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

// Streambuf iterators

// Copyright (C) 1997-2019 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*,
#if __cplusplus >= 201103L
    // LWG 445.
		      _CharT>
#else
		      _CharT&>
#endif
    {
    public:
      // Types:
      //@{
      /// Public typedefs
      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 >= 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);
      }
    };

  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
      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:
      ///  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
a5544970	3	// Copyright (C) 1997-2019 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,
e324f9cb	52	_CharT*,
734f5023	53	#if __cplusplus >= 201103L
ebb6e4af PC	54	// LWG 445.
	55	_CharT>
	56	#else
	57	_CharT&>
	58	#endif
725dc051 BK	59	{
725dc051 BK	60	public:
725dc051	61	// Types:
ffcec5c8 JQ	62	//@{
ffcec5c8 JQ	63	/// Public typedefs
ed6814f7 BI	64	typedef _CharT char_type;
	65	typedef _Traits traits_type;
	66	typedef typename _Traits::int_type int_type;
	67	typedef basic_streambuf<_CharT, _Traits> streambuf_type;
	68	typedef basic_istream<_CharT, _Traits> istream_type;
ffcec5c8	69	//@}
725dc051	70
0002d5d2	71	template<typename _CharT2>
105c6331	72	friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value,
e324f9cb	73	ostreambuf_iterator<_CharT2> >::__type
0002d5d2 PC	74	copy(istreambuf_iterator<_CharT2>, istreambuf_iterator<_CharT2>,
	75	ostreambuf_iterator<_CharT2>);
	76
f0112db9	77	template<bool _IsMove, typename _CharT2>
e324f9cb	78	friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value,
105c6331	79	_CharT2*>::__type
f0112db9 PC	80	__copy_move_a2(istreambuf_iterator<_CharT2>,
f0112db9 PC	81	istreambuf_iterator<_CharT2>, _CharT2*);
0002d5d2	82
8ab38f6c FD	83	#if __cplusplus >= 201103L
	84	template<typename _CharT2, typename _Size>
	85	friend __enable_if_t<__is_char<_CharT2>::__value, _CharT2*>
	86	__copy_n_a(istreambuf_iterator<_CharT2>, _Size, _CharT2*);
	87	#endif
	88
0002d5d2	89	template<typename _CharT2>
105c6331	90	friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value,
e324f9cb	91	istreambuf_iterator<_CharT2> >::__type
0002d5d2	92	find(istreambuf_iterator<_CharT2>, istreambuf_iterator<_CharT2>,
976e25f4	93	const _CharT2&);
0002d5d2	94
e324f9cb FD	95	template<typename _CharT2, typename _Distance>
	96	friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value,
	97	void>::__type
	98	advance(istreambuf_iterator<_CharT2>&, _Distance);
	99
39003c99	100	private:
ed6814f7 BI	101	// 24.5.3 istreambuf_iterator
ed6814f7 BI	102	// p 1
39003c99 BK	103	// If the end of stream is reached (streambuf_type::sgetc()
	104	// returns traits_type::eof()), the iterator becomes equal to
	105	// the "end of stream" iterator value.
	106	// NB: This implementation assumes the "end of stream" value
	107	// is EOF, or -1.
ed6814f7	108	mutable streambuf_type* _M_sbuf;
4e914524	109	int_type _M_c;
39003c99 BK	110
39003c99 BK	111	public:
ffcec5c8	112	/// Construct end of input stream iterator.
23e4c4ee	113	_GLIBCXX_CONSTEXPR istreambuf_iterator() _GLIBCXX_USE_NOEXCEPT
f13a69ec	114	: _M_sbuf(0), _M_c(traits_type::eof()) { }
ed6814f7	115
734f5023	116	#if __cplusplus >= 201103L
23e4c4ee PC	117	istreambuf_iterator(const istreambuf_iterator&) noexcept = default;
	118
	119	~istreambuf_iterator() = default;
	120	#endif
	121
ffcec5c8	122	/// Construct start of input stream iterator.
23e4c4ee	123	istreambuf_iterator(istream_type& __s) _GLIBCXX_USE_NOEXCEPT
f13a69ec	124	: _M_sbuf(__s.rdbuf()), _M_c(traits_type::eof()) { }
725dc051	125
ffcec5c8	126	/// Construct start of streambuf iterator.
