indstream.h
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上传日期:2009-02-17
资源大小:202k
文件大小:3k
源码类别:
STL
开发平台:
Visual C++
- /* This is part of libio/iostream, providing -*- C++ -*- input/output.
- Copyright (C) 1993 Free Software Foundation
- This file is part of the GNU IO 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, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
- As a special exception, if you link this library with files
- compiled with a GNU compiler to produce an executable, this does not 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.
- Written by Per Bothner (bothner@cygnus.com). */
- #ifndef _INDSTREAM_H
- #define _INDSTREAM_H
- #ifdef __GNUG__
- #pragma interface
- #endif
- #include <iostream.h>
- extern "C++" {
- // An indirectbuf is one that forwards all of its I/O requests
- // to another streambuf.
- // All get-related requests are sent to get_stream().
- // All put-related requests are sent to put_stream().
- // An indirectbuf can be used to implement Common Lisp
- // synonym-streams and two-way-streams.
- //
- // class synonymbuf : public indirectbuf {
- // Symbol *sym;
- // synonymbuf(Symbol *s) { sym = s; }
- // virtual streambuf *lookup_stream(int mode) {
- // return coerce_to_streambuf(lookup_value(sym)); }
- // };
- class indirectbuf : public streambuf {
- protected:
- streambuf *_get_stream; // Optional cache for get_stream().
- streambuf *_put_stream; // Optional cache for put_stream().
- int _delete_flags;
- public:
- streambuf *get_stream()
- { return _get_stream ? _get_stream : lookup_stream(ios::in); }
- streambuf *put_stream()
- { return _put_stream ? _put_stream : lookup_stream(ios::out); }
- virtual streambuf *lookup_stream(int/*mode*/) { return NULL; } // ERROR!
- indirectbuf(streambuf *get=NULL, streambuf *put=NULL, int delete_mode=0);
- virtual ~indirectbuf();
- virtual streamsize xsputn(const char* s, streamsize n);
- virtual streamsize xsgetn(char* s, streamsize n);
- virtual int underflow();
- virtual int uflow();
- virtual int overflow(int c = EOF);
- virtual streampos seekoff(streamoff, _seek_dir, int mode=ios::in|ios::out);
- virtual streampos seekpos(streampos pos, int mode = ios::in|ios::out);
- virtual int sync();
- virtual int pbackfail(int c);
- };
- } // extern "C++"
- #endif /* !_INDSTREAM_H */