259 lines
7.8 KiB
C++
259 lines
7.8 KiB
C++
// Streambuf iterators
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// Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004
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// Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 2, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License along
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// with this library; see the file COPYING. If not, write to the Free
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// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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// USA.
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// As a special exception, you may use this file as part of a free software
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// library without restriction. Specifically, if other files instantiate
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// templates or use macros or inline functions from this file, or you compile
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// this file and link it with other files to produce an executable, this
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// file does not by itself cause the resulting executable to be covered by
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// the GNU General Public License. This exception does not however
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// invalidate any other reasons why the executable file might be covered by
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// the GNU General Public License.
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/** @file streambuf_iterator.h
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* This is an internal header file, included by other library headers.
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* You should not attempt to use it directly.
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*/
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#ifndef _STREAMBUF_ITERATOR_H
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#define _STREAMBUF_ITERATOR_H 1
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#pragma GCC system_header
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#include <streambuf>
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#include <debug/debug.h>
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// NB: Should specialize copy, find algorithms for streambuf iterators.
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namespace std
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{
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// 24.5.3 Template class istreambuf_iterator
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/// Provides input iterator semantics for streambufs.
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template<typename _CharT, typename _Traits>
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class istreambuf_iterator
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: public iterator<input_iterator_tag, _CharT, typename _Traits::off_type,
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_CharT*, _CharT&>
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{
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public:
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// Types:
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//@{
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/// Public typedefs
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typedef _CharT char_type;
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typedef _Traits traits_type;
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typedef typename _Traits::int_type int_type;
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typedef basic_streambuf<_CharT, _Traits> streambuf_type;
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typedef basic_istream<_CharT, _Traits> istream_type;
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//@}
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private:
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// 24.5.3 istreambuf_iterator
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// p 1
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// If the end of stream is reached (streambuf_type::sgetc()
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// returns traits_type::eof()), the iterator becomes equal to
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// the "end of stream" iterator value.
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// NB: This implementation assumes the "end of stream" value
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// is EOF, or -1.
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mutable streambuf_type* _M_sbuf;
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int_type _M_c;
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public:
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/// Construct end of input stream iterator.
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istreambuf_iterator() throw()
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: _M_sbuf(0), _M_c(traits_type::eof()) { }
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/// Construct start of input stream iterator.
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istreambuf_iterator(istream_type& __s) throw()
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: _M_sbuf(__s.rdbuf()), _M_c(traits_type::eof()) { }
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/// Construct start of streambuf iterator.
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istreambuf_iterator(streambuf_type* __s) throw()
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: _M_sbuf(__s), _M_c(traits_type::eof()) { }
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/// Return the current character pointed to by iterator. This returns
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/// streambuf.sgetc(). It cannot be assigned. NB: The result of
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/// operator*() on an end of stream is undefined.
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char_type
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operator*() const
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{
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#ifdef _GLIBCXX_DEBUG_PEDANTIC
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// Dereferencing a past-the-end istreambuf_iterator is a
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// libstdc++ extension
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__glibcxx_requires_cond(!_M_at_eof(),
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_M_message(__gnu_debug::__msg_deref_istreambuf)
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._M_iterator(*this));
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#endif
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return traits_type::to_char_type(_M_get());
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}
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/// Advance the iterator. Calls streambuf.sbumpc().
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istreambuf_iterator&
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operator++()
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{
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__glibcxx_requires_cond(!_M_at_eof(),
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_M_message(__gnu_debug::__msg_inc_istreambuf)
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._M_iterator(*this));
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const int_type __eof = traits_type::eof();
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if (_M_sbuf && traits_type::eq_int_type(_M_sbuf->sbumpc(), __eof))
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_M_sbuf = 0;
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else
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_M_c = __eof;
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return *this;
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}
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/// Advance the iterator. Calls streambuf.sbumpc().
