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112 lines
3.8 KiB
C++
112 lines
3.8 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 <__fwd/istream.h>
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#include <__fwd/streambuf.h>
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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 <__string/char_traits.h>
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#include <iosfwd>
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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 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, typename _Traits::off_type, _CharT*, _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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char_type __keep_;
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streambuf_type* __sbuf_;
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_LIBCPP_HIDE_FROM_ABI explicit __proxy(char_type __c, streambuf_type* __s) : __keep_(__c), __sbuf_(__s) {}
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friend class istreambuf_iterator;
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public:
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_LIBCPP_HIDE_FROM_ABI char_type operator*() const { return __keep_; }
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};
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_LIBCPP_HIDE_FROM_ABI bool __test_for_eof() const {
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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_HIDE_FROM_ABI _LIBCPP_CONSTEXPR istreambuf_iterator() _NOEXCEPT : __sbuf_(nullptr) {}
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#if _LIBCPP_STD_VER >= 20
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_LIBCPP_HIDE_FROM_ABI constexpr istreambuf_iterator(default_sentinel_t) noexcept : istreambuf_iterator() {}
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#endif // _LIBCPP_STD_VER >= 20
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_LIBCPP_HIDE_FROM_ABI istreambuf_iterator(istream_type& __s) _NOEXCEPT : __sbuf_(__s.rdbuf()) {}
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_LIBCPP_HIDE_FROM_ABI istreambuf_iterator(streambuf_type* __s) _NOEXCEPT : __sbuf_(__s) {}
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_LIBCPP_HIDE_FROM_ABI istreambuf_iterator(const __proxy& __p) _NOEXCEPT : __sbuf_(__p.__sbuf_) {}
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_LIBCPP_HIDE_FROM_ABI char_type operator*() const { return static_cast<char_type>(__sbuf_->sgetc()); }
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_LIBCPP_HIDE_FROM_ABI istreambuf_iterator& operator++() {
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__sbuf_->sbumpc();
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return *this;
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}
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_LIBCPP_HIDE_FROM_ABI __proxy operator++(int) { return __proxy(__sbuf_->sbumpc(), __sbuf_); }
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_LIBCPP_HIDE_FROM_ABI bool equal(const istreambuf_iterator& __b) const {
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return __test_for_eof() == __b.__test_for_eof();
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}
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#if _LIBCPP_STD_VER >= 20
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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 >= 20
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};
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template <class _CharT, class _Traits>
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inline _LIBCPP_HIDE_FROM_ABI bool
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operator==(const istreambuf_iterator<_CharT, _Traits>& __a, const istreambuf_iterator<_CharT, _Traits>& __b) {
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return __a.equal(__b);
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}
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#if _LIBCPP_STD_VER <= 17
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template <class _CharT, class _Traits>
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inline _LIBCPP_HIDE_FROM_ABI bool
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operator!=(const istreambuf_iterator<_CharT, _Traits>& __a, const istreambuf_iterator<_CharT, _Traits>& __b) {
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return !__a.equal(__b);
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}
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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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