diff options
Diffstat (limited to 'contrib/llvm-project/libcxx/include/__iterator/empty.h')
-rw-r--r-- | contrib/llvm-project/libcxx/include/__iterator/empty.h | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/contrib/llvm-project/libcxx/include/__iterator/empty.h b/contrib/llvm-project/libcxx/include/__iterator/empty.h new file mode 100644 index 000000000000..4dd59f5cccbd --- /dev/null +++ b/contrib/llvm-project/libcxx/include/__iterator/empty.h @@ -0,0 +1,49 @@ +// -*- C++ -*- +//===----------------------------------------------------------------------===// +// +// 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___ITERATOR_EMPTY_H +#define _LIBCPP___ITERATOR_EMPTY_H + +#include <__config> +#include <cstddef> +#include <initializer_list> + +#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) +#pragma GCC system_header +#endif + +_LIBCPP_PUSH_MACROS +#include <__undef_macros> + +_LIBCPP_BEGIN_NAMESPACE_STD + +#if _LIBCPP_STD_VER > 14 + +template <class _Cont> +_LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_INLINE_VISIBILITY +constexpr auto empty(const _Cont& __c) +_NOEXCEPT_(noexcept(__c.empty())) +-> decltype (__c.empty()) +{ return __c.empty(); } + +template <class _Tp, size_t _Sz> +_LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_INLINE_VISIBILITY +constexpr bool empty(const _Tp (&)[_Sz]) noexcept { return false; } + +template <class _Ep> +_LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_INLINE_VISIBILITY +constexpr bool empty(initializer_list<_Ep> __il) noexcept { return __il.size() == 0; } + +#endif // _LIBCPP_STD_VER > 14 + +_LIBCPP_END_NAMESPACE_STD + +_LIBCPP_POP_MACROS + +#endif // _LIBCPP___ITERATOR_EMPTY_H |