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_ISTREAM_ITERATOR_H 11 #define _LIBCPP___ITERATOR_ISTREAM_ITERATOR_H 12 13 #include <__config> 14 #include <__iterator/default_sentinel.h> 15 #include <__iterator/iterator.h> 16 #include <__iterator/iterator_traits.h> 17 #include <__memory/addressof.h> 18 #include <cstddef> 19 #include <iosfwd> // for forward declarations of char_traits and basic_istream 20 21 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 22 # pragma GCC system_header 23 #endif 24 25 _LIBCPP_BEGIN_NAMESPACE_STD 26 27 _LIBCPP_SUPPRESS_DEPRECATED_PUSH 28 template <class _Tp, class _CharT = char, 29 class _Traits = char_traits<_CharT>, class _Distance = ptrdiff_t> 30 class _LIBCPP_TEMPLATE_VIS istream_iterator 31 #if _LIBCPP_STD_VER <= 14 || !defined(_LIBCPP_ABI_NO_ITERATOR_BASES) 32 : public iterator<input_iterator_tag, _Tp, _Distance, const _Tp*, const _Tp&> 33 #endif 34 { 35 _LIBCPP_SUPPRESS_DEPRECATED_POP 36 public: 37 typedef input_iterator_tag iterator_category; 38 typedef _Tp value_type; 39 typedef _Distance difference_type; 40 typedef const _Tp* pointer; 41 typedef const _Tp& reference; 42 typedef _CharT char_type; 43 typedef _Traits traits_type; 44 typedef basic_istream<_CharT,_Traits> istream_type; 45 private: 46 istream_type* __in_stream_; 47 _Tp __value_; 48 public: 49 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR istream_iterator() : __in_stream_(nullptr), __value_() {} 50 #if _LIBCPP_STD_VER >= 20 51 _LIBCPP_HIDE_FROM_ABI constexpr istream_iterator(default_sentinel_t) : istream_iterator() {} 52 #endif // _LIBCPP_STD_VER >= 20 53 _LIBCPP_INLINE_VISIBILITY istream_iterator(istream_type& __s) : __in_stream_(_VSTD::addressof(__s)) 54 { 55 if (!(*__in_stream_ >> __value_)) 56 __in_stream_ = nullptr; 57 } 58 59 _LIBCPP_INLINE_VISIBILITY const _Tp& operator*() const {return __value_;} 60 _LIBCPP_INLINE_VISIBILITY const _Tp* operator->() const {return _VSTD::addressof((operator*()));} 61 _LIBCPP_INLINE_VISIBILITY istream_iterator& operator++() 62 { 63 if (!(*__in_stream_ >> __value_)) 64 __in_stream_ = nullptr; 65 return *this; 66 } 67 _LIBCPP_INLINE_VISIBILITY istream_iterator operator++(int) 68 {istream_iterator __t(*this); ++(*this); return __t;} 69 70 template <class _Up, class _CharU, class _TraitsU, class _DistanceU> 71 friend _LIBCPP_INLINE_VISIBILITY 72 bool 73 operator==(const istream_iterator<_Up, _CharU, _TraitsU, _DistanceU>& __x, 74 const istream_iterator<_Up, _CharU, _TraitsU, _DistanceU>& __y); 75 76 #if _LIBCPP_STD_VER >= 20 77 friend _LIBCPP_HIDE_FROM_ABI bool operator==(const istream_iterator& __i, default_sentinel_t) { 78 return __i.__in_stream_ == nullptr; 79 } 80 #endif // _LIBCPP_STD_VER >= 20 81 }; 82 83 template <class _Tp, class _CharT, class _Traits, class _Distance> 84 inline _LIBCPP_INLINE_VISIBILITY 85 bool 86 operator==(const istream_iterator<_Tp, _CharT, _Traits, _Distance>& __x, 87 const istream_iterator<_Tp, _CharT, _Traits, _Distance>& __y) 88 { 89 return __x.__in_stream_ == __y.__in_stream_; 90 } 91 92 #if _LIBCPP_STD_VER <= 17 93 template <class _Tp, class _CharT, class _Traits, class _Distance> 94 inline _LIBCPP_INLINE_VISIBILITY 95 bool 96 operator!=(const istream_iterator<_Tp, _CharT, _Traits, _Distance>& __x, 97 const istream_iterator<_Tp, _CharT, _Traits, _Distance>& __y) 98 { 99 return !(__x == __y); 100 } 101 #endif // _LIBCPP_STD_VER <= 17 102 103 _LIBCPP_END_NAMESPACE_STD 104 105 #endif // _LIBCPP___ITERATOR_ISTREAM_ITERATOR_H 106