motiejus/zig

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lib/libcxx/include/__iterator/empty.h (1286B) - Raw

      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 >= 17
     24 
     25 template <class _Cont>
     26 _LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_HIDE_FROM_ABI constexpr auto empty(const _Cont& __c)
     27     _NOEXCEPT_(noexcept(__c.empty())) -> decltype(__c.empty()) {
     28   return __c.empty();
     29 }
     30 
     31 template <class _Tp, size_t _Sz>
     32 _LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_HIDE_FROM_ABI constexpr bool empty(const _Tp (&)[_Sz]) noexcept {
     33   return false;
     34 }
     35 
     36 template <class _Ep>
     37 _LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_HIDE_FROM_ABI constexpr bool empty(initializer_list<_Ep> __il) noexcept {
     38   return __il.size() == 0;
     39 }
     40 
     41 #endif // _LIBCPP_STD_VER >= 17
     42 
     43 _LIBCPP_END_NAMESPACE_STD
     44 
     45 #endif // _LIBCPP___ITERATOR_EMPTY_H