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46 lines
1.2 KiB
C++
46 lines
1.2 KiB
C++
// -*- C++ -*-
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//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP___ITERATOR_EMPTY_H
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#define _LIBCPP___ITERATOR_EMPTY_H
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#include <__config>
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#include <cstddef>
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#include <initializer_list>
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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# pragma GCC system_header
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#endif
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_LIBCPP_BEGIN_NAMESPACE_STD
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#if _LIBCPP_STD_VER >= 17
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template <class _Cont>
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[[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr auto
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empty(const _Cont& __c) noexcept(noexcept(__c.empty())) -> decltype(__c.empty()) {
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return __c.empty();
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}
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template <class _Tp, size_t _Sz>
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[[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr bool empty(const _Tp (&)[_Sz]) noexcept {
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return false;
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}
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template <class _Ep>
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[[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr bool empty(initializer_list<_Ep> __il) noexcept {
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return __il.size() == 0;
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}
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#endif // _LIBCPP_STD_VER >= 17
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___ITERATOR_EMPTY_H
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