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_ISTREAMBUF_ITERATOR_H 11 #define _LIBCPP___ITERATOR_ISTREAMBUF_ITERATOR_H 12 13 #include <__config> 14 #include <__fwd/istream.h> 15 #include <__fwd/streambuf.h> 16 #include <__iterator/default_sentinel.h> 17 #include <__iterator/iterator.h> 18 #include <__iterator/iterator_traits.h> 19 20 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 21 # pragma GCC system_header 22 #endif 23 24 _LIBCPP_BEGIN_NAMESPACE_STD 25 26 _LIBCPP_SUPPRESS_DEPRECATED_PUSH 27 template<class _CharT, class _Traits> 28 class _LIBCPP_TEMPLATE_VIS istreambuf_iterator 29 #if _LIBCPP_STD_VER <= 14 || !defined(_LIBCPP_ABI_NO_ITERATOR_BASES) 30 : public iterator<input_iterator_tag, _CharT, 31 typename _Traits::off_type, _CharT*, 32 _CharT> 33 #endif 34 { 35 _LIBCPP_SUPPRESS_DEPRECATED_POP 36 public: 37 typedef input_iterator_tag iterator_category; 38 typedef _CharT value_type; 39 typedef typename _Traits::off_type difference_type; 40 typedef _CharT* pointer; 41 typedef _CharT reference; 42 typedef _CharT char_type; 43 typedef _Traits traits_type; 44 typedef typename _Traits::int_type int_type; 45 typedef basic_streambuf<_CharT,_Traits> streambuf_type; 46 typedef basic_istream<_CharT,_Traits> istream_type; 47 private: 48 mutable streambuf_type* __sbuf_; 49 50 class __proxy 51 { 52 char_type __keep_; 53 streambuf_type* __sbuf_; 54 _LIBCPP_INLINE_VISIBILITY __proxy(char_type __c,streambuf_type * __s)55 explicit __proxy(char_type __c, streambuf_type* __s) 56 : __keep_(__c), __sbuf_(__s) {} 57 friend class istreambuf_iterator; 58 public: 59 _LIBCPP_INLINE_VISIBILITY char_type operator*() const {return __keep_;} 60 }; 61 62 _LIBCPP_INLINE_VISIBILITY __test_for_eof()63 bool __test_for_eof() const 64 { 65 if (__sbuf_ && traits_type::eq_int_type(__sbuf_->sgetc(), traits_type::eof())) 66 __sbuf_ = nullptr; 67 return __sbuf_ == nullptr; 68 } 69 public: istreambuf_iterator()70 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR istreambuf_iterator() _NOEXCEPT : __sbuf_(nullptr) {} 71 #if _LIBCPP_STD_VER >= 20 istreambuf_iterator(default_sentinel_t)72 _LIBCPP_INLINE_VISIBILITY constexpr istreambuf_iterator(default_sentinel_t) noexcept 73 : istreambuf_iterator() {} 74 #endif // _LIBCPP_STD_VER >= 20 istreambuf_iterator(istream_type & __s)75 _LIBCPP_INLINE_VISIBILITY istreambuf_iterator(istream_type& __s) _NOEXCEPT 76 : __sbuf_(__s.rdbuf()) {} istreambuf_iterator(streambuf_type * __s)77 _LIBCPP_INLINE_VISIBILITY istreambuf_iterator(streambuf_type* __s) _NOEXCEPT 78 : __sbuf_(__s) {} istreambuf_iterator(const __proxy & __p)79 _LIBCPP_INLINE_VISIBILITY istreambuf_iterator(const __proxy& __p) _NOEXCEPT 80 : __sbuf_(__p.__sbuf_) {} 81 82 _LIBCPP_INLINE_VISIBILITY char_type operator*() const 83 {return static_cast<char_type>(__sbuf_->sgetc());} 84 _LIBCPP_INLINE_VISIBILITY istreambuf_iterator& operator++() 85 { 86 __sbuf_->sbumpc(); 87 return *this; 88 } 89 _LIBCPP_INLINE_VISIBILITY __proxy operator++(int) 90 { 91 return __proxy(__sbuf_->sbumpc(), __sbuf_); 92 } 93 equal(const istreambuf_iterator & __b)94 _LIBCPP_INLINE_VISIBILITY bool equal(const istreambuf_iterator& __b) const 95 {return __test_for_eof() == __b.__test_for_eof();} 96 97 #if _LIBCPP_STD_VER >= 20 98 friend _LIBCPP_HIDE_FROM_ABI bool operator==(const istreambuf_iterator& __i, default_sentinel_t) { 99 return __i.__test_for_eof(); 100 } 101 #endif // _LIBCPP_STD_VER >= 20 102 }; 103 104 template <class _CharT, class _Traits> 105 inline _LIBCPP_INLINE_VISIBILITY 106 bool operator==(const istreambuf_iterator<_CharT,_Traits>& __a, 107 const istreambuf_iterator<_CharT,_Traits>& __b) 108 {return __a.equal(__b);} 109 110 #if _LIBCPP_STD_VER <= 17 111 template <class _CharT, class _Traits> 112 inline _LIBCPP_INLINE_VISIBILITY 113 bool operator!=(const istreambuf_iterator<_CharT,_Traits>& __a, 114 const istreambuf_iterator<_CharT,_Traits>& __b) 115 {return !__a.equal(__b);} 116 #endif // _LIBCPP_STD_VER <= 17 117 118 _LIBCPP_END_NAMESPACE_STD 119 120 #endif // _LIBCPP___ITERATOR_ISTREAMBUF_ITERATOR_H 121