NullInstructionField.cc

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/*
    Copyright (c) 2002-2009 Tampere University.
 
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/**
 * @file NullInstructionField.cc
 *
 * Implementation of NullInstructionField class.
 *
 * @author Lasse Laasonen 2005 (lasse.laasonen-no.spam-tut.fi)
 * @note rating: red
 */
 
#include <string>
 
#include "NullInstructionField.hh"
#include "Application.hh"
 
using std::string;
 
NullInstructionField NullInstructionField::instance_;
 
/**
 * The constructor.
 */
NullInstructionField::NullInstructionField() : InstructionField(NULL) {
}
 
 
/**
 * The destructor.
 */
NullInstructionField::~NullInstructionField() {
}
 
 
/**
 * Returns the only instance of NullInstructionField.
 *
 * @return The only instance of NullInstructionField.
 */
NullInstructionField&
NullInstructionField::instance() {
    return instance_;
}
 
 
/**
 * Always returns 0.
 *
 * @return 0.
 */
int
NullInstructionField::childFieldCount() const {
    return 0;
}
 
 
/**
 * Always throws OutOfRange exception.
 *
 * @return Never returns.
 * @exception OutOfRange Always thrown.
 */
InstructionField&
NullInstructionField::childField(int) const {
    const string procName = "NullInstructionField::childField";
    throw OutOfRange(__FILE__, __LINE__, procName);
}
 
/**
 * Always returns 0.
 *
 * @return 0.
 */
int
NullInstructionField::width() const {
    return 0;
}