23e4c4ee	127	istreambuf_iterator(streambuf_type* __s) _GLIBCXX_USE_NOEXCEPT
f13a69ec	128	: _M_sbuf(__s), _M_c(traits_type::eof()) { }
ed6814f7	129
a1417556 JW	130	#if __cplusplus >= 201103L
	131	istreambuf_iterator&
	132	operator=(const istreambuf_iterator&) noexcept = default;
	133	#endif
	134
ffcec5c8 JQ	135	/// Return the current character pointed to by iterator. This returns
	136	/// streambuf.sgetc(). It cannot be assigned. NB: The result of
	137	/// operator*() on an end of stream is undefined.
ed6814f7	138	char_type
725dc051	139	operator*() const
ed6814f7	140	{
4e914524 PO	141	int_type __c = _M_get();
4e914524 PO	142
285b36d6 BK	143	#ifdef _GLIBCXX_DEBUG_PEDANTIC
	144	// Dereferencing a past-the-end istreambuf_iterator is a
	145	// libstdc++ extension
4e914524	146	__glibcxx_requires_cond(!_S_is_eof(__c),
285b36d6	147	_M_message(__gnu_debug::__msg_deref_istreambuf)
ed6814f7	148	._M_iterator(*this));
285b36d6	149	#endif
4e914524	150	return traits_type::to_char_type(__c);
285b36d6	151	}
ffcec5c8 JQ	152
ffcec5c8 JQ	153	/// Advance the iterator. Calls streambuf.sbumpc().
ed6814f7	154	istreambuf_iterator&
725dc051	155	operator++()
ed6814f7	156	{
4e914524 PO	157	__glibcxx_requires_cond(_M_sbuf &&
4e914524 PO	158	(!_S_is_eof(_M_c) \|\| !_S_is_eof(_M_sbuf->sgetc())),
285b36d6	159	_M_message(__gnu_debug::__msg_inc_istreambuf)
ed6814f7	160	._M_iterator(*this));
4e914524 PO	161
	162	_M_sbuf->sbumpc();
	163	_M_c = traits_type::eof();
ed6814f7	164	return *this;
725dc051 BK	165	}
725dc051 BK	166
ffcec5c8	167	/// Advance the iterator. Calls streambuf.sbumpc().
b581eaf7	168	istreambuf_iterator
725dc051 BK	169	operator++(int)
725dc051 BK	170	{
4e914524 PO	171	__glibcxx_requires_cond(_M_sbuf &&
4e914524 PO	172	(!_S_is_eof(_M_c) \|\| !_S_is_eof(_M_sbuf->sgetc())),
285b36d6	173	_M_message(__gnu_debug::__msg_inc_istreambuf)
ed6814f7	174	._M_iterator(*this));
285b36d6	175
b581eaf7	176	istreambuf_iterator __old = *this;
4e914524 PO	177	__old._M_c = _M_sbuf->sbumpc();
4e914524 PO	178	_M_c = traits_type::eof();
ed6814f7	179	return __old;
725dc051	180	}
725dc051	181
f5677b15	182	// _GLIBCXX_RESOLVE_LIB_DEFECTS
725dc051	183	// 110 istreambuf_iterator::equal not const
0e7300bb	184	// NB: there is also number 111 (NAD) relevant to this function.
ffcec5c8	185	/// Return true both iterators are end or both are not end.
