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