68 lines
2.5 KiB
C++
68 lines
2.5 KiB
C++
// This is part of the iostream library, providing -*- C++ -*- input/output.
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// Copyright (C) 1992 Per Bothner.
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Library General Public
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// License as published by the Free Software Foundation; either
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// version 2 of the License, or (at your option) any later version.
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//
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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 GNU
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// Library General Public License for more details.
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//
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// You should have received a copy of the GNU Library General Public
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// License along with this library; if not, write to the Free
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// Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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//
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// $Id: indstream.h,v 1.2 1993/08/02 17:22:33 mycroft Exp $
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#ifndef _INDSTREAM_H
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#define _INDSTREAM_H
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#ifdef __GNUG__
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#pragma interface
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#endif
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#include <iostream.h>
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// An indirectbuf is one that forwards all of its I/O requests
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// to another streambuf.
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// All get-related requests are sent to get_stream().
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// All put-related requests are sent to put_stream().
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// An indirectbuf can be used to implement Common Lisp
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// synonym-streams and two-way-streams.
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//
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// class synonymbuf : public indirectbuf {
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// Symbol *sym;
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// synonymbuf(Symbol *s) { sym = s; }
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// virtual streambuf *lookup_stream(int mode) {
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// return coerce_to_streambuf(lookup_value(sym)); }
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// };
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class indirectbuf : public streambuf {
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protected:
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streambuf *_get_stream; // Optional cache for get_stream().
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streambuf *_put_stream; // Optional cache for put_stream().
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int _delete_flags;
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public:
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streambuf *get_stream()
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{ return _get_stream ? _get_stream : lookup_stream(ios::in); }
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streambuf *put_stream()
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{ return _put_stream ? _put_stream : lookup_stream(ios::out); }
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virtual streambuf *lookup_stream(int/*mode*/) { return NULL; } // ERROR!
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indirectbuf(streambuf *get=NULL, streambuf *put=NULL, int delete_mode=0);
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virtual ~indirectbuf();
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virtual int xsputn(const char* s, int n);
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virtual int xsgetn(char* s, int n);
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virtual int underflow();
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virtual int overflow(int c = EOF);
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virtual streampos seekoff(streamoff, _seek_dir, int mode=ios::in|ios::out);
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virtual streampos seekpos(streampos pos, int mode = ios::in|ios::out);
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virtual int sync();
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virtual int pbackfail(int c);
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};
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#endif /* !_INDSTREAM_H */
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