[thirdparty/gcc.git] / libstdc++-v3 / include / bits / streambuf_iterator.h

// Streambuf iterators

// Copyright (C) 1997-2020 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library.  This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.

// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.

// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
// <http://www.gnu.org/licenses/>.

/** @file bits/streambuf_iterator.h
 *  This is an internal header file, included by other library headers.
 *  Do not attempt to use it directly. @headername{iterator}
 */

#ifndef _STREAMBUF_ITERATOR_H
#define _STREAMBUF_ITERATOR_H 1

#pragma GCC system_header

#include <streambuf>
#include <debug/debug.h>

namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION

  /**
   * @addtogroup iterators
   * @{
   */

  // 24.5.3 Template class istreambuf_iterator
  /// Provides input iterator semantics for streambufs.
  template<typename _CharT, typename _Traits>
    class istreambuf_iterator
    : public iterator<input_iterator_tag, _CharT, typename _Traits::off_type,
		      _CharT*, _CharT>
    {
    public:
      // Types:
      //@{
      /// Public typedefs
#if __cplusplus < 201103L
      typedef _CharT& reference; // Changed to _CharT by LWG 445
#elif __cplusplus > 201703L
      // _GLIBCXX_RESOLVE_LIB_DEFECTS
      // 3188. istreambuf_iterator::pointer should not be unspecified
      using pointer = void;
#endif

      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;
      //@}

      template<typename _CharT2>
	friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value,
				    ostreambuf_iterator<_CharT2> >::__type
	copy(istreambuf_iterator<_CharT2>, istreambuf_iterator<_CharT2>,
	     ostreambuf_iterator<_CharT2>);

      template<bool _IsMove, typename _CharT2>
	friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value,
					       _CharT2*>::__type
	__copy_move_a2(istreambuf_iterator<_CharT2>,
		       istreambuf_iterator<_CharT2>, _CharT2*);

#if __cplusplus >= 201103L
      template<typename _CharT2, typename _Size>
	friend __enable_if_t<__is_char<_CharT2>::__value, _CharT2*>
	__copy_n_a(istreambuf_iterator<_CharT2>, _Size, _CharT2*);
#endif

      template<typename _CharT2>
	friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value,
				    istreambuf_iterator<_CharT2> >::__type
	find(istreambuf_iterator<_CharT2>, istreambuf_iterator<_CharT2>,
	     const _CharT2&);

      template<typename _CharT2, typename _Distance>
	friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value,
					       void>::__type
	advance(istreambuf_iterator<_CharT2>&, _Distance);

    private:
      // 24.5.3 istreambuf_iterator
      // p 1
      // If the end of stream is reached (streambuf_type::sgetc()
      // returns traits_type::eof()), the iterator becomes equal to
      // the "end of stream" iterator value.
      // NB: This implementation assumes the "end of stream" value
      // is EOF, or -1.
      mutable streambuf_type*	_M_sbuf;
      int_type			_M_c;

    public:
      ///  Construct end of input stream iterator.
      _GLIBCXX_CONSTEXPR istreambuf_iterator() _GLIBCXX_USE_NOEXCEPT
      : _M_sbuf(0), _M_c(traits_type::eof()) { }

#if __cplusplus > 201703L && __cpp_lib_concepts
      constexpr istreambuf_iterator(default_sentinel_t) noexcept
      : istreambuf_iterator() { }
#endif

#if __cplusplus >= 201103L
      istreambuf_iterator(const istreambuf_iterator&) noexcept = default;

      ~istreambuf_iterator() = default;
#endif

      ///  Construct start of input stream iterator.
      istreambuf_iterator(istream_type& __s) _GLIBCXX_USE_NOEXCEPT
      : _M_sbuf(__s.rdbuf()), _M_c(traits_type::eof()) { }

      ///  Construct start of streambuf iterator.
      istreambuf_iterator(streambuf_type* __s) _GLIBCXX_USE_NOEXCEPT
      : _M_sbuf(__s), _M_c(traits_type::eof()) { }

#if __cplusplus >= 201103L
      istreambuf_iterator&
      operator=(const istreambuf_iterator&) noexcept = default;
#endif

      ///  Return the current character pointed to by iterator.  This returns
      ///  streambuf.sgetc().  It cannot be assigned.  NB: The result of
      ///  operator*() on an end of stream is undefined.
      char_type
      operator*() const
      {
	int_type __c = _M_get();

#ifdef _GLIBCXX_DEBUG_PEDANTIC
	// Dereferencing a past-the-end istreambuf_iterator is a
	// libstdc++ extension
	__glibcxx_requires_cond(!_S_is_eof(__c),
				_M_message(__gnu_debug::__msg_deref_istreambuf)
				._M_iterator(*this));
#endif
	return traits_type::to_char_type(__c);
      }

      /// Advance the iterator.  Calls streambuf.sbumpc().
      istreambuf_iterator&
      operator++()
      {
	__glibcxx_requires_cond(_M_sbuf &&
				(!_S_is_eof(_M_c) || !_S_is_eof(_M_sbuf->sgetc())),
				_M_message(__gnu_debug::__msg_inc_istreambuf)
				._M_iterator(*this));

