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| 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 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 |
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