368faacac7
This commit reverts5aaefa51(and also partly7f285f48e7andb6d75682f9, which were related to the original commit). As landed,5aaefa51had 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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