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QoreNullNode.h
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/* -*- mode: c++; indent-tabs-mode: nil -*- */
/*
QoreNullNode.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_QORENULLNODE_H
#define _QORE_QORENULLNODE_H
#include <qore/AbstractQoreNode.h>
class QoreNullNode : public UniqueValueQoreNode {
protected:
using SimpleValueQoreNode::evalImpl;
DLLLOCAL AbstractQoreNode *evalImpl(class ExceptionSink *xsink) const;
public:
DLLEXPORT QoreNullNode();
DLLEXPORT virtual ~QoreNullNode();
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 "NULL";
}
DLLLