; |
| |
| #else |
| template <class _Tp> struct _LIBCPP_TEMPLATE_VIS tuple_size<const _Tp> : public tuple_size<_Tp> {}; |
| template <class _Tp> struct _LIBCPP_TEMPLATE_VIS tuple_size<volatile _Tp> : public tuple_size<_Tp> {}; |
| template <class _Tp> struct _LIBCPP_TEMPLATE_VIS tuple_size<const volatile _Tp> : public tuple_size<_Tp> {}; |
| #endif |
| |
| #ifndef _LIBCPP_CXX03_LANG |
| |
| template <class ..._Tp> |
| struct _LIBCPP_TEMPLATE_VIS tuple_size<tuple<_Tp...> > |
| : public integral_constant<size_t, sizeof...(_Tp)> |
| { |
| }; |
| |
| template <class ..._Tp> |
| struct _LIBCPP_TEMPLATE_VIS tuple_size<__tuple_types<_Tp...> > |
| : public integral_constant<size_t, sizeof...(_Tp)> |
| { |
| }; |
| |
| #endif // _LIBCPP_CXX03_LANG |
| |
| _LIBCPP_END_NAMESPACE_STD |
| |
| #endif // _LIBCPP___TUPLE_TUPLE_SIZE_H |