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_PUSH_MACROS 23 #include <__undef_macros> 24 25 _LIBCPP_BEGIN_NAMESPACE_STD 26 27 _LIBCPP_SUPPRESS_DEPRECATED_PUSH 28 template<class _CharT, class _Traits> 29 class _LIBCPP_TEMPLATE_VIS istreambuf_iterator 30 #if _LIBCPP_STD_VER <= 14 || !defined(_LIBCPP_ABI_NO_ITERATOR_BASES) 31 : public iterator<input_iterator_tag, _CharT, 32 typename _Traits::off_type, _CharT*, 33 _CharT> 34 #endif 35 { 36 _LIBCPP_SUPPRESS_DEPRECATED_POP 37 public: 38 typedef input_iterator_tag iterator_category; 39 typedef _CharT value_type; 40 typedef typename _Traits::off_type difference_type; 41 typedef _CharT* pointer; 42 typedef _CharT reference; 43 typedef _CharT char_type; 44 typedef _Traits traits_type; 45 typedef typename _Traits::int_type int_type; 46 typedef basic_streambuf<_CharT,_Traits> streambuf_type; 47 typedef basic_istream<_CharT,_Traits> istream_type; 48 private: 49 mutable streambuf_type* __sbuf_; 50 51 class __proxy 52 { 53 char_type __keep_; 54 streambuf_type* __sbuf_; 55 _LIBCPP_INLINE_VISIBILITY __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 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: 70 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR istreambuf_iterator() _NOEXCEPT : __sbuf_(nullptr) {} 71 _LIBCPP_INLINE_VISIBILITY istreambuf_iterator(istream_type& __s) _NOEXCEPT 72 : __sbuf_(__s.rdbuf()) {} 73 _LIBCPP_INLINE_VISIBILITY istreambuf_iterator(streambuf_type* __s) _NOEXCEPT 74 : __sbuf_(__s) {} 75 _LIBCPP_INLINE_VISIBILITY istreambuf_iterator(const __proxy& __p) _NOEXCEPT 76 : __sbuf_(__p.__sbuf_) {} 77 78 _LIBCPP_INLINE_VISIBILITY char_type operator*() const 79 {return static_cast<char_type>(__sbuf_->sgetc());} 80 _LIBCPP_INLINE_VISIBILITY istreambuf_iterator& operator++() 81 { 82 __sbuf_->sbumpc(); 83 return *this; 84 } 85 _LIBCPP_INLINE_VISIBILITY __proxy operator++(int) 86 { 87 return __proxy(__sbuf_->sbumpc(), __sbuf_); 88 } 89 90 _LIBCPP_INLINE_VISIBILITY bool equal(const istreambuf_iterator& __b) const 91 {return __test_for_eof() == __b.__test_for_eof();} 92 }; 93 94 template <class _CharT, class _Traits> 95 inline _LIBCPP_INLINE_VISIBILITY 96 bool operator==(const istreambuf_iterator<_CharT,_Traits>& __a, 97 const istreambuf_iterator<_CharT,_Traits>& __b) 98 {return __a.equal(__b);} 99 100 template <class _CharT, class _Traits> 101 inline _LIBCPP_INLINE_VISIBILITY 102 bool operator!=(const istreambuf_iterator<_CharT,_Traits>& __a, 103 const istreambuf_iterator<_CharT,_Traits>& __b) 104 {return !__a.equal(__b);} 105 106 _LIBCPP_END_NAMESPACE_STD 107 108 _LIBCPP_POP_MACROS 109 110 #endif // _LIBCPP___ITERATOR_ISTREAMBUF_ITERATOR_H 111