	_M_sbuf->sbumpc();
	_M_c = traits_type::eof();
	return *this;
      }

      /// Advance the iterator.  Calls streambuf.sbumpc().
      istreambuf_iterator
      operator++(int)
      {
	__glibcxx_requires_cond(_M_sbuf &&
				(!_S_is_eof(_M_c) || !_S_is_eof(_M_sbuf->sgetc())),
				_M_message(__gnu_debug::__msg_inc_istreambuf)
				._M_iterator(*this));

	istreambuf_iterator __old = *this;
	__old._M_c = _M_sbuf->sbumpc();
	_M_c = traits_type::eof();
	return __old;
      }

      // _GLIBCXX_RESOLVE_LIB_DEFECTS
      // 110 istreambuf_iterator::equal not const
      // NB: there is also number 111 (NAD) relevant to this function.
      /// Return true both iterators are end or both are not end.
      bool
      equal(const istreambuf_iterator& __b) const
      { return _M_at_eof() == __b._M_at_eof(); }

    private:
      int_type
      _M_get() const
      {
	int_type __ret = _M_c;
	if (_M_sbuf && _S_is_eof(__ret) && _S_is_eof(__ret = _M_sbuf->sgetc()))
	  _M_sbuf = 0;
	return __ret;
      }

      bool
      _M_at_eof() const
      { return _S_is_eof(_M_get()); }

      static bool
      _S_is_eof(int_type __c)
      {
	const int_type __eof = traits_type::eof();
	return traits_type::eq_int_type(__c, __eof);
      }

#if __cplusplus > 201703L && __cpp_lib_concepts
      friend bool
      operator==(const istreambuf_iterator& __i, default_sentinel_t __s)
      { return __i._M_at_eof(); }
#endif
    };

  template<typename _CharT, typename _Traits>
    inline bool
    operator==(const istreambuf_iterator<_CharT, _Traits>& __a,
	       const istreambuf_iterator<_CharT, _Traits>& __b)
    { return __a.equal(__b); }

  template<typename _CharT, typename _Traits>
    inline bool
    operator!=(const istreambuf_iterator<_CharT, _Traits>& __a,
	       const istreambuf_iterator<_CharT, _Traits>& __b)
    { return !__a.equal(__b); }

  /// Provides output iterator semantics for streambufs.
  template<typename _CharT, typename _Traits>
    class ostreambuf_iterator
    : public iterator<output_iterator_tag, void, void, void, void>
    {
    public:
      // Types:
      //@{
      /// Public typedefs
#if __cplusplus > 201703L
      using difference_type = ptrdiff_t;
#endif
      typedef _CharT			       char_type;
      typedef _Traits			       traits_type;
      typedef basic_streambuf<_CharT, _Traits> streambuf_type;
      typedef basic_ostream<_CharT, _Traits>   ostream_type;
      //@}

      template<typename _CharT2>
	friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value,
				    ostreambuf_iterator<_CharT2> >::__type
	copy(istreambuf_iterator<_CharT2>, istreambuf_iterator<_CharT2>,
	     ostreambuf_iterator<_CharT2>);

    private:
      streambuf_type*	_M_sbuf;
      bool		_M_failed;

    public:

#if __cplusplus > 201703L
      constexpr
      ostreambuf_iterator() noexcept
      : _M_sbuf(nullptr), _M_failed(true) { }
#endif

      ///  Construct output iterator from ostream.
      ostreambuf_iterator(ostream_type& __s) _GLIBCXX_USE_NOEXCEPT
      : _M_sbuf(__s.rdbuf()), _M_failed(!_M_sbuf) { }

      ///  Construct output iterator from streambuf.
      ostreambuf_iterator(streambuf_type* __s) _GLIBCXX_USE_NOEXCEPT
      : _M_sbuf(__s), _M_failed(!_M_sbuf) { }

      ///  Write character to streambuf.  Calls streambuf.sputc().
      ostreambuf_iterator&
      operator=(_CharT __c)
      {
	if (!_M_failed &&
	    _Traits::eq_int_type(_M_sbuf->sputc(__c), _Traits::eof()))
	  _M_failed = true;
	return *this;
      }

      /// Return *this.
      ostreambuf_iterator&
      operator*()
      { return *this; }

      /// Return *this.
      ostreambuf_iterator&
      operator++(int)
      { return *this; }

      /// Return *this.
      ostreambuf_iterator&
      operator++()
      { return *this; }

      /// Return true if previous operator=() failed.
      bool
      failed() const _GLIBCXX_USE_NOEXCEPT
      { return _M_failed; }

      ostreambuf_iterator&
      _M_put(const _CharT* __ws, streamsize __len)
      {
	if (__builtin_expect(!_M_failed, true)
	    && __builtin_expect(this->_M_sbuf->sputn(__ws, __len) != __len,
				false))
	  _M_failed = true;
	return *this;
      }
    };

