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QoreNothingNode.h
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/* -*- mode: c++; indent-tabs-mode: nil -*- */
/*
QoreNothingNode.h
Qore Programming Language
Copyright 2003 - 2013 David Nichols
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef _QORE_QORENOTHINGNODE_H
#define _QORE_QORENOTHINGNODE_H
#include <qore/AbstractQoreNode.h>
class QoreNothingNode : public UniqueValueQoreNode {
protected:
using SimpleValueQoreNode::evalImpl;
DLLLOCAL AbstractQoreNode *evalImpl(ExceptionSink *xsink) const;
public:
DLLEXPORT QoreNothingNode();
DLLEXPORT virtual ~QoreNothingNode();
DLLEXPORT virtual int getAsString(QoreString &str, int foff, class ExceptionSink *xsink) const;
DLLEXPORT virtual QoreString *getAsString(bool &del, int foff, class ExceptionSink *xsink) const;
DLLEXPORT virtual bool is_equal_soft(const AbstractQoreNode *v, ExceptionSink *xsink) const;
DLLEXPORT virtual bool is_equal_hard(const AbstractQoreNode *v, ExceptionSink *xsink) const;
DLLEXPORT virtual const char *getTypeName() const;
DLLLOCAL virtual AbstractQoreNode *parseInit(LocalVar *oflag, int pflag, int &lvids, const QoreTypeInfo *&typeInfo);
DLLLOCAL static const char *getStaticTypeName() {
return "nothing";
}
DLLLOCAL static qore_type_t getStaticTypeCode() {
return NT_NOTHING;
}
};
DLLEXPORT extern QoreNothingNode Nothing;
static inline QoreNothingNode *nothing() {
return &Nothing;
}
#endif