NullSourceField.hh

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/*
    Copyright (c) 2002-2009 Tampere University.
 
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/**
 * @file NullSourceField.hh
 *
 * Declaration of NullSourceField class.
 *
 * @author Lasse Laasonen 2005 (lasse.laasonen-no.spam-tut.fi)
 * @note rating: red
 */
 
#ifndef TTA_NULL_SOURCE_FIELD_HH
#define TTA_NULL_SOURCE_FIELD_HH
 
#include "SourceField.hh"
 
class MoveSlot;
class BinaryEncoding;
 
/**
 * A null version of SourceField class.
 */
class NullSourceField : public SourceField {
public:
    static NullSourceField& instance();
 
private:
    NullSourceField();
    virtual ~NullSourceField();
 
    /// The only instance.
    static NullSourceField instance_;
    /// The parent move slot.
    static MoveSlot moveSlot_;
    /// The parent binary encoding.
    static BinaryEncoding bem_;
};
 
#endif