  // Overloads for streambuf iterators.
  template<typename _CharT>
    typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value,
				    ostreambuf_iterator<_CharT> >::__type
    copy(istreambuf_iterator<_CharT> __first,
	 istreambuf_iterator<_CharT> __last,
	 ostreambuf_iterator<_CharT> __result)
    {
      if (__first._M_sbuf && !__last._M_sbuf && !__result._M_failed)
	{
	  bool __ineof;
	  __copy_streambufs_eof(__first._M_sbuf, __result._M_sbuf, __ineof);
	  if (!__ineof)
	    __result._M_failed = true;
	}
      return __result;
    }

  template<bool _IsMove, typename _CharT>
    typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value,
				    ostreambuf_iterator<_CharT> >::__type
    __copy_move_a2(_CharT* __first, _CharT* __last,
		   ostreambuf_iterator<_CharT> __result)
    {
      const streamsize __num = __last - __first;
      if (__num > 0)
	__result._M_put(__first, __num);
      return __result;
    }

  template<bool _IsMove, typename _CharT>
    typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value,
				    ostreambuf_iterator<_CharT> >::__type
    __copy_move_a2(const _CharT* __first, const _CharT* __last,
		   ostreambuf_iterator<_CharT> __result)
    {
      const streamsize __num = __last - __first;
      if (__num > 0)
	__result._M_put(__first, __num);
      return __result;
    }

  template<bool _IsMove, typename _CharT>
    typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value,
				    _CharT*>::__type
    __copy_move_a2(istreambuf_iterator<_CharT> __first,
		   istreambuf_iterator<_CharT> __last, _CharT* __result)
    {
      typedef istreambuf_iterator<_CharT>		   __is_iterator_type;
      typedef typename __is_iterator_type::traits_type	   traits_type;
      typedef typename __is_iterator_type::streambuf_type  streambuf_type;
      typedef typename traits_type::int_type		   int_type;

      if (__first._M_sbuf && !__last._M_sbuf)
	{
	  streambuf_type* __sb = __first._M_sbuf;
	  int_type __c = __sb->sgetc();
	  while (!traits_type::eq_int_type(__c, traits_type::eof()))
	    {
	      const streamsize __n = __sb->egptr() - __sb->gptr();
	      if (__n > 1)
		{
		  traits_type::copy(__result, __sb->gptr(), __n);
		  __sb->__safe_gbump(__n);
		  __result += __n;
		  __c = __sb->underflow();
		}
	      else
		{
		  *__result++ = traits_type::to_char_type(__c);
		  __c = __sb->snextc();
		}
	    }
	}
      return __result;
    }

#if __cplusplus >= 201103L
  template<typename _CharT, typename _Size>
    __enable_if_t<__is_char<_CharT>::__value, _CharT*>
    __copy_n_a(istreambuf_iterator<_CharT> __it, _Size __n, _CharT* __result)
    {
      if (__n == 0)
	return __result;

      __glibcxx_requires_cond(__it._M_sbuf,
			      _M_message(__gnu_debug::__msg_inc_istreambuf)
			      ._M_iterator(__it));
      _CharT* __beg = __result;
      __result += __it._M_sbuf->sgetn(__beg, __n);
      __glibcxx_requires_cond(__result - __beg == __n,
			      _M_message(__gnu_debug::__msg_inc_istreambuf)
			      ._M_iterator(__it));
      return __result;
    }
#endif // C++11

  template<typename _CharT>
    typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value,
		  		    istreambuf_iterator<_CharT> >::__type
    find(istreambuf_iterator<_CharT> __first,
	 istreambuf_iterator<_CharT> __last, const _CharT& __val)
    {
      typedef istreambuf_iterator<_CharT>		   __is_iterator_type;
      typedef typename __is_iterator_type::traits_type     traits_type;
      typedef typename __is_iterator_type::streambuf_type  streambuf_type;
      typedef typename traits_type::int_type		   int_type;
      const int_type __eof = traits_type::eof();

      if (__first._M_sbuf && !__last._M_sbuf)
	{
	  const int_type __ival = traits_type::to_int_type(__val);
	  streambuf_type* __sb = __first._M_sbuf;
	  int_type __c = __sb->sgetc();
	  while (!traits_type::eq_int_type(__c, __eof)
		 && !traits_type::eq_int_type(__c, __ival))
	    {
	      streamsize __n = __sb->egptr() - __sb->gptr();
	      if (__n > 1)
		{
		  const _CharT* __p = traits_type::find(__sb->gptr(),
							__n, __val);
		  if (__p)
		    __n = __p - __sb->gptr();
		  __sb->__safe_gbump(__n);
		  __c = __sb->sgetc();
		}
	      else
		__c = __sb->snextc();
	    }

	  __first._M_c = __eof;
	}

      return __first;
    }

  template<typename _CharT, typename _Distance>
    typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value,
				    void>::__type
    advance(istreambuf_iterator<_CharT>& __i, _Distance __n)
    {
      if (__n == 0)
	return;

