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/iterator.h> 15 #include <__iterator/iterator_traits.h> 16 #include <__memory/addressof.h> 17 #include <iosfwd> // for forward declarations of char_traits and basic_istream 18 19 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 20 #pragma GCC system_header 21 #endif 22 23 _LIBCPP_PUSH_MACROS 24 #include <__undef_macros> 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_INLINE_VISIBILITY _LIBCPP_CONSTEXPR istream_iterator() : __in_stream_(nullptr), __value_() {} 51 _LIBCPP_INLINE_VISIBILITY istream_iterator(istream_type& __s) : __in_stream_(_VSTD::addressof(__s)) 52 { 53 if (!(*__in_stream_ >> __value_)) 54 __in_stream_ = nullptr; 55 } 56 57 _LIBCPP_INLINE_VISIBILITY const _Tp& operator*() const {return __value_;} 58 _LIBCPP_INLINE_VISIBILITY const _Tp* operator->() const {return _VSTD::addressof((operator*()));} 59 _LIBCPP_INLINE_VISIBILITY istream_iterator& operator++() 60 { 61 if (!(*__in_stream_ >> __value_)) 62 __in_stream_ = nullptr; 63 return *this; 64 } 65 _LIBCPP_INLINE_VISIBILITY istream_iterator operator++(int) 66 {istream_iterator __t(*this); ++(*this); return __t;} 67 68 template <class _Up, class _CharU, class _TraitsU, class _DistanceU> 69 friend _LIBCPP_INLINE_VISIBILITY 70 bool 71 operator==(const istream_iterator<_Up, _CharU, _TraitsU, _DistanceU>& __x, 72 const istream_iterator<_Up, _CharU, _TraitsU, _DistanceU>& __y); 73 74 template <class _Up, class _CharU, class _TraitsU, class _DistanceU> 75 friend _LIBCPP_INLINE_VISIBILITY 76 bool 77 operator==(const istream_iterator<_Up, _CharU, _TraitsU, _DistanceU>& __x, 78 const istream_iterator<_Up, _CharU, _TraitsU, _DistanceU>& __y); 79 }; 80 81 template <class _Tp, class _CharT, class _Traits, class _Distance> 82 inline _LIBCPP_INLINE_VISIBILITY 83 bool 84 operator==(const istream_iterator<_Tp, _CharT, _Traits, _Distance>& __x, 85 const istream_iterator<_Tp, _CharT, _Traits, _Distance>& __y) 86 { 87 return __x.__in_stream_ == __y.__in_stream_; 88 } 89 90 template <class _Tp, class _CharT, class _Traits, class _Distance> 91 inline _LIBCPP_INLINE_VISIBILITY 92 bool 93 operator!=(const istream_iterator<_Tp, _CharT, _Traits, _Distance>& __x, 94 const istream_iterator<_Tp, _CharT, _Traits, _Distance>& __y) 95 { 96 return !(__x == __y); 97 } 98 99 _LIBCPP_END_NAMESPACE_STD 100 101 _LIBCPP_POP_MACROS 102 103 #endif // _LIBCPP___ITERATOR_ISTREAM_ITERATOR_H 104