1 // -*- C++ -*- 2 //===----------------------------------------------------------------------===// 3 // 4 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 5 // See https://llvm.org/LICENSE.txt for license information. 6 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 7 // 8 //===----------------------------------------------------------------------===// 9 10 #ifndef _LIBCPP___ITERATOR_EMPTY_H 11 #define _LIBCPP___ITERATOR_EMPTY_H 12 13 #include <__config> 14 #include <cstddef> 15 #include <initializer_list> 16 17 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 18 #pragma GCC system_header 19 #endif 20 21 _LIBCPP_BEGIN_NAMESPACE_STD 22 23 #if _LIBCPP_STD_VER > 14 24 25 template <class _Cont> 26 _LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_INLINE_VISIBILITY 27 constexpr auto empty(const _Cont& __c) 28 _NOEXCEPT_(noexcept(__c.empty())) 29 -> decltype (__c.empty()) 30 { return __c.empty(); } 31 32 template <class _Tp, size_t _Sz> 33 _LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_INLINE_VISIBILITY 34 constexpr bool empty(const _Tp (&)[_Sz]) noexcept { return false; } 35 36 template <class _Ep> 37 _LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_INLINE_VISIBILITY 38 constexpr bool empty(initializer_list<_Ep> __il) noexcept { return __il.size() == 0; } 39 40 #endif // _LIBCPP_STD_VER > 14 41 42 _LIBCPP_END_NAMESPACE_STD 43 44 #endif // _LIBCPP___ITERATOR_EMPTY_H 45