      __glibcxx_assert(__n > 0);
      __glibcxx_requires_cond(!__i._M_at_eof(),
			      _M_message(__gnu_debug::__msg_inc_istreambuf)
			      ._M_iterator(__i));

      typedef istreambuf_iterator<_CharT>		   __is_iterator_type;
      typedef typename __is_iterator_type::traits_type	   traits_type;
      typedef typename __is_iterator_type::streambuf_type  streambuf_type;
      typedef typename traits_type::int_type		   int_type;
      const int_type __eof = traits_type::eof();

      streambuf_type* __sb = __i._M_sbuf;
      while (__n > 0)
	{
	  streamsize __size = __sb->egptr() - __sb->gptr();
	  if (__size > __n)
	    {
	      __sb->__safe_gbump(__n);
	      break;
	    }

	  __sb->__safe_gbump(__size);
	  __n -= __size;
	  if (traits_type::eq_int_type(__sb->underflow(), __eof))
	    {
	      __glibcxx_requires_cond(__n == 0,
				_M_message(__gnu_debug::__msg_inc_istreambuf)
				._M_iterator(__i));
	      break;
	    }
	}

      __i._M_c = __eof;
    }

// @} group iterators

_GLIBCXX_END_NAMESPACE_VERSION
} // namespace

#endif
Commit	Line	Data
725dc051 BK	1	// Streambuf iterators
725dc051 BK	2
8d9254fc	3	// Copyright (C) 1997-2020 Free Software Foundation, Inc.
725dc051 BK	4	//
	5	// This file is part of the GNU ISO C++ Library. This library is free
	6	// software; you can redistribute it and/or modify it under the
	7	// terms of the GNU General Public License as published by the
748086b7	8	// Free Software Foundation; either version 3, or (at your option)
725dc051 BK	9	// any later version.
	10
	11	// This library is distributed in the hope that it will be useful,
	12	// but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	// GNU General Public License for more details.
	15
748086b7 JJ	16	// Under Section 7 of GPL version 3, you are granted additional
	17	// permissions described in the GCC Runtime Library Exception, version
	18	// 3.1, as published by the Free Software Foundation.
	19
	20	// You should have received a copy of the GNU General Public License and
	21	// a copy of the GCC Runtime Library Exception along with this program;
	22	// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
	23	// <http://www.gnu.org/licenses/>.
725dc051	24
f910786b	25	/** @file bits/streambuf_iterator.h
729e3d3f	26	* This is an internal header file, included by other library headers.
f910786b	27	* Do not attempt to use it directly. @headername{iterator}
729e3d3f PE	28	*/
729e3d3f PE	29
3d7c150e BK	30	#ifndef _STREAMBUF_ITERATOR_H
3d7c150e BK	31	#define _STREAMBUF_ITERATOR_H 1
725dc051	32
b0a85b86 GDR	33	#pragma GCC system_header
b0a85b86 GDR	34
2e2a38cd	35	#include <streambuf>
285b36d6	36	#include <debug/debug.h>
2e2a38cd	37
12ffa228 BK	38	namespace std _GLIBCXX_VISIBILITY(default)
	39	{
	40	_GLIBCXX_BEGIN_NAMESPACE_VERSION
e324f9cb	41
8e32aa11 BK	42	/**
	43	* @addtogroup iterators
	44	* @{
	45	*/
	46
725dc051	47	// 24.5.3 Template class istreambuf_iterator
ffcec5c8	48	/// Provides input iterator semantics for streambufs.
39003c99	49	template<typename _CharT, typename _Traits>
725dc051 BK	50	class istreambuf_iterator
725dc051 BK	51	: public iterator<input_iterator_tag, _CharT, typename _Traits::off_type,
7918cb93	52	_CharT*, _CharT>
725dc051 BK	53	{
725dc051 BK	54	public:
725dc051	55	// Types:
ffcec5c8 JQ	56	//@{
ffcec5c8 JQ	57	/// Public typedefs
7918cb93 JW	58	#if __cplusplus < 201103L
	59	typedef _CharT& reference; // Changed to _CharT by LWG 445
	60	#elif __cplusplus > 201703L
9aeb3bef JW	61	// _GLIBCXX_RESOLVE_LIB_DEFECTS
	62	// 3188. istreambuf_iterator::pointer should not be unspecified
	63	using pointer = void;
	64	#endif
7918cb93	65
ed6814f7 BI	66	typedef _CharT char_type;
	67	typedef _Traits traits_type;
	68	typedef typename _Traits::int_type int_type;
	69	typedef basic_streambuf<_CharT, _Traits> streambuf_type;
	70	typedef basic_istream<_CharT, _Traits> istream_type;
ffcec5c8	71	//@}
725dc051	72
0002d5d2	73	template<typename _CharT2>
