104 lines · c
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-exception7//8//===----------------------------------------------------------------------===//9 10#ifndef _LIBCPP___ITERATOR_ISTREAM_ITERATOR_H11#define _LIBCPP___ITERATOR_ISTREAM_ITERATOR_H12 13#include <__config>14#include <__cstddef/ptrdiff_t.h>15#include <__fwd/istream.h>16#include <__fwd/string.h>17#include <__iterator/default_sentinel.h>18#include <__iterator/iterator.h>19#include <__iterator/iterator_traits.h>20#include <__memory/addressof.h>21 22#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)23# pragma GCC system_header24#endif25 26_LIBCPP_BEGIN_NAMESPACE_STD27 28template <class _Tp, class _CharT = char, class _Traits = char_traits<_CharT>, class _Distance = ptrdiff_t>29class istream_iterator30 : public __iterator_base<istream_iterator<_Tp, _CharT, _Traits, _Distance>,31 input_iterator_tag,32 _Tp,33 _Distance,34 const _Tp*,35 const _Tp&> {36public: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 46private:47 istream_type* __in_stream_;48 _Tp __value_;49 50public:51 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR istream_iterator() : __in_stream_(nullptr), __value_() {}52#if _LIBCPP_STD_VER >= 2053 _LIBCPP_HIDE_FROM_ABI constexpr istream_iterator(default_sentinel_t) : istream_iterator() {}54#endif // _LIBCPP_STD_VER >= 2055 _LIBCPP_HIDE_FROM_ABI istream_iterator(istream_type& __s) : __in_stream_(std::addressof(__s)) {56 if (!(*__in_stream_ >> __value_))57 __in_stream_ = nullptr;58 }59 60 // LWG3600 Changed the wording of the copy constructor. In libc++ this constructor61 // can still be trivial after this change.62 63 _LIBCPP_HIDE_FROM_ABI const _Tp& operator*() const { return __value_; }64 _LIBCPP_HIDE_FROM_ABI const _Tp* operator->() const { return std::addressof((operator*())); }65 _LIBCPP_HIDE_FROM_ABI istream_iterator& operator++() {66 if (!(*__in_stream_ >> __value_))67 __in_stream_ = nullptr;68 return *this;69 }70 _LIBCPP_HIDE_FROM_ABI istream_iterator operator++(int) {71 istream_iterator __t(*this);72 ++(*this);73 return __t;74 }75 76 template <class _Up, class _CharU, class _TraitsU, class _DistanceU>77 friend _LIBCPP_HIDE_FROM_ABI bool operator==(const istream_iterator<_Up, _CharU, _TraitsU, _DistanceU>& __x,78 const istream_iterator<_Up, _CharU, _TraitsU, _DistanceU>& __y);79 80#if _LIBCPP_STD_VER >= 2081 friend _LIBCPP_HIDE_FROM_ABI bool operator==(const istream_iterator& __i, default_sentinel_t) {82 return __i.__in_stream_ == nullptr;83 }84#endif // _LIBCPP_STD_VER >= 2085};86 87template <class _Tp, class _CharT, class _Traits, class _Distance>88inline _LIBCPP_HIDE_FROM_ABI bool operator==(const istream_iterator<_Tp, _CharT, _Traits, _Distance>& __x,89 const istream_iterator<_Tp, _CharT, _Traits, _Distance>& __y) {90 return __x.__in_stream_ == __y.__in_stream_;91}92 93#if _LIBCPP_STD_VER <= 1794template <class _Tp, class _CharT, class _Traits, class _Distance>95inline _LIBCPP_HIDE_FROM_ABI bool operator!=(const istream_iterator<_Tp, _CharT, _Traits, _Distance>& __x,96 const istream_iterator<_Tp, _CharT, _Traits, _Distance>& __y) {97 return !(__x == __y);98}99#endif // _LIBCPP_STD_VER <= 17100 101_LIBCPP_END_NAMESPACE_STD102 103#endif // _LIBCPP___ITERATOR_ISTREAM_ITERATOR_H104