/home/archives/ucsd-psystem-xc/branch.0/branch.0/delta27403.167/lib/expression/smart_pointer.h

Go to the documentation of this file.

//
// UCSD p-System cross compiler
// Copyright (C) 2006 Peter Miller
//
// This program 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
// you option) any later version.
//
// This program 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 program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston MA 02111-1307,
// USA
//

#ifndef LIB_EXPRESSION_SMART_POINTER_H
#define LIB_EXPRESSION_SMART_POINTER_H

class expression; // forward

class expression_smart_pointer
{
public:
    virtual ~expression_smart_pointer();

    expression_smart_pointer();

    expression_smart_pointer(expression *arg);

    expression_smart_pointer(const expression_smart_pointer &);

    expression_smart_pointer &operator=(const expression_smart_pointer &);

    const expression *operator->() const { return ref; }

    expression *operator->() { return ref; }

    void null();

    bool is_null() const { return (ref == 0); }

    bool is_not_null() const { return (ref != 0); }

    bool
    operator==(const expression_smart_pointer &rhs)
        const
    {
        return (ref == rhs.ref);
    }

private:
    expression *ref;
};

#endif // LIB_EXPRESSION_SMART_POINTER_H

---