105c6331	74	friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value,
e324f9cb	75	ostreambuf_iterator<_CharT2> >::__type
0002d5d2 PC	76	copy(istreambuf_iterator<_CharT2>, istreambuf_iterator<_CharT2>,
	77	ostreambuf_iterator<_CharT2>);
	78
f0112db9	79	template<bool _IsMove, typename _CharT2>
e324f9cb	80	friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value,
105c6331	81	_CharT2*>::__type
f0112db9 PC	82	__copy_move_a2(istreambuf_iterator<_CharT2>,
f0112db9 PC	83	istreambuf_iterator<_CharT2>, _CharT2*);
0002d5d2	84
8ab38f6c FD	85	#if __cplusplus >= 201103L
	86	template<typename _CharT2, typename _Size>
	87	friend __enable_if_t<__is_char<_CharT2>::__value, _CharT2*>
	88	__copy_n_a(istreambuf_iterator<_CharT2>, _Size, _CharT2*);
	89	#endif
	90
0002d5d2	91	template<typename _CharT2>
105c6331	92	friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value,
e324f9cb	93	istreambuf_iterator<_CharT2> >::__type
0002d5d2	94	find(istreambuf_iterator<_CharT2>, istreambuf_iterator<_CharT2>,
976e25f4	95	const _CharT2&);
0002d5d2	96
e324f9cb FD	97	template<typename _CharT2, typename _Distance>
	98	friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value,
	99	void>::__type
	100	advance(istreambuf_iterator<_CharT2>&, _Distance);
	101
39003c99	102	private:
ed6814f7 BI	103	// 24.5.3 istreambuf_iterator
ed6814f7 BI	104	// p 1
39003c99 BK	105	// If the end of stream is reached (streambuf_type::sgetc()
	106	// returns traits_type::eof()), the iterator becomes equal to
	107	// the "end of stream" iterator value.
	108	// NB: This implementation assumes the "end of stream" value
	109	// is EOF, or -1.
ed6814f7	110	mutable streambuf_type* _M_sbuf;
4e914524	111	int_type _M_c;
39003c99 BK	112
39003c99 BK	113	public:
ffcec5c8	114	/// Construct end of input stream iterator.
23e4c4ee	115	_GLIBCXX_CONSTEXPR istreambuf_iterator() _GLIBCXX_USE_NOEXCEPT
f13a69ec	116	: _M_sbuf(0), _M_c(traits_type::eof()) { }
ed6814f7	117
07522ae9	118	#if __cplusplus > 201703L && __cpp_lib_concepts
120e8734 JW	119	constexpr istreambuf_iterator(default_sentinel_t) noexcept
	120	: istreambuf_iterator() { }
	121	#endif
	122
734f5023	123	#if __cplusplus >= 201103L
23e4c4ee PC	124	istreambuf_iterator(const istreambuf_iterator&) noexcept = default;
	125
	126	~istreambuf_iterator() = default;
	127	#endif
	128
ffcec5c8	129	/// Construct start of input stream iterator.
23e4c4ee	130	istreambuf_iterator(istream_type& __s) _GLIBCXX_USE_NOEXCEPT
f13a69ec	131	: _M_sbuf(__s.rdbuf()), _M_c(traits_type::eof()) { }
725dc051	132
ffcec5c8	133	/// Construct start of streambuf iterator.
23e4c4ee	134	istreambuf_iterator(streambuf_type* __s) _GLIBCXX_USE_NOEXCEPT
f13a69ec	135	: _M_sbuf(__s), _M_c(traits_type::eof()) { }
ed6814f7	136
a1417556 JW	137	#if __cplusplus >= 201103L
	138	istreambuf_iterator&
	139	operator=(const istreambuf_iterator&) noexcept = default;
	140	#endif
	141
ffcec5c8 JQ	142	/// Return the current character pointed to by iterator. This returns
	143	/// streambuf.sgetc(). It cannot be assigned. NB: The result of
	144	/// operator*() on an end of stream is undefined.
ed6814f7	145	char_type
725dc051	146	operator*() const
ed6814f7	147	{
4e914524 PO	148	int_type __c = _M_get();
4e914524 PO	149
285b36d6 BK	150	#ifdef _GLIBCXX_DEBUG_PEDANTIC
	151	// Dereferencing a past-the-end istreambuf_iterator is a
	152	// libstdc++ extension
4e914524	153	__glibcxx_requires_cond(!_S_is_eof(__c),
285b36d6	154	_M_message(__gnu_debug::__msg_deref_istreambuf)
ed6814f7	155	._M_iterator(*this));
285b36d6	156	#endif
4e914524	157	return traits_type::to_char_type(__c);
285b36d6	158	}
ffcec5c8 JQ	159
ffcec5c8 JQ	160	/// Advance the iterator. Calls streambuf.sbumpc().
ed6814f7	161	istreambuf_iterator&
725dc051	162	operator++()
ed6814f7	163	{
4e914524 PO	164	__glibcxx_requires_cond(_M_sbuf &&
4e914524 PO	165	(!_S_is_eof(_M_c) \|\| !_S_is_eof(_M_sbuf->sgetc())),
285b36d6	166	_M_message(__gnu_debug::__msg_inc_istreambuf)