ed6814f7	186	bool
b581eaf7	187	equal(const istreambuf_iterator& __b) const
6bfcbf0d	188	{ return _M_at_eof() == __b._M_at_eof(); }
9875ea05 BK	189
9875ea05 BK	190	private:
ed6814f7	191	int_type
9875ea05	192	_M_get() const
ed6814f7	193	{
4e914524 PO	194	int_type __ret = _M_c;
	195	if (_M_sbuf && _S_is_eof(__ret) && _S_is_eof(__ret = _M_sbuf->sgetc()))
	196	_M_sbuf = 0;
9875ea05 BK	197	return __ret;
9875ea05 BK	198	}
285b36d6	199
ed6814f7	200	bool
285b36d6	201	_M_at_eof() const
4e914524 PO	202	{ return _S_is_eof(_M_get()); }
	203
	204	static bool
	205	_S_is_eof(int_type __c)
285b36d6 BK	206	{
285b36d6 BK	207	const int_type __eof = traits_type::eof();
4e914524	208	return traits_type::eq_int_type(__c, __eof);
285b36d6	209	}
725dc051 BK	210	};
	211
	212	template<typename _CharT, typename _Traits>
ed6814f7	213	inline bool
725dc051 BK	214	operator==(const istreambuf_iterator<_CharT, _Traits>& __a,
	215	const istreambuf_iterator<_CharT, _Traits>& __b)
	216	{ return __a.equal(__b); }
	217
	218	template<typename _CharT, typename _Traits>
ed6814f7	219	inline bool
725dc051 BK	220	operator!=(const istreambuf_iterator<_CharT, _Traits>& __a,
	221	const istreambuf_iterator<_CharT, _Traits>& __b)
	222	{ return !__a.equal(__b); }
5c352a47	223
ffcec5c8	224	/// Provides output iterator semantics for streambufs.
5c352a47 BK	225	template<typename _CharT, typename _Traits>
	226	class ostreambuf_iterator
	227	: public iterator<output_iterator_tag, void, void, void, void>
	228	{
	229	public:
	230	// Types:
ffcec5c8 JQ	231	//@{
ffcec5c8 JQ	232	/// Public typedefs
e324f9cb FD	233	typedef _CharT char_type;
e324f9cb FD	234	typedef _Traits traits_type;
5c352a47 BK	235	typedef basic_streambuf<_CharT, _Traits> streambuf_type;
5c352a47 BK	236	typedef basic_ostream<_CharT, _Traits> ostream_type;
ffcec5c8	237	//@}
5c352a47	238
0002d5d2	239	template<typename _CharT2>
105c6331	240	friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value,
e324f9cb	241	ostreambuf_iterator<_CharT2> >::__type
0002d5d2 PC	242	copy(istreambuf_iterator<_CharT2>, istreambuf_iterator<_CharT2>,
	243	ostreambuf_iterator<_CharT2>);
	244
5c352a47	245	private:
ed6814f7 BI	246	streambuf_type* _M_sbuf;
ed6814f7 BI	247	bool _M_failed;
5c352a47 BK	248
5c352a47 BK	249	public:
ffcec5c8	250	/// Construct output iterator from ostream.
23e4c4ee	251	ostreambuf_iterator(ostream_type& __s) _GLIBCXX_USE_NOEXCEPT
5c352a47	252	: _M_sbuf(__s.rdbuf()), _M_failed(!_M_sbuf) { }
ed6814f7	253
ffcec5c8	254	/// Construct output iterator from streambuf.
23e4c4ee	255	ostreambuf_iterator(streambuf_type* __s) _GLIBCXX_USE_NOEXCEPT
5c352a47 BK	256	: _M_sbuf(__s), _M_failed(!_M_sbuf) { }
5c352a47 BK	257
ffcec5c8	258	/// Write character to streambuf. Calls streambuf.sputc().
ed6814f7	259	ostreambuf_iterator&
2e2a38cd BK	260	operator=(_CharT __c)
2e2a38cd BK	261	{
ed6814f7	262	if (!_M_failed &&
2e2a38cd BK	263	_Traits::eq_int_type(_M_sbuf->sputc(__c), _Traits::eof()))
	264	_M_failed = true;
	265	return *this;
	266	}
5c352a47	267
ffcec5c8	268	/// Return *this.
ed6814f7	269	ostreambuf_iterator&
e0ec69c9	270	operator*()
5c352a47 BK	271	{ return *this; }
5c352a47 BK	272
ffcec5c8	273	/// Return *this.
ed6814f7	274	ostreambuf_iterator&
e0ec69c9	275	operator++(int)
5c352a47 BK	276	{ return *this; }
5c352a47 BK	277
ffcec5c8	278	/// Return *this.
ed6814f7	279	ostreambuf_iterator&
e0ec69c9	280	operator++()
5c352a47 BK	281	{ return *this; }
5c352a47 BK	282
ffcec5c8	283	/// Return true if previous operator=() failed.
ed6814f7	284	bool
23e4c4ee	285	failed() const _GLIBCXX_USE_NOEXCEPT
5c352a47	286	{ return _M_failed; }
5c352a47	287
ed6814f7	288	ostreambuf_iterator&
2e2a38cd BK	289	_M_put(const _CharT* __ws, streamsize __len)
2e2a38cd BK	290	{
53279c10	291	if (__builtin_expect(!_M_failed, true)
15d72060 PC	292	&& __builtin_expect(this->_M_sbuf->sputn(__ws, __len) != __len,
15d72060 PC	293	false))
53279c10	294	_M_failed = true;
2e2a38cd BK	295	return *this;
	296	}
	297	};
3cbc7af0	298
0002d5d2 PC	299	// Overloads for streambuf iterators.
