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 <__fwd/istream.h> 15 #include <__fwd/string.h> 16 #include <__iterator/default_sentinel.h> 17 #include <__iterator/iterator.h> 18 #include <__iterator/iterator_traits.h> 19 #include <__memory/addressof.h> 20 #include <cstddef> 21 22 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 23 # pragma GCC system_header 24 #endif 25 26 _LIBCPP_BEGIN_NAMESPACE_STD 27 28 _LIBCPP_SUPPRESS_DEPRECATED_PUSH 29 template <class _Tp, class _CharT = char, 30 class _Traits = char_traits<_CharT>, class _Distance = ptrdiff_t> 31 class _LIBCPP_TEMPLATE_VIS istream_iterator 32 #if _LIBCPP_STD_VER <= 14 || !defined(_LIBCPP_ABI_NO_ITERATOR_BASES) 33 : public iterator<input_iterator_tag, _Tp, _Distance, const _Tp*, const _Tp&> 34 #endif 35 { 36 _LIBCPP_SUPPRESS_DEPRECATED_POP 37 public: 38 typedef input_iterator_tag iterator_category; 39 typedef _Tp value_type; 40 typedef _Distance difference_type; 41 typedef const _Tp* pointer; 42 typedef const _Tp& reference; 43 typedef _CharT char_type; 44 typedef _Traits traits_type; 45 typedef basic_istream<_CharT,_Traits> istream_type; 46 private: 47 istream_type* __in_stream_; 48 _Tp __value_; 49 public: 50 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR istream_iterator() : __in_stream_(nullptr), __value_() {} 51 #if _LIBCPP_STD_VER >= 20 52 _LIBCPP_HIDE_FROM_ABI constexpr istream_iterator(default_sentinel_t) : istream_iterator() {} 53 #endif // _LIBCPP_STD_VER >= 20 54 _LIBCPP_HIDE_FROM_ABI istream_iterator(istream_type& __s) : __in_stream_(std::addressof(__s)) 55 { 56 if (!(*__in_stream_ >> __value_)) 57 __in_stream_ = nullptr; 58 } 59 60 _LIBCPP_HIDE_FROM_ABI const _Tp& operator*() const {return __value_;} 61 _LIBCPP_HIDE_FROM_ABI const _Tp* operator->() const {return std::addressof((operator*()));} 62 _LIBCPP_HIDE_FROM_ABI istream_iterator& operator++() 63 { 64 if (!(*__in_stream_ >> __value_)) 65 __in_stream_ = nullptr; 66 return *this; 67 } 68 _LIBCPP_HIDE_FROM_ABI istream_iterator operator++(int) 69 {istream_iterator __t(*this); ++(*this); return __t;} 70 71 template <class _Up, class _CharU, class _TraitsU, class _DistanceU> 72 friend _LIBCPP_HIDE_FROM_ABI 73 bool 74 operator==(const istream_iterator<_Up, _CharU, _TraitsU, _DistanceU>& __x, 75 const istream_iterator<_Up, _CharU, _TraitsU, _DistanceU>& __y); 76 77 #if _LIBCPP_STD_VER >= 20 78 friend _LIBCPP_HIDE_FROM_ABI bool operator==(const istream_iterator& __i, default_sentinel_t) { 79 return __i.__in_stream_ == nullptr; 80 } 81 #endif // _LIBCPP_STD_VER >= 20 82 }; 83 84 template <class _Tp, class _CharT, class _Traits, class _Distance> 85 inline _LIBCPP_HIDE_FROM_ABI 86 bool 87 operator==(const istream_iterator<_Tp, _CharT, _Traits, _Distance>& __x, 88 const istream_iterator<_Tp, _CharT, _Traits, _Distance>& __y) 89 { 90 return __x.__in_stream_ == __y.__in_stream_; 91 } 92 93 #if _LIBCPP_STD_VER <= 17 94 template <class _Tp, class _CharT, class _Traits, class _Distance> 95 inline _LIBCPP_HIDE_FROM_ABI 96 bool 97 operator!=(const istream_iterator<_Tp, _CharT, _Traits, _Distance>& __x, 98 const istream_iterator<_Tp, _CharT, _Traits, _Distance>& __y) 99 { 100 return !(__x == __y); 101 } 102 #endif // _LIBCPP_STD_VER <= 17 103 104 _LIBCPP_END_NAMESPACE_STD 105 106 #endif // _LIBCPP___ITERATOR_ISTREAM_ITERATOR_H 107