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Diffstat (limited to 'libstdc++/include/bits/stream_iterator.h')
| -rw-r--r-- | libstdc++/include/bits/stream_iterator.h | 216 |
1 files changed, 216 insertions, 0 deletions
diff --git a/libstdc++/include/bits/stream_iterator.h b/libstdc++/include/bits/stream_iterator.h new file mode 100644 index 0000000..ce3e675 --- /dev/null +++ b/libstdc++/include/bits/stream_iterator.h @@ -0,0 +1,216 @@ +// Stream iterators + +// Copyright (C) 2001, 2004, 2005 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 2, 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. + +// You should have received a copy of the GNU General Public License along +// with this library; see the file COPYING. If not, write to the Free +// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, +// USA. + +// As a special exception, you may use this file as part of a free software +// library without restriction. Specifically, if other files instantiate +// templates or use macros or inline functions from this file, or you compile +// this file and link it with other files to produce an executable, this +// file does not by itself cause the resulting executable to be covered by +// the GNU General Public License. This exception does not however +// invalidate any other reasons why the executable file might be covered by +// the GNU General Public License. + +/** @file stream_iterator.h + * This is an internal header file, included by other library headers. + * You should not attempt to use it directly. + */ + +#ifndef _STREAM_ITERATOR_H +#define _STREAM_ITERATOR_H 1 + +#pragma GCC system_header + +#include <debug/debug.h> + +_GLIBCXX_BEGIN_NAMESPACE(std) + + /// 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. + 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. + * + * @param Tp The type to write to the ostream. + * @param CharT The ostream char_type. + * @param 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; } + }; + +_GLIBCXX_END_NAMESPACE + +#endif |
