InStream.h

/*
 *  $Id$
 *  InStream class interface
 *
 *  This file is part of OTAWA
 *  Copyright (c) 2004-07, IRIT UPS.
 * 
 *  OTAWA 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 of the License, or
 *  (at your option) any later version.
 *
 *  OTAWA 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 OTAWA; if not, write to the Free Software 
 *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
#ifndef ELM_IO_INSTREAM_H
#define ELM_IO_INSTREAM_H

#include <elm/string/CString.h>

namespace elm { namespace io {

// InStream class
class InStream {
public:
    static const int FAILED = -1;
    static const int ENDED = -2;
    virtual ~InStream(void) { };
    virtual int read(void *buffer, int size) = 0;
    virtual int read(void);
    virtual CString lastErrorMessage(void);
    
    static InStream& null;
};

// Standard IO streams
//extern InStream& stdin;

} } // io::elm

#endif // ELM_IO_INSTREAM_H