NullInstructionField.hh

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/*
    Copyright (c) 2002-2009 Tampere University.
 
    This file is part of TTA-Based Codesign Environment (TCE).
 
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/**
 * @file NullInstructionField.hh
 *
 * Declaration of NullInstructionField class.
 *
 * @author Lasse Laasonen 2005 (lasse.laasonen-no.spam-tut.fi)
 * @note rating: red
 */
 
#ifndef TTA_NULL_INSTRUCTION_FIELD_HH
#define TTA_NULL_INSTRUCTION_FIELD_HH
 
#include "InstructionField.hh"
 
/**
 * A null version of instruction field.
 */
class NullInstructionField : public InstructionField {
public:
    static NullInstructionField& instance();
 
    virtual int childFieldCount() const;
    virtual InstructionField& childField(int position) const;
    virtual int width() const;
 
private:
    NullInstructionField();
    virtual ~NullInstructionField();
 
    /// The only instance.
    static NullInstructionField instance_;
};
 
#endif