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// -*- 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 <__iterator/iterator.h>
#include <__iterator/iterator_traits.h>
#include <iosfwd> // for forward declaration of basic_streambuf
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
#pragma GCC system_header
#endif
_LIBCPP_PUSH_MACROS
#include <__undef_macros>
_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_INLINE_VISIBILITY __proxy(char_type __c, streambuf_type* __s)
: __keep_(__c), __sbuf_(__s) {}
friend class istreambuf_iterator;
public:
_LIBCPP_INLINE_VISIBILITY char_type operator*() const {return __keep_;}
};
_LIBCPP_INLINE_VISIBILITY
bool __test_for_eof() const
{
if (__sbuf_ && traits_type::eq_int_type(__sbuf_->sgetc(), traits_type::eof()))
__sbuf_ = nullptr;
return __sbuf_ == nullptr;
}
public:
_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR istreambuf_iterator() _NOEXCEPT : __sbuf_(nullptr) {}
_LIBCPP_INLINE_VISIBILITY istreambuf_iterator(istream_type& __s) _NOEXCEPT
: __sbuf_(__s.rdbuf()) {}
_LIBCPP_INLINE_VISIBILITY istreambuf_iterator(streambuf_type* __s) _NOEXCEPT
: __sbuf_(__s) {}
_LIBCPP_INLINE_VISIBILITY istreambuf_iterator(const __proxy& __p) _NOEXCEPT
: __sbuf_(__p.__sbuf_) {}
_LIBCPP_INLINE_VISIBILITY char_type operator*() const
{return static_cast<char_type>(__sbuf_->sgetc());}
_LIBCPP_INLINE_VISIBILITY istreambuf_iterator& operator++()
{
__sbuf_->sbumpc();
return *this;
}
_LIBCPP_INLINE_VISIBILITY __proxy operator++(int)
{
return __proxy(__sbuf_->sbumpc(), __sbuf_);
}
_LIBCPP_INLINE_VISIBILITY bool equal(const istreambuf_iterator& __b) const
{return __test_for_eof() == __b.__test_for_eof();}
};
template <class _CharT, class _Traits>
inline _LIBCPP_INLINE_VISIBILITY
bool operator==(const istreambuf_iterator<_CharT,_Traits>& __a,
const istreambuf_iterator<_CharT,_Traits>& __b)
{return __a.equal(__b);}
template <class _CharT, class _Traits>
inline _LIBCPP_INLINE_VISIBILITY
bool operator!=(const istreambuf_iterator<_CharT,_Traits>& __a,
const istreambuf_iterator<_CharT,_Traits>& __b)
{return !__a.equal(__b);}
_LIBCPP_END_NAMESPACE_STD
_LIBCPP_POP_MACROS
#endif // _LIBCPP___ITERATOR_ISTREAMBUF_ITERATOR_H
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