| // -*- C++ -*- |
| //===----------------------------------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef _LIBCPP___ITERATOR_ISTREAMBUF_ITERATOR_H |
| #define _LIBCPP___ITERATOR_ISTREAMBUF_ITERATOR_H |
| |
| #include <__config> |
| #include <__fwd/istream.h> |
| #include <__fwd/streambuf.h> |
| #include <__iterator/default_sentinel.h> |
| #include <__iterator/iterator.h> |
| #include <__iterator/iterator_traits.h> |
| |
| #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| # pragma GCC system_header |
| #endif |
| |
| _LIBCPP_BEGIN_NAMESPACE_STD |
| |
| _LIBCPP_SUPPRESS_DEPRECATED_PUSH |
| template <class _CharT, class _Traits> |
| class _LIBCPP_TEMPLATE_VIS istreambuf_iterator |
| #if _LIBCPP_STD_VER <= 14 || !defined(_LIBCPP_ABI_NO_ITERATOR_BASES) |
| : public iterator<input_iterator_tag, _CharT, typename _Traits::off_type, _CharT*, _CharT> |
| #endif |
| { |
| _LIBCPP_SUPPRESS_DEPRECATED_POP |
| |
| public: |
| typedef input_iterator_tag iterator_category; |
| typedef _CharT value_type; |
| typedef typename _Traits::off_type difference_type; |
| typedef _CharT* pointer; |
| typedef _CharT reference; |
| typedef _CharT char_type; |
| typedef _Traits traits_type; |
| typedef typename _Traits::int_type int_type; |
| typedef basic_streambuf<_CharT, _Traits> streambuf_type; |
| typedef basic_istream<_CharT, _Traits> istream_type; |
| |
| private: |
| mutable streambuf_type* __sbuf_; |
| |
| class __proxy { |
| char_type __keep_; |
| streambuf_type* __sbuf_; |
| _LIBCPP_HIDE_FROM_ABI explicit __proxy(char_type __c, streambuf_type* __s) : __keep_(__c), __sbuf_(__s) {} |
| friend class istreambuf_iterator; |
| |
| public: |
| _LIBCPP_HIDE_FROM_ABI char_type operator*() const { return __keep_; } |
| }; |
| |
| _LIBCPP_HIDE_FROM_ABI bool __test_for_eof() const { |
| if (__sbuf_ && traits_type::eq_int_type(__sbuf_->sgetc(), traits_type::eof())) |
| __sbuf_ = nullptr; |
| return __sbuf_ == nullptr; |
| } |
| |
| public: |
| _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR istreambuf_iterator() _NOEXCEPT : __sbuf_(nullptr) {} |
| #if _LIBCPP_STD_VER >= 20 |
| _LIBCPP_HIDE_FROM_ABI constexpr istreambuf_iterator(default_sentinel_t) noexcept : istreambuf_iterator() {} |
| #endif // _LIBCPP_STD_VER >= 20 |
| _LIBCPP_HIDE_FROM_ABI istreambuf_iterator(istream_type& __s) _NOEXCEPT : __sbuf_(__s.rdbuf()) {} |
| _LIBCPP_HIDE_FROM_ABI istreambuf_iterator(streambuf_type* __s) _NOEXCEPT : __sbuf_(__s) {} |
| _LIBCPP_HIDE_FROM_ABI istreambuf_iterator(const __proxy& __p) _NOEXCEPT : __sbuf_(__p.__sbuf_) {} |
| |
| _LIBCPP_HIDE_FROM_ABI char_type operator*() const { return static_cast<char_type>(__sbuf_->sgetc()); } |
| _LIBCPP_HIDE_FROM_ABI istreambuf_iterator& operator++() { |
| __sbuf_->sbumpc(); |
| return *this; |
| } |
| _LIBCPP_HIDE_FROM_ABI __proxy operator++(int) { return __proxy(__sbuf_->sbumpc(), __sbuf_); } |
| |
| _LIBCPP_HIDE_FROM_ABI bool equal(const istreambuf_iterator& __b) const { |
| return __test_for_eof() == __b.__test_for_eof(); |
| } |
| |
| #if _LIBCPP_STD_VER >= 20 |
| friend _LIBCPP_HIDE_FROM_ABI bool operator==(const istreambuf_iterator& __i, default_sentinel_t) { |
| return __i.__test_for_eof(); |
| } |
| #endif // _LIBCPP_STD_VER >= 20 |
| }; |
| |
| template <class _CharT, class _Traits> |
| inline _LIBCPP_HIDE_FROM_ABI bool |
| operator==(const istreambuf_iterator<_CharT, _Traits>& __a, const istreambuf_iterator<_CharT, _Traits>& __b) { |
| return __a.equal(__b); |
| } |
| |
| #if _LIBCPP_STD_VER <= 17 |
| template <class _CharT, class _Traits> |
| inline _LIBCPP_HIDE_FROM_ABI bool |
| operator!=(const istreambuf_iterator<_CharT, _Traits>& __a, const istreambuf_iterator<_CharT, _Traits>& __b) { |
| return !__a.equal(__b); |
| } |
| #endif // _LIBCPP_STD_VER <= 17 |
| |
| _LIBCPP_END_NAMESPACE_STD |
| |
| #endif // _LIBCPP___ITERATOR_ISTREAMBUF_ITERATOR_H |