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 #include <__string/char_traits.h> 20 #include <iosfwd> 21 22 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 23 # pragma GCC system_header 24 #endif 25 26 _LIBCPP_BEGIN_NAMESPACE_STD 27 28 _LIBCPP_SUPPRESS_DEPRECATED_PUSH 29 template <class _CharT, class _Traits> 30 class _LIBCPP_TEMPLATE_VIS istreambuf_iterator 31 #if _LIBCPP_STD_VER <= 14 || !defined(_LIBCPP_ABI_NO_ITERATOR_BASES) 32 : public iterator<input_iterator_tag, _CharT, typename _Traits::off_type, _CharT*, _CharT> 33 #endif 34 { 35 _LIBCPP_SUPPRESS_DEPRECATED_POP 36 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 49 private: 50 mutable streambuf_type* __sbuf_; 51 52 class __proxy { 53 char_type __keep_; 54 streambuf_type* __sbuf_; 55 _LIBCPP_HIDE_FROM_ABI explicit __proxy(char_type __c, streambuf_type* __s) : __keep_(__c), __sbuf_(__s) {} 56 friend class istreambuf_iterator; 57 58 public: 59 _LIBCPP_HIDE_FROM_ABI char_type operator*() const { return __keep_; } 60 }; 61 62 _LIBCPP_HIDE_FROM_ABI bool __test_for_eof() const { 63 if (__sbuf_ && traits_type::eq_int_type(__sbuf_->sgetc(), traits_type::eof())) 64 __sbuf_ = nullptr; 65 return __sbuf_ == nullptr; 66 } 67 68 public: 69 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR istreambuf_iterator() _NOEXCEPT : __sbuf_(nullptr) {} 70 #if _LIBCPP_STD_VER >= 20 71 _LIBCPP_HIDE_FROM_ABI constexpr istreambuf_iterator(default_sentinel_t) noexcept : istreambuf_iterator() {} 72 #endif // _LIBCPP_STD_VER >= 20 73 _LIBCPP_HIDE_FROM_ABI istreambuf_iterator(istream_type& __s) _NOEXCEPT : __sbuf_(__s.rdbuf()) {} 74 _LIBCPP_HIDE_FROM_ABI istreambuf_iterator(streambuf_type* __s) _NOEXCEPT : __sbuf_(__s) {} 75 _LIBCPP_HIDE_FROM_ABI istreambuf_iterator(const __proxy& __p) _NOEXCEPT : __sbuf_(__p.__sbuf_) {} 76 77 _LIBCPP_HIDE_FROM_ABI char_type operator*() const { return static_cast<char_type>(__sbuf_->sgetc()); } 78 _LIBCPP_HIDE_FROM_ABI istreambuf_iterator& operator++() { 79 __sbuf_->sbumpc(); 80 return *this; 81 } 82 _LIBCPP_HIDE_FROM_ABI __proxy operator++(int) { return __proxy(__sbuf_->sbumpc(), __sbuf_); } 83 84 _LIBCPP_HIDE_FROM_ABI bool equal(const istreambuf_iterator& __b) const { 85 return __test_for_eof() == __b.__test_for_eof(); 86 } 87 88 #if _LIBCPP_STD_VER >= 20 89 friend _LIBCPP_HIDE_FROM_ABI bool operator==(const istreambuf_iterator& __i, default_sentinel_t) { 90 return __i.__test_for_eof(); 91 } 92 #endif // _LIBCPP_STD_VER >= 20 93 }; 94 95 template <class _CharT, class _Traits> 96 inline _LIBCPP_HIDE_FROM_ABI bool 97 operator==(const istreambuf_iterator<_CharT, _Traits>& __a, const istreambuf_iterator<_CharT, _Traits>& __b) { 98 return __a.equal(__b); 99 } 100 101 #if _LIBCPP_STD_VER <= 17 102 template <class _CharT, class _Traits> 103 inline _LIBCPP_HIDE_FROM_ABI bool 104 operator!=(const istreambuf_iterator<_CharT, _Traits>& __a, const istreambuf_iterator<_CharT, _Traits>& __b) { 105 return !__a.equal(__b); 106 } 107 #endif // _LIBCPP_STD_VER <= 17 108 109 _LIBCPP_END_NAMESPACE_STD 110 111 #endif // _LIBCPP___ITERATOR_ISTREAMBUF_ITERATOR_H 112