158551Skris// -*- C++ -*- 258551Skris//===----------------------------------------------------------------------===// 3230237Sbapt// 4230237Sbapt// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 5230237Sbapt// See https://llvm.org/LICENSE.txt for license information. 658551Skris// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 758551Skris// 858551Skris//===----------------------------------------------------------------------===// 958551Skris 1058551Skris#ifndef _LIBCPP___ITERATOR_ISTREAMBUF_ITERATOR_H 11230237Sbapt#define _LIBCPP___ITERATOR_ISTREAMBUF_ITERATOR_H 1258551Skris 1358551Skris#include <__config> 1458551Skris#include <__fwd/istream.h> 1558551Skris#include <__fwd/streambuf.h> 1658551Skris#include <__iterator/default_sentinel.h> 1758551Skris#include <__iterator/iterator.h> 1858551Skris#include <__iterator/iterator_traits.h> 1958551Skris 20230237Sbapt#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 21230237Sbapt# pragma GCC system_header 22230237Sbapt#endif 2358551Skris 2458551Skris_LIBCPP_BEGIN_NAMESPACE_STD 2558551Skris 2658551Skris_LIBCPP_SUPPRESS_DEPRECATED_PUSH 2758551Skristemplate <class _CharT, class _Traits> 2858551Skrisclass _LIBCPP_TEMPLATE_VIS istreambuf_iterator 2958551Skris#if _LIBCPP_STD_VER <= 14 || !defined(_LIBCPP_ABI_NO_ITERATOR_BASES) 3058551Skris : public iterator<input_iterator_tag, _CharT, typename _Traits::off_type, _CharT*, _CharT> 3158551Skris#endif 3258551Skris{ 3358551Skris _LIBCPP_SUPPRESS_DEPRECATED_POP 3458551Skris 3558551Skrispublic: 3658551Skris typedef input_iterator_tag iterator_category; 3758551Skris typedef _CharT value_type; 3858551Skris typedef typename _Traits::off_type difference_type; 3958551Skris typedef _CharT* pointer; 4058551Skris typedef _CharT reference; 4158551Skris typedef _CharT char_type; 4258551Skris typedef _Traits traits_type; 4358551Skris typedef typename _Traits::int_type int_type; 4467064Sobrien typedef basic_streambuf<_CharT, _Traits> streambuf_type; 4567064Sobrien typedef basic_istream<_CharT, _Traits> istream_type; 46230237Sbapt 47230237Sbaptprivate: 4858551Skris mutable streambuf_type* __sbuf_; 4958551Skris 5058551Skris class __proxy { 5158551Skris char_type __keep_; 5258551Skris streambuf_type* __sbuf_; 5358551Skris _LIBCPP_HIDE_FROM_ABI explicit __proxy(char_type __c, streambuf_type* __s) : __keep_(__c), __sbuf_(__s) {} 5458551Skris friend class istreambuf_iterator; 5558551Skris 5658551Skris public: 5758551Skris _LIBCPP_HIDE_FROM_ABI char_type operator*() const { return __keep_; } 5867064Sobrien }; 5958551Skris 6058551Skris _LIBCPP_HIDE_FROM_ABI bool __test_for_eof() const { 6158551Skris if (__sbuf_ && traits_type::eq_int_type(__sbuf_->sgetc(), traits_type::eof())) 6258551Skris __sbuf_ = nullptr; 6358551Skris return __sbuf_ == nullptr; 6458551Skris } 6558551Skris 66230237Sbaptpublic: 67230237Sbapt _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR istreambuf_iterator() _NOEXCEPT : __sbuf_(nullptr) {} 68230237Sbapt#if _LIBCPP_STD_VER >= 20 6958551Skris _LIBCPP_HIDE_FROM_ABI constexpr istreambuf_iterator(default_sentinel_t) noexcept : istreambuf_iterator() {} 7058551Skris#endif // _LIBCPP_STD_VER >= 20 71230237Sbapt _LIBCPP_HIDE_FROM_ABI istreambuf_iterator(istream_type& __s) _NOEXCEPT : __sbuf_(__s.rdbuf()) {} 7258551Skris _LIBCPP_HIDE_FROM_ABI istreambuf_iterator(streambuf_type* __s) _NOEXCEPT : __sbuf_(__s) {} 7358551Skris _LIBCPP_HIDE_FROM_ABI istreambuf_iterator(const __proxy& __p) _NOEXCEPT : __sbuf_(__p.__sbuf_) {} 7458551Skris 7558551Skris _LIBCPP_HIDE_FROM_ABI char_type operator*() const { return static_cast<char_type>(__sbuf_->sgetc()); } 7658551Skris _LIBCPP_HIDE_FROM_ABI istreambuf_iterator& operator++() { 7758551Skris __sbuf_->sbumpc(); 7858551Skris return *this; 7958551Skris } 8058551Skris _LIBCPP_HIDE_FROM_ABI __proxy operator++(int) { return __proxy(__sbuf_->sbumpc(), __sbuf_); } 8158551Skris 8258551Skris _LIBCPP_HIDE_FROM_ABI bool equal(const istreambuf_iterator& __b) const { 8358551Skris return __test_for_eof() == __b.__test_for_eof(); 8458551Skris } 8558551Skris 8658551Skris#if _LIBCPP_STD_VER >= 20 8758551Skris friend _LIBCPP_HIDE_FROM_ABI bool operator==(const istreambuf_iterator& __i, default_sentinel_t) { 8858551Skris return __i.__test_for_eof(); 8958551Skris } 90230237Sbapt#endif // _LIBCPP_STD_VER >= 20 91230237Sbapt}; 92230237Sbapt 93230237Sbapttemplate <class _CharT, class _Traits> 94230237Sbaptinline _LIBCPP_HIDE_FROM_ABI bool 95230237Sbaptoperator==(const istreambuf_iterator<_CharT, _Traits>& __a, const istreambuf_iterator<_CharT, _Traits>& __b) { 96230237Sbapt return __a.equal(__b); 97230237Sbapt} 98230237Sbapt 9958551Skris#if _LIBCPP_STD_VER <= 17 100230237Sbapttemplate <class _CharT, class _Traits> 101230237Sbaptinline _LIBCPP_HIDE_FROM_ABI bool 102230237Sbaptoperator!=(const istreambuf_iterator<_CharT, _Traits>& __a, const istreambuf_iterator<_CharT, _Traits>& __b) { 103230237Sbapt return !__a.equal(__b); 104230237Sbapt} 105230237Sbapt#endif // _LIBCPP_STD_VER <= 17 106230237Sbapt 107230237Sbapt_LIBCPP_END_NAMESPACE_STD 108230237Sbapt 109230237Sbapt#endif // _LIBCPP___ITERATOR_ISTREAMBUF_ITERATOR_H 110230237Sbapt