ed6814f7	167	._M_iterator(*this));
4e914524 PO	168
	169	_M_sbuf->sbumpc();
	170	_M_c = traits_type::eof();
ed6814f7	171	return *this;
725dc051 BK	172	}
725dc051 BK	173
ffcec5c8	174	/// Advance the iterator. Calls streambuf.sbumpc().
b581eaf7	175	istreambuf_iterator
725dc051 BK	176	operator++(int)
725dc051 BK	177	{
4e914524 PO	178	__glibcxx_requires_cond(_M_sbuf &&
4e914524 PO	179	(!_S_is_eof(_M_c) \|\| !_S_is_eof(_M_sbuf->sgetc())),
285b36d6	180	_M_message(__gnu_debug::__msg_inc_istreambuf)
ed6814f7	181	._M_iterator(*this));
285b36d6	182
b581eaf7	183	istreambuf_iterator __old = *this;
4e914524 PO	184	__old._M_c = _M_sbuf->sbumpc();
4e914524 PO	185	_M_c = traits_type::eof();
ed6814f7	186	return __old;
725dc051	187	}
725dc051	188
f5677b15	189	// _GLIBCXX_RESOLVE_LIB_DEFECTS
725dc051	190	// 110 istreambuf_iterator::equal not const
0e7300bb	191	// NB: there is also number 111 (NAD) relevant to this function.
ffcec5c8	192	/// Return true both iterators are end or both are not end.
ed6814f7	193	bool
b581eaf7	194	equal(const istreambuf_iterator& __b) const
6bfcbf0d	195	{ return _M_at_eof() == __b._M_at_eof(); }
9875ea05 BK	196
9875ea05 BK	197	private:
ed6814f7	198	int_type
9875ea05	199	_M_get() const
ed6814f7	200	{
4e914524 PO	201	int_type __ret = _M_c;
	202	if (_M_sbuf && _S_is_eof(__ret) && _S_is_eof(__ret = _M_sbuf->sgetc()))
	203	_M_sbuf = 0;
9875ea05 BK	204	return __ret;
9875ea05 BK	205	}
285b36d6	206
ed6814f7	207	bool
285b36d6	208	_M_at_eof() const
4e914524 PO	209	{ return _S_is_eof(_M_get()); }
	210
	211	static bool
	212	_S_is_eof(int_type __c)
285b36d6 BK	213	{
285b36d6 BK	214	const int_type __eof = traits_type::eof();
4e914524	215	return traits_type::eq_int_type(__c, __eof);
285b36d6	216	}
120e8734	217
07522ae9	218	#if __cplusplus > 201703L && __cpp_lib_concepts
120e8734 JW	219	friend bool
	220	operator==(const istreambuf_iterator& __i, default_sentinel_t __s)
	221	{ return __i._M_at_eof(); }
	222	#endif
725dc051 BK	223	};
	224
	225	template<typename _CharT, typename _Traits>
ed6814f7	226	inline bool
725dc051 BK	227	operator==(const istreambuf_iterator<_CharT, _Traits>& __a,
	228	const istreambuf_iterator<_CharT, _Traits>& __b)
	229	{ return __a.equal(__b); }
	230
	231	template<typename _CharT, typename _Traits>
ed6814f7	232	inline bool
725dc051 BK	233	operator!=(const istreambuf_iterator<_CharT, _Traits>& __a,
	234	const istreambuf_iterator<_CharT, _Traits>& __b)
	235	{ return !__a.equal(__b); }
5c352a47	236
ffcec5c8	237	/// Provides output iterator semantics for streambufs.
5c352a47 BK	238	template<typename _CharT, typename _Traits>
	239	class ostreambuf_iterator
	240	: public iterator<output_iterator_tag, void, void, void, void>
	241	{
	242	public:
	243	// Types:
ffcec5c8 JQ	244	//@{
ffcec5c8 JQ	245	/// Public typedefs
9aeb3bef JW	246	#if __cplusplus > 201703L
	247	using difference_type = ptrdiff_t;
	248	#endif
e324f9cb FD	249	typedef _CharT char_type;
e324f9cb FD	250	typedef _Traits traits_type;
5c352a47 BK	251	typedef basic_streambuf<_CharT, _Traits> streambuf_type;
5c352a47 BK	252	typedef basic_ostream<_CharT, _Traits> ostream_type;
ffcec5c8	253	//@}
5c352a47	254
0002d5d2	255	template<typename _CharT2>
105c6331	256	friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value,
e324f9cb	257	ostreambuf_iterator<_CharT2> >::__type
0002d5d2 PC	258	copy(istreambuf_iterator<_CharT2>, istreambuf_iterator<_CharT2>,
	259	ostreambuf_iterator<_CharT2>);
	260
5c352a47	261	private:
ed6814f7 BI	262	streambuf_type* _M_sbuf;
ed6814f7 BI	263	bool _M_failed;
5c352a47 BK	264
5c352a47 BK	265	public:
9aeb3bef JW	266
	267	#if __cplusplus > 201703L
	268	constexpr
	269	ostreambuf_iterator() noexcept
	270	: _M_sbuf(nullptr), _M_failed(true) { }
	271	#endif
	272
ffcec5c8	273	/// Construct output iterator from ostream.
23e4c4ee	274	ostreambuf_iterator(ostream_type& __s) _GLIBCXX_USE_NOEXCEPT
5c352a47	275	: _M_sbuf(__s.rdbuf()), _M_failed(!_M_sbuf) { }
