265 lines
7.6 KiB
C++
265 lines
7.6 KiB
C++
// Streambuf iterators
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// Copyright (C) 1997-1999 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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// XXX Should specialize copy, find algorithms for streambuf iterators.
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#ifndef _CPP_BITS_SBUF_ITER_H
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#define _CPP_BITS_SBUF_ITER_H 1
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namespace std
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{
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template<typename _CharT, typename _Traits>
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class ostreambuf_iterator
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#if 0 // XXX this is standard:
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: public iterator<output_iterator_tag,_CharT,void,void,void>
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#else
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: public output_iterator
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#endif
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{
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public:
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// Types:
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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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inline
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ostreambuf_iterator(ostream_type& __s) throw ()
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: _M_sbuf(__s.rdbuf()), _M_failed(false) { }
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ostreambuf_iterator(streambuf_type* __s) throw ()
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: _M_sbuf(__s), _M_failed(false) { }
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ostreambuf_iterator&
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operator=(_CharT __c);
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ostreambuf_iterator&
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operator*() throw()
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{ return *this; }
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ostreambuf_iterator&
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operator++(int) throw()
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{ return *this; }
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ostreambuf_iterator&
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operator++() throw()
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{ return *this; }
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bool
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failed() const throw()
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{ return _M_failed; }
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private:
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streambuf_type* _M_sbuf;
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bool _M_failed;
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#if 0
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template<>
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friend char const*
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copy(char const* __first, char const* __last,
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ostreambuf_iterator<char,char_traits<char> > __to);
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template<>
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friend wchar_t const*
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copy(wchar_t const* __first, wchar_t const* __last,
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ostreambuf_iterator<wchar_t,char_traits<wchar_t> > __to);
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#endif
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};
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template<typename _CharT, typename _Traits>
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inline ostreambuf_iterator<_CharT, _Traits>&
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ostreambuf_iterator<_CharT, _Traits>::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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#if 0
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// Optimized specializations of standard algorithms
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// These are specialized only for standard types
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// (with no unbound arguments) to avoid creating
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// overload problems with user specializations.
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template<>
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char const*
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copy(char const* __first, char const* __last,
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ostreambuf_iterator<char,char_traits<char> > __to)
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{
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if (!__to._M_failed)
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__to._M_sbuf->sputn(__first, __last-__first);
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return __last;
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}
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template<>
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wchar_t const*
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copy(wchar_t const* __first, wchar_t const* __last,
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ostreambuf_iterator<whar_t,char_traits<wchar_t> > __to)
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{
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if (!__to._M_failed)
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__to._M_sbuf->sputn(__first, __last-__first);
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return __last;
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}
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#endif
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// 24.5.3 Template class istreambuf_iterator
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template<class _CharT, class _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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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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// Non-standard Types:
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typedef istreambuf_iterator<_CharT, _Traits> __istreambufiter_type;
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istreambuf_iterator() throw()
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: _M_istreambuf(NULL), _M_c(-2) { }
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istreambuf_iterator(istream_type& __s) throw()
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: _M_istreambuf(__s.rdbuf()), _M_c(-2) { }
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istreambuf_iterator(streambuf_type* __s) throw()
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: _M_istreambuf(__s), _M_c(-2) { }
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// NB: This should really have an int_type return
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// value, so "end of stream" postion can be checked without
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// hacking.
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char_type
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operator*() const
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{
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// The result of operator*() on an end of stream is undefined.
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char_type __retval;
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if (_M_istreambuf && _M_c != static_cast<int_type>(-2))
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__retval = _M_c;
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else if (_M_istreambuf)
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__retval = traits_type::to_char_type(_M_istreambuf->sgetc());
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else
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__retval = static_cast<char_type>(traits_type::eof());
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return __retval;
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}
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__istreambufiter_type&
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operator++()
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{
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if (_M_istreambuf)
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_M_istreambuf->sbumpc();
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_M_c = -2;
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return *this;
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}
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#ifdef _GLIBCPP_RESOLVE_LIB_DEFECTS
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// 14882 says return a proxy object. It should be a const
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// proxy object, but since this class is not mandated, it
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// should allow this signature:
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const __istreambufiter_type
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operator++(int)
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{
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if (_M_istreambuf)
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_M_c = _M_istreambuf->sbumpc();
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return *this;
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}
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#endif
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bool
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equal(const __istreambufiter_type& __b)
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{
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int_type __eof = traits_type::eof();
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bool __thiseof = !_M_istreambuf || _M_istreambuf->sgetc() == __eof;
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bool __beof = !__b._M_istreambuf
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|| __b._M_istreambuf->sgetc() == __eof;
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return (__thiseof && __beof || (!__thiseof && !__beof));
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}
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#ifdef _GLIBCPP_RESOLVE_LIB_DEFECTS
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// 110 istreambuf_iterator::equal not const
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// NB: there is also number 111 pending on this function.
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bool
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equal(const __istreambufiter_type& __b) const
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{
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int_type __eof = traits_type::eof();
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bool __thiseof = !_M_istreambuf || _M_istreambuf->sgetc() == __eof;
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bool __beof = !__b._M_istreambuf
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|| __b._M_istreambuf->sgetc() == __eof;
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return (__thiseof && __beof || (!__thiseof && !__beof));
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}
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#endif
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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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streambuf_type* _M_istreambuf;
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int_type _M_c;
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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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} // std::
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#endif /* _CPP_BITS_SBUF_ITER_H */
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