--- /dev/null
+// Stream iterators
+
+// Copyright (C) 2001, 2004, 2005, 2009, 2010 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/stream_iterator.h
+ * This is an internal header file, included by other library headers.
+ * Do not attempt to use it directly. @headername{iterator}
+ */
+
+#ifndef _STREAM_ITERATOR_H
+#define _STREAM_ITERATOR_H 1
+
+#pragma GCC system_header
+
+#include <debug/debug.h>
+
+namespace std _GLIBCXX_VISIBILITY(default)
+{
+_GLIBCXX_BEGIN_NAMESPACE_VERSION
+
+ /**
+ * @addtogroup iterators
+ * @{
+ */
+
+ /// Provides input iterator semantics for streams.
+ template<typename _Tp, typename _CharT = char,
+ typename _Traits = char_traits<_CharT>, typename _Dist = ptrdiff_t>
+ class istream_iterator
+ : public iterator<input_iterator_tag, _Tp, _Dist, const _Tp*, const _Tp&>
+ {
+ public:
+ typedef _CharT char_type;
+ typedef _Traits traits_type;
+ typedef basic_istream<_CharT, _Traits> istream_type;
+
+ private:
+ istream_type* _M_stream;
+ _Tp _M_value;
+ bool _M_ok;
+
+ public:
+ /// Construct end of input stream iterator.
+ _GLIBCXX_CONSTEXPR istream_iterator()
+ : _M_stream(0), _M_value(), _M_ok(false) {}
+
+ /// Construct start of input stream iterator.
+ istream_iterator(istream_type& __s)
+ : _M_stream(&__s)
+ { _M_read(); }
+
+ istream_iterator(const istream_iterator& __obj)
+ : _M_stream(__obj._M_stream), _M_value(__obj._M_value),
+ _M_ok(__obj._M_ok)
+ { }
+
+ const _Tp&
+ operator*() const
+ {
+ __glibcxx_requires_cond(_M_ok,
+ _M_message(__gnu_debug::__msg_deref_istream)
+ ._M_iterator(*this));
+ return _M_value;
+ }
+
+ const _Tp*
+ operator->() const { return &(operator*()); }
+
+ istream_iterator&
+ operator++()
+ {
+ __glibcxx_requires_cond(_M_ok,
+ _M_message(__gnu_debug::__msg_inc_istream)
+ ._M_iterator(*this));
+ _M_read();
+ return *this;
+ }
+
+ istream_iterator
+ operator++(int)
+ {
+ __glibcxx_requires_cond(_M_ok,
+ _M_message(__gnu_debug::__msg_inc_istream)
+ ._M_iterator(*this));
+ istream_iterator __tmp = *this;
+ _M_read();
+ return __tmp;
+ }
+
+ bool
+ _M_equal(const istream_iterator& __x) const
+ { return (_M_ok == __x._M_ok) && (!_M_ok || _M_stream == __x._M_stream); }
+
+ private:
+ void
+ _M_read()
+ {
+ _M_ok = (_M_stream && *_M_stream) ? true : false;
+ if (_M_ok)
+ {
+ *_M_stream >> _M_value;
+ _M_ok = *_M_stream ? true : false;
+ }
+ }
+ };
+
+ /// Return true if x and y are both end or not end, or x and y are the same.
+ template<typename _Tp, typename _CharT, typename _Traits, typename _Dist>
+ inline bool
+ operator==(const istream_iterator<_Tp, _CharT, _Traits, _Dist>& __x,
+ const istream_iterator<_Tp, _CharT, _Traits, _Dist>& __y)
+ { return __x._M_equal(__y); }
+
+ /// Return false if x and y are both end or not end, or x and y are the same.
+ template <class _Tp, class _CharT, class _Traits, class _Dist>
+ inline bool
+ operator!=(const istream_iterator<_Tp, _CharT, _Traits, _Dist>& __x,
+ const istream_iterator<_Tp, _CharT, _Traits, _Dist>& __y)
+ { return !__x._M_equal(__y); }
+
+ /**
+ * @brief Provides output iterator semantics for streams.
+ *
+ * This class provides an iterator to write to an ostream. The type Tp is
+ * the only type written by this iterator and there must be an
+ * operator<<(Tp) defined.
+ *
+ * @tparam _Tp The type to write to the ostream.
+ * @tparam _CharT The ostream char_type.
+ * @tparam _Traits The ostream char_traits.
+ */
+ template<typename _Tp, typename _CharT = char,
+ typename _Traits = char_traits<_CharT> >
+ class ostream_iterator
+ : public iterator<output_iterator_tag, void, void, void, void>
+ {
+ public:
+ //@{
+ /// Public typedef
+ typedef _CharT char_type;
+ typedef _Traits traits_type;
+ typedef basic_ostream<_CharT, _Traits> ostream_type;
+ //@}
+
+ private:
+ ostream_type* _M_stream;
+ const _CharT* _M_string;
+
+ public:
+ /// Construct from an ostream.
+ ostream_iterator(ostream_type& __s) : _M_stream(&__s), _M_string(0) {}
+
+ /**
+ * Construct from an ostream.
+ *
+ * The delimiter string @a c is written to the stream after every Tp
+ * written to the stream. The delimiter is not copied, and thus must
+ * not be destroyed while this iterator is in use.
+ *
+ * @param __s Underlying ostream to write to.
+ * @param __c CharT delimiter string to insert.
+ */
+ ostream_iterator(ostream_type& __s, const _CharT* __c)
+ : _M_stream(&__s), _M_string(__c) { }
+
+ /// Copy constructor.
+ ostream_iterator(const ostream_iterator& __obj)
+ : _M_stream(__obj._M_stream), _M_string(__obj._M_string) { }
+
+ /// Writes @a value to underlying ostream using operator<<. If
+ /// constructed with delimiter string, writes delimiter to ostream.
+ ostream_iterator&
+ operator=(const _Tp& __value)
+ {
+ __glibcxx_requires_cond(_M_stream != 0,
+ _M_message(__gnu_debug::__msg_output_ostream)
+ ._M_iterator(*this));
+ *_M_stream << __value;
+ if (_M_string) *_M_stream << _M_string;
+ return *this;
+ }
+
+ ostream_iterator&
+ operator*()
+ { return *this; }
+
+ ostream_iterator&
+ operator++()
+ { return *this; }
+
+ ostream_iterator&
+ operator++(int)
+ { return *this; }
+ };
+
+ // @} group iterators
+
+_GLIBCXX_END_NAMESPACE_VERSION
+} // namespace
+
+#endif
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