368faacac7
This commit reverts 5aaefa51 (and also partly 7f285f48e77 and b6d75682f9, which were related to the original commit). As landed, 5aaefa51 had unintended consequences on some downstream bots and didn't have proper coverage upstream due to a few subtle things. Implementing this is something we should do in libc++, however we'll first need to address a few issues listed in https://reviews.llvm.org/D106124#3349710. Differential Revision: https://reviews.llvm.org/D120683
105 lines
3.7 KiB
C++
105 lines
3.7 KiB
C++
// -*- C++ -*-
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//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP___ITERATOR_ISTREAM_ITERATOR_H
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#define _LIBCPP___ITERATOR_ISTREAM_ITERATOR_H
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#include <__config>
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#include <__iterator/default_sentinel.h>
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#include <__iterator/iterator.h>
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#include <__iterator/iterator_traits.h>
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#include <__memory/addressof.h>
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#include <iosfwd> // for forward declarations of char_traits and basic_istream
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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# pragma GCC system_header
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#endif
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_LIBCPP_BEGIN_NAMESPACE_STD
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_LIBCPP_SUPPRESS_DEPRECATED_PUSH
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template <class _Tp, class _CharT = char,
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class _Traits = char_traits<_CharT>, class _Distance = ptrdiff_t>
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class _LIBCPP_TEMPLATE_VIS istream_iterator
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#if _LIBCPP_STD_VER <= 14 || !defined(_LIBCPP_ABI_NO_ITERATOR_BASES)
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: public iterator<input_iterator_tag, _Tp, _Distance, const _Tp*, const _Tp&>
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#endif
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{
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_LIBCPP_SUPPRESS_DEPRECATED_POP
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public:
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typedef input_iterator_tag iterator_category;
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typedef _Tp value_type;
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typedef _Distance difference_type;
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typedef const _Tp* pointer;
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typedef const _Tp& reference;
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typedef _CharT char_type;
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typedef _Traits traits_type;
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typedef basic_istream<_CharT,_Traits> istream_type;
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private:
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istream_type* __in_stream_;
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_Tp __value_;
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public:
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_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR istream_iterator() : __in_stream_(nullptr), __value_() {}
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#if _LIBCPP_STD_VER > 17
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_LIBCPP_HIDE_FROM_ABI constexpr istream_iterator(default_sentinel_t) : istream_iterator() {}
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#endif // _LIBCPP_STD_VER > 17
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_LIBCPP_INLINE_VISIBILITY istream_iterator(istream_type& __s) : __in_stream_(_VSTD::addressof(__s))
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{
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if (!(*__in_stream_ >> __value_))
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__in_stream_ = nullptr;
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}
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_LIBCPP_INLINE_VISIBILITY const _Tp& operator*() const {return __value_;}
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_LIBCPP_INLINE_VISIBILITY const _Tp* operator->() const {return _VSTD::addressof((operator*()));}
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_LIBCPP_INLINE_VISIBILITY istream_iterator& operator++()
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{
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if (!(*__in_stream_ >> __value_))
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__in_stream_ = nullptr;
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return *this;
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}
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_LIBCPP_INLINE_VISIBILITY istream_iterator operator++(int)
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{istream_iterator __t(*this); ++(*this); return __t;}
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template <class _Up, class _CharU, class _TraitsU, class _DistanceU>
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friend _LIBCPP_INLINE_VISIBILITY
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bool
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operator==(const istream_iterator<_Up, _CharU, _TraitsU, _DistanceU>& __x,
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const istream_iterator<_Up, _CharU, _TraitsU, _DistanceU>& __y);
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#if _LIBCPP_STD_VER > 17
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friend _LIBCPP_HIDE_FROM_ABI bool operator==(const istream_iterator& __i, default_sentinel_t) {
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return __i.__in_stream_ == nullptr;
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}
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#endif // _LIBCPP_STD_VER > 17
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};
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template <class _Tp, class _CharT, class _Traits, class _Distance>
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inline _LIBCPP_INLINE_VISIBILITY
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bool
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operator==(const istream_iterator<_Tp, _CharT, _Traits, _Distance>& __x,
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const istream_iterator<_Tp, _CharT, _Traits, _Distance>& __y)
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{
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return __x.__in_stream_ == __y.__in_stream_;
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}
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#if _LIBCPP_STD_VER <= 17
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template <class _Tp, class _CharT, class _Traits, class _Distance>
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inline _LIBCPP_INLINE_VISIBILITY
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bool
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operator!=(const istream_iterator<_Tp, _CharT, _Traits, _Distance>& __x,
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const istream_iterator<_Tp, _CharT, _Traits, _Distance>& __y)
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{
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return !(__x == __y);
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}
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#endif // _LIBCPP_STD_VER <= 17
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___ITERATOR_ISTREAM_ITERATOR_H
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