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istreambuf_iterator
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operator++(int)
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{
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__glibcxx_requires_cond(!_M_at_eof(),
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_M_message(__gnu_debug::__msg_inc_istreambuf)
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._M_iterator(*this));
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const int_type __eof = traits_type::eof();
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istreambuf_iterator __old = *this;
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if (_M_sbuf
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&& traits_type::eq_int_type((__old._M_c = _M_sbuf->sbumpc()),
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__eof))
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_M_sbuf = 0;
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else
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_M_c = __eof;
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return __old;
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}
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// _GLIBCXX_RESOLVE_LIB_DEFECTS
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// 110 istreambuf_iterator::equal not const
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// NB: there is also number 111 (NAD, Future) pending on this function.
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/// Return true both iterators are end or both are not end.
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bool
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equal(const istreambuf_iterator& __b) const
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{
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const bool __thiseof = _M_at_eof();
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const bool __beof = __b._M_at_eof();
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return (__thiseof && __beof || (!__thiseof && !__beof));
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}
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private:
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int_type
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_M_get() const
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{
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const int_type __eof = traits_type::eof();
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int_type __ret = __eof;
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if (_M_sbuf)
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{
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if (!traits_type::eq_int_type(_M_c, __eof))
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__ret = _M_c;
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else if (traits_type::eq_int_type((__ret = _M_sbuf->sgetc()),
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__eof))
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_M_sbuf = 0;
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}
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return __ret;
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}
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bool
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_M_at_eof() const
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{
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const int_type __eof = traits_type::eof();
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return traits_type::eq_int_type(_M_get(), __eof);
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}
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};
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template<typename _CharT, typename _Traits>
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inline bool
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operator==(const istreambuf_iterator<_CharT, _Traits>& __a,
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const istreambuf_iterator<_CharT, _Traits>& __b)
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{ return __a.equal(__b); }
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template<typename _CharT, typename _Traits>
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inline bool
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operator!=(const istreambuf_iterator<_CharT, _Traits>& __a,
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const istreambuf_iterator<_CharT, _Traits>& __b)
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{ return !__a.equal(__b); }
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/// Provides output iterator semantics for streambufs.
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template<typename _CharT, typename _Traits>
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class ostreambuf_iterator
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: public iterator<output_iterator_tag, void, void, void, void>
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{
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public:
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// Types:
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//@{
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/// Public typedefs
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typedef _CharT char_type;
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typedef _Traits traits_type;
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typedef basic_streambuf<_CharT, _Traits> streambuf_type;
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typedef basic_ostream<_CharT, _Traits> ostream_type;
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//@}
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private:
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streambuf_type* _M_sbuf;
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bool _M_failed;
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public:
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/// Construct output iterator from ostream.
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ostreambuf_iterator(ostream_type& __s) throw ()
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: _M_sbuf(__s.rdbuf()), _M_failed(!_M_sbuf) { }
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/// Construct output iterator from streambuf.
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ostreambuf_iterator(streambuf_type* __s) throw ()
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: _M_sbuf(__s), _M_failed(!_M_sbuf) { }
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/// Write character to streambuf. Calls streambuf.sputc().
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ostreambuf_iterator&
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operator=(_CharT __c)
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{
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if (!_M_failed &&
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_Traits::eq_int_type(_M_sbuf->sputc(__c), _Traits::eof()))
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_M_failed = true;
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return *this;
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}
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/// Return *this.
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ostreambuf_iterator&
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operator*()
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{ return *this; }
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/// Return *this.
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ostreambuf_iterator&
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operator++(int)
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{ return *this; }
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/// Return *this.
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ostreambuf_iterator&
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operator++()
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{ return *this; }
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/// Return true if previous operator=() failed.
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bool
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failed() const throw()
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{ return _M_failed; }
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ostreambuf_iterator&
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_M_put(const _CharT* __ws, streamsize __len)
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{
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if (__builtin_expect(!_M_failed, true)
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&& __builtin_expect(this->_M_sbuf->sputn(__ws, __len) != __len,
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false))
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_M_failed = true;
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return *this;
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}
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};
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} // namespace std
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#endif
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