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