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Annotation of GNUtools/libg++/libio/indstream.h, revision 1.1

1.1     ! root        1: /* This is part of libio/iostream, providing -*- C++ -*- input/output.
        !             2: Copyright (C) 1993 Free Software Foundation
        !             3: 
        !             4: This file is part of the GNU IO Library.  This library is free
        !             5: software; you can redistribute it and/or modify it under the
        !             6: terms of the GNU General Public License as published by the
        !             7: Free Software Foundation; either version 2, or (at your option)
        !             8: any later version.
        !             9: 
        !            10: This library is distributed in the hope that it will be useful,
        !            11: but WITHOUT ANY WARRANTY; without even the implied warranty of
        !            12: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
        !            13: GNU General Public License for more details.
        !            14: 
        !            15: You should have received a copy of the GNU General Public License
        !            16: along with GNU CC; see the file COPYING.  If not, write to
        !            17: the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
        !            18: 
        !            19: As a special exception, if you link this library with files
        !            20: compiled with a GNU compiler to produce an executable, this does not cause
        !            21: the resulting executable to be covered by the GNU General Public License.
        !            22: This exception does not however invalidate any other reasons why
        !            23: the executable file might be covered by the GNU General Public License.
        !            24: 
        !            25: Written by Per Bothner ([email protected]). */
        !            26: 
        !            27: #ifndef _INDSTREAM_H
        !            28: #define _INDSTREAM_H
        !            29: 
        !            30: #ifdef __GNUG__
        !            31: #pragma interface
        !            32: #pragma cplusplus
        !            33: #endif
        !            34: 
        !            35: #include <iostream.h>
        !            36: 
        !            37: // An indirectbuf is one that forwards all of its I/O requests
        !            38: // to another streambuf.
        !            39: // All get-related requests are sent to get_stream().
        !            40: // All put-related requests are sent to put_stream().
        !            41: 
        !            42: // An indirectbuf can be used to implement Common Lisp
        !            43: // synonym-streams and two-way-streams.
        !            44: //
        !            45: // class synonymbuf : public indirectbuf {
        !            46: //    Symbol *sym;
        !            47: //    synonymbuf(Symbol *s) { sym = s; }
        !            48: //    virtual streambuf *lookup_stream(int mode) {
        !            49: //        return coerce_to_streambuf(lookup_value(sym)); }
        !            50: // };
        !            51: 
        !            52: class indirectbuf : public streambuf {
        !            53:   protected:
        !            54:     streambuf *_get_stream;  // Optional cache for get_stream().
        !            55:     streambuf *_put_stream;  // Optional cache for put_stream().
        !            56:     int _delete_flags;
        !            57:   public:
        !            58:     streambuf *get_stream()
        !            59:        { return _get_stream ? _get_stream : lookup_stream(ios::in); }
        !            60:     streambuf *put_stream()
        !            61:        { return _put_stream ? _put_stream : lookup_stream(ios::out); }
        !            62:     virtual streambuf *lookup_stream(int/*mode*/) { return NULL; } // ERROR!
        !            63:     indirectbuf(streambuf *get=NULL, streambuf *put=NULL, int delete_mode=0);
        !            64:     virtual ~indirectbuf();
        !            65:     virtual int xsputn(const char* s, int n);
        !            66:     virtual int xsgetn(char* s, int n);
        !            67:     virtual int underflow();
        !            68:     virtual int overflow(int c = EOF);
        !            69:     virtual streampos seekoff(streamoff, _seek_dir, int mode=ios::in|ios::out);
        !            70:     virtual streampos seekpos(streampos pos, int mode = ios::in|ios::out);
        !            71:     virtual int sync();
        !            72:     virtual int pbackfail(int c);
        !            73: };
        !            74: 
        !            75: #endif /* !_INDSTREAM_H */

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