0002d5d2 PC	300	template<typename _CharT>
105c6331	301	typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value,
e324f9cb	302	ostreambuf_iterator<_CharT> >::__type
0002d5d2 PC	303	copy(istreambuf_iterator<_CharT> __first,
	304	istreambuf_iterator<_CharT> __last,
	305	ostreambuf_iterator<_CharT> __result)
	306	{
	307	if (__first._M_sbuf && !__last._M_sbuf && !__result._M_failed)
	308	{
	309	bool __ineof;
	310	__copy_streambufs_eof(__first._M_sbuf, __result._M_sbuf, __ineof);
	311	if (!__ineof)
	312	__result._M_failed = true;
	313	}
	314	return __result;
	315	}
	316
f0112db9	317	template<bool _IsMove, typename _CharT>
e324f9cb FD	318	typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value,
e324f9cb FD	319	ostreambuf_iterator<_CharT> >::__type
f0112db9 PC	320	__copy_move_a2(_CharT* __first, _CharT* __last,
f0112db9 PC	321	ostreambuf_iterator<_CharT> __result)
0002d5d2 PC	322	{
	323	const streamsize __num = __last - __first;
	324	if (__num > 0)
	325	__result._M_put(__first, __num);
	326	return __result;
	327	}
	328
f0112db9	329	template<bool _IsMove, typename _CharT>
105c6331 BK	330	typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value,
105c6331 BK	331	ostreambuf_iterator<_CharT> >::__type
f0112db9 PC	332	__copy_move_a2(const _CharT* __first, const _CharT* __last,
f0112db9 PC	333	ostreambuf_iterator<_CharT> __result)
0002d5d2 PC	334	{
	335	const streamsize __num = __last - __first;
	336	if (__num > 0)
	337	__result._M_put(__first, __num);
	338	return __result;
	339	}
	340
f0112db9	341	template<bool _IsMove, typename _CharT>
e324f9cb FD	342	typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value,
e324f9cb FD	343	_CharT*>::__type
f0112db9 PC	344	__copy_move_a2(istreambuf_iterator<_CharT> __first,
f0112db9 PC	345	istreambuf_iterator<_CharT> __last, _CharT* __result)
0002d5d2	346	{
e324f9cb FD	347	typedef istreambuf_iterator<_CharT> __is_iterator_type;
e324f9cb FD	348	typedef typename __is_iterator_type::traits_type traits_type;
0002d5d2	349	typedef typename __is_iterator_type::streambuf_type streambuf_type;
e324f9cb	350	typedef typename traits_type::int_type int_type;
0002d5d2 PC	351
	352	if (__first._M_sbuf && !__last._M_sbuf)
	353	{
	354	streambuf_type* __sb = __first._M_sbuf;
	355	int_type __c = __sb->sgetc();
	356	while (!traits_type::eq_int_type(__c, traits_type::eof()))
	357	{
	358	const streamsize __n = __sb->egptr() - __sb->gptr();
	359	if (__n > 1)
	360	{
	361	traits_type::copy(__result, __sb->gptr(), __n);
1139a735	362	__sb->__safe_gbump(__n);
0002d5d2 PC	363	__result += __n;
	364	__c = __sb->underflow();
	365	}
	366	else
	367	{
	368	*__result++ = traits_type::to_char_type(__c);
	369	__c = __sb->snextc();
	370	}
	371	}
	372	}
	373	return __result;
	374	}
	375
8ab38f6c FD	376	#if __cplusplus >= 201103L
	377	template<typename _CharT, typename _Size>
	378	__enable_if_t<__is_char<_CharT>::__value, _CharT*>
	379	__copy_n_a(istreambuf_iterator<_CharT> __it, _Size __n, _CharT* __result)
	380	{
	381	if (__n == 0)
	382	return __result;
	383
	384	__glibcxx_requires_cond(__it._M_sbuf,
	385	_M_message(__gnu_debug::__msg_inc_istreambuf)