ed6814f7	276
ffcec5c8	277	/// Construct output iterator from streambuf.
23e4c4ee	278	ostreambuf_iterator(streambuf_type* __s) _GLIBCXX_USE_NOEXCEPT
5c352a47 BK	279	: _M_sbuf(__s), _M_failed(!_M_sbuf) { }
5c352a47 BK	280
ffcec5c8	281	/// Write character to streambuf. Calls streambuf.sputc().
ed6814f7	282	ostreambuf_iterator&
2e2a38cd BK	283	operator=(_CharT __c)
2e2a38cd BK	284	{
ed6814f7	285	if (!_M_failed &&
2e2a38cd BK	286	_Traits::eq_int_type(_M_sbuf->sputc(__c), _Traits::eof()))
	287	_M_failed = true;
	288	return *this;
	289	}
5c352a47	290
ffcec5c8	291	/// Return *this.
ed6814f7	292	ostreambuf_iterator&
e0ec69c9	293	operator*()
5c352a47 BK	294	{ return *this; }
5c352a47 BK	295
ffcec5c8	296	/// Return *this.
ed6814f7	297	ostreambuf_iterator&
e0ec69c9	298	operator++(int)
5c352a47 BK	299	{ return *this; }
5c352a47 BK	300
ffcec5c8	301	/// Return *this.
ed6814f7	302	ostreambuf_iterator&
e0ec69c9	303	operator++()
5c352a47 BK	304	{ return *this; }
5c352a47 BK	305
ffcec5c8	306	/// Return true if previous operator=() failed.
ed6814f7	307	bool
23e4c4ee	308	failed() const _GLIBCXX_USE_NOEXCEPT
5c352a47	309	{ return _M_failed; }
5c352a47	310
ed6814f7	311	ostreambuf_iterator&
2e2a38cd BK	312	_M_put(const _CharT* __ws, streamsize __len)
2e2a38cd BK	313	{
53279c10	314	if (__builtin_expect(!_M_failed, true)
15d72060 PC	315	&& __builtin_expect(this->_M_sbuf->sputn(__ws, __len) != __len,
15d72060 PC	316	false))
53279c10	317	_M_failed = true;
2e2a38cd BK	318	return *this;
	319	}
	320	};
3cbc7af0	321
0002d5d2 PC	322	// Overloads for streambuf iterators.
0002d5d2 PC	323	template<typename _CharT>
105c6331	324	typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value,
e324f9cb	325	ostreambuf_iterator<_CharT> >::__type
0002d5d2 PC	326	copy(istreambuf_iterator<_CharT> __first,
	327	istreambuf_iterator<_CharT> __last,
	328	ostreambuf_iterator<_CharT> __result)
	329	{
	330	if (__first._M_sbuf && !__last._M_sbuf && !__result._M_failed)
	331	{
	332	bool __ineof;
	333	__copy_streambufs_eof(__first._M_sbuf, __result._M_sbuf, __ineof);
	334	if (!__ineof)
	335	__result._M_failed = true;
	336	}
	337	return __result;
	338	}
	339
f0112db9	340	template<bool _IsMove, typename _CharT>
e324f9cb FD	341	typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value,
e324f9cb FD	342	ostreambuf_iterator<_CharT> >::__type
f0112db9 PC	343	__copy_move_a2(_CharT* __first, _CharT* __last,
f0112db9 PC	344	ostreambuf_iterator<_CharT> __result)
0002d5d2 PC	345	{
	346	const streamsize __num = __last - __first;
	347	if (__num > 0)
	348	__result._M_put(__first, __num);
	349	return __result;
	350	}
	351
f0112db9	352	template<bool _IsMove, typename _CharT>
105c6331 BK	353	typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value,
105c6331 BK	354	ostreambuf_iterator<_CharT> >::__type
f0112db9 PC	355	__copy_move_a2(const _CharT* __first, const _CharT* __last,
f0112db9 PC	356	ostreambuf_iterator<_CharT> __result)
0002d5d2 PC	357	{
	358	const streamsize __num = __last - __first;
	359	if (__num > 0)
	360	__result._M_put(__first, __num);
	361	return __result;
	362	}
	363
f0112db9	364	template<bool _IsMove, typename _CharT>
e324f9cb FD	365	typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value,
e324f9cb FD	366	_CharT*>::__type
f0112db9 PC	367	__copy_move_a2(istreambuf_iterator<_CharT> __first,
f0112db9 PC	368	istreambuf_iterator<_CharT> __last, _CharT* __result)
0002d5d2	369	{
e324f9cb FD	370	typedef istreambuf_iterator<_CharT> __is_iterator_type;
e324f9cb FD	371	typedef typename __is_iterator_type::traits_type traits_type;
0002d5d2	372	typedef typename __is_iterator_type::streambuf_type streambuf_type;
e324f9cb	373	typedef typename traits_type::int_type int_type;
0002d5d2 PC	374
	375	if (__first._M_sbuf && !__last._M_sbuf)
	376	{
	377	streambuf_type* __sb = __first._M_sbuf;
	378	int_type __c = __sb->sgetc();
	379	while (!traits_type::eq_int_type(__c, traits_type::eof()))
