NullAddress.hh

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/*
    Copyright (c) 2002-2009 Tampere University.
 
    This file is part of TTA-Based Codesign Environment (TCE).
 
    Permission is hereby granted, free of charge, to any person obtaining a
    copy of this software and associated documentation files (the "Software"),
    to deal in the Software without restriction, including without limitation
    the rights to use, copy, modify, merge, publish, distribute, sublicense,
    and/or sell copies of the Software, and to permit persons to whom the
    Software is furnished to do so, subject to the following conditions:
 
    The above copyright notice and this permission notice shall be included in
    all copies or substantial portions of the Software.
 
    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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/**
 * @file NullAddress.hh
 *
 * Declaration of NullAddress class.
 *
 * @author Ari Metsähalme 2005 (ari.metsahalme-no.spam-tut.fi)
 * @note rating: red
 */
 
#ifndef TTA_NULL_ADDRESS_HH
#define TTA_NULL_ADDRESS_HH
 
#include "Address.hh"
 
namespace TTAProgram {
 
/**
 * A singleton class that represents a null address.
 *
 * Calling any method causes the program to abort.
 */
class NullAddress : public Address {
public:
    virtual ~NullAddress();
    static NullAddress& instance();
 
    UIntWord location() const;
    const TTAMachine::AddressSpace& space() const;
 
protected:
    NullAddress();
 
private:
    /// Copying not allowed.
    NullAddress(const NullAddress&);
    /// Assignment not allowed.
    NullAddress& operator=(const NullAddress&);
 
    static NullAddress instance_;
};
 
}
 
#endif