	386	._M_iterator(__it));
	387	_CharT* __beg = __result;
	388	__result += __it._M_sbuf->sgetn(__beg, __n);
	389	__glibcxx_requires_cond(__result - __beg == __n,
	390	_M_message(__gnu_debug::__msg_inc_istreambuf)
	391	._M_iterator(__it));
	392	return __result;
	393	}
	394	#endif // C++11
	395
0002d5d2	396	template<typename _CharT>
105c6331 BK	397	typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value,
105c6331 BK	398	istreambuf_iterator<_CharT> >::__type
0002d5d2	399	find(istreambuf_iterator<_CharT> __first,
976e25f4	400	istreambuf_iterator<_CharT> __last, const _CharT& __val)
0002d5d2	401	{
e324f9cb	402	typedef istreambuf_iterator<_CharT> __is_iterator_type;
0002d5d2 PC	403	typedef typename __is_iterator_type::traits_type traits_type;
0002d5d2 PC	404	typedef typename __is_iterator_type::streambuf_type streambuf_type;
e324f9cb	405	typedef typename traits_type::int_type int_type;
4e914524	406	const int_type __eof = traits_type::eof();
0002d5d2 PC	407
	408	if (__first._M_sbuf && !__last._M_sbuf)
	409	{
	410	const int_type __ival = traits_type::to_int_type(__val);
	411	streambuf_type* __sb = __first._M_sbuf;
	412	int_type __c = __sb->sgetc();
4e914524	413	while (!traits_type::eq_int_type(__c, __eof)
0002d5d2 PC	414	&& !traits_type::eq_int_type(__c, __ival))
	415	{
	416	streamsize __n = __sb->egptr() - __sb->gptr();
	417	if (__n > 1)
	418	{
	419	const _CharT* __p = traits_type::find(__sb->gptr(),
	420	__n, __val);
	421	if (__p)
	422	__n = __p - __sb->gptr();
1139a735	423	__sb->__safe_gbump(__n);
0002d5d2 PC	424	__c = __sb->sgetc();
	425	}
	426	else
	427	__c = __sb->snextc();
	428	}
	429
4e914524	430	__first._M_c = __eof;
0002d5d2	431	}
4e914524	432
0002d5d2 PC	433	return __first;
	434	}
	435
e324f9cb FD	436	template<typename _CharT, typename _Distance>
	437	typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value,
	438	void>::__type
	439	advance(istreambuf_iterator<_CharT>& __i, _Distance __n)
	440	{
	441	if (__n == 0)
	442	return;
	443
	444	__glibcxx_assert(__n > 0);
	445	__glibcxx_requires_cond(!__i._M_at_eof(),
	446	_M_message(__gnu_debug::__msg_inc_istreambuf)
	447	._M_iterator(__i));
	448
	449	typedef istreambuf_iterator<_CharT> __is_iterator_type;
	450	typedef typename __is_iterator_type::traits_type traits_type;
	451	typedef typename __is_iterator_type::streambuf_type streambuf_type;
	452	typedef typename traits_type::int_type int_type;
	453	const int_type __eof = traits_type::eof();
	454
	455	streambuf_type* __sb = __i._M_sbuf;
	456	while (__n > 0)
	457	{
	458	streamsize __size = __sb->egptr() - __sb->gptr();
	459	if (__size > __n)
	460	{
	461	__sb->__safe_gbump(__n);
	462	break;
	463	}
	464
	465	__sb->__safe_gbump(__size);
	466	__n -= __size;
	467	if (traits_type::eq_int_type(__sb->underflow(), __eof))
	468	{
	469	__glibcxx_requires_cond(__n == 0,
	470	_M_message(__gnu_debug::__msg_inc_istreambuf)
	471	._M_iterator(__i));
	472	break;
	473	}
	474	}
	475
	476	__i._M_c = __eof;
	477	}
	478
8e32aa11 BK	479	// @} group iterators
8e32aa11 BK	480
12ffa228 BK	481	_GLIBCXX_END_NAMESPACE_VERSION
12ffa228 BK	482	} // namespace
3cbc7af0	483
b85381b9	484	#endif