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_BEGIN_NAMESPACE_STD 24 25 _LIBCPP_SUPPRESS_DEPRECATED_PUSH 26 template <class _Tp, class _CharT = char, 27 class _Traits = char_traits<_CharT>, class _Distance = ptrdiff_t> 28 class _LIBCPP_TEMPLATE_VIS istream_iterator 29 #if _LIBCPP_STD_VER <= 14 || !defined(_LIBCPP_ABI_NO_ITERATOR_BASES) 30 : public iterator<input_iterator_tag, _Tp, _Distance, const _Tp*, const _Tp&> 31 #endif 32 { 33 _LIBCPP_SUPPRESS_DEPRECATED_POP 34 public: 35 typedef input_iterator_tag iterator_category; 36 typedef _Tp value_type; 37 typedef _Distance difference_type; 38 typedef const _Tp* pointer; 39 typedef const _Tp& reference; 40 typedef _CharT char_type; 41 typedef _Traits traits_type; 42 typedef basic_istream<_CharT,_Traits> istream_type; 43 private: 44 istream_type* __in_stream_; 45 _Tp __value_; 46 public: 47 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR istream_iterator() : __in_stream_(nullptr), __value_() {} 48 _LIBCPP_INLINE_VISIBILITY istream_iterator(istream_type& __s) : __in_stream_(_VSTD::addressof(__s)) 49 { 50 if (!(*__in_stream_ >> __value_)) 51 __in_stream_ = nullptr; 52 } 53 54 _LIBCPP_INLINE_VISIBILITY const _Tp& operator*() const {return __value_;} 55 _LIBCPP_INLINE_VISIBILITY const _Tp* operator->() const {return _VSTD::addressof((operator*()));} 56 _LIBCPP_INLINE_VISIBILITY istream_iterator& operator++() 57 { 58 if (!(*__in_stream_ >> __value_)) 59 __in_stream_ = nullptr; 60 return *this; 61 } 62 _LIBCPP_INLINE_VISIBILITY istream_iterator operator++(int) 63 {istream_iterator __t(*this); ++(*this); return __t;} 64 65 template <class _Up, class _CharU, class _TraitsU, class _DistanceU> 66 friend _LIBCPP_INLINE_VISIBILITY 67 bool 68 operator==(const istream_iterator<_Up, _CharU, _TraitsU, _DistanceU>& __x, 69 const istream_iterator<_Up, _CharU, _TraitsU, _DistanceU>& __y); 70 }; 71 72 template <class _Tp, class _CharT, class _Traits, class _Distance> 73 inline _LIBCPP_INLINE_VISIBILITY 74 bool 75 operator==(const istream_iterator<_Tp, _CharT, _Traits, _Distance>& __x, 76 const istream_iterator<_Tp, _CharT, _Traits, _Distance>& __y) 77 { 78 return __x.__in_stream_ == __y.__in_stream_; 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 == __y); 88 } 89 90 _LIBCPP_END_NAMESPACE_STD 91 92 #endif // _LIBCPP___ITERATOR_ISTREAM_ITERATOR_H 93