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