	380	{
	381	const streamsize __n = __sb->egptr() - __sb->gptr();
	382	if (__n > 1)
	383	{
	384	traits_type::copy(__result, __sb->gptr(), __n);
1139a735	385	__sb->__safe_gbump(__n);
0002d5d2 PC	386	__result += __n;
	387	__c = __sb->underflow();
	388	}
	389	else
	390	{
	391	*__result++ = traits_type::to_char_type(__c);
	392	__c = __sb->snextc();
	393	}
	394	}
	395	}
	396	return __result;
	397	}
	398
8ab38f6c FD	399	#if __cplusplus >= 201103L
	400	template<typename _CharT, typename _Size>
	401	__enable_if_t<__is_char<_CharT>::__value, _CharT*>
	402	__copy_n_a(istreambuf_iterator<_CharT> __it, _Size __n, _CharT* __result)
	403	{
	404	if (__n == 0)
	405	return __result;
	406
	407	__glibcxx_requires_cond(__it._M_sbuf,
	408	_M_message(__gnu_debug::__msg_inc_istreambuf)
	409	._M_iterator(__it));
	410	_CharT* __beg = __result;
	411	__result += __it._M_sbuf->sgetn(__beg, __n);
	412	__glibcxx_requires_cond(__result - __beg == __n,
	413	_M_message(__gnu_debug::__msg_inc_istreambuf)
	414	._M_iterator(__it));
	415	return __result;
	416	}
	417	#endif // C++11
	418
0002d5d2	419	template<typename _CharT>
105c6331 BK	420	typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value,
105c6331 BK	421	istreambuf_iterator<_CharT> >::__type
0002d5d2	422	find(istreambuf_iterator<_CharT> __first,
976e25f4	423	istreambuf_iterator<_CharT> __last, const _CharT& __val)
0002d5d2	424	{
e324f9cb	425	typedef istreambuf_iterator<_CharT> __is_iterator_type;
0002d5d2 PC	426	typedef typename __is_iterator_type::traits_type traits_type;
0002d5d2 PC	427	typedef typename __is_iterator_type::streambuf_type streambuf_type;
e324f9cb	428	typedef typename traits_type::int_type int_type;
4e914524	429	const int_type __eof = traits_type::eof();
0002d5d2 PC	430
	431	if (__first._M_sbuf && !__last._M_sbuf)
	432	{
	433	const int_type __ival = traits_type::to_int_type(__val);
	434	streambuf_type* __sb = __first._M_sbuf;
	435	int_type __c = __sb->sgetc();
4e914524	436	while (!traits_type::eq_int_type(__c, __eof)
0002d5d2 PC	437	&& !traits_type::eq_int_type(__c, __ival))
	438	{
	439	streamsize __n = __sb->egptr() - __sb->gptr();
	440	if (__n > 1)
	441	{
	442	const _CharT* __p = traits_type::find(__sb->gptr(),
	443	__n, __val);
	444	if (__p)
	445	__n = __p - __sb->gptr();
1139a735	446	__sb->__safe_gbump(__n);
0002d5d2 PC	447	__c = __sb->sgetc();
	448	}
	449	else
	450	__c = __sb->snextc();
	451	}
	452
4e914524	453	__first._M_c = __eof;
0002d5d2	454	}
4e914524	455
0002d5d2 PC	456	return __first;
	457	}
	458
e324f9cb FD	459	template<typename _CharT, typename _Distance>
	460	typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value,
	461	void>::__type
	462	advance(istreambuf_iterator<_CharT>& __i, _Distance __n)
	463	{
	464	if (__n == 0)
	465	return;
	466
	467	__glibcxx_assert(__n > 0);
	468	__glibcxx_requires_cond(!__i._M_at_eof(),
	469	_M_message(__gnu_debug::__msg_inc_istreambuf)
	470	._M_iterator(__i));
	471
	472	typedef istreambuf_iterator<_CharT> __is_iterator_type;
	473	typedef typename __is_iterator_type::traits_type traits_type;
	474	typedef typename __is_iterator_type::streambuf_type streambuf_type;
	475	typedef typename traits_type::int_type int_type;
	476	const int_type __eof = traits_type::eof();
	477
	478	streambuf_type* __sb = __i._M_sbuf;
	479	while (__n > 0)
	480	{
	481	streamsize __size = __sb->egptr() - __sb->gptr();
	482	if (__size > __n)
	483	{
	484	__sb->__safe_gbump(__n);
	485	break;
	486	}
	487
	488	__sb->__safe_gbump(__size);
	489	__n -= __size;
	490	if (traits_type::eq_int_type(__sb->underflow(), __eof))
	491	{
	492	__glibcxx_requires_cond(__n == 0,
	493	_M_message(__gnu_debug::__msg_inc_istreambuf)
	494	._M_iterator(__i));
	495	break;
	496	}
	497	}
	498
	499	__i._M_c = __eof;
	500	}
	501
8e32aa11 BK	502	// @} group iterators
8e32aa11 BK	503
12ffa228 BK	504	_GLIBCXX_END_NAMESPACE_VERSION
12ffa228 BK	505	} // namespace
3cbc7af0	506
b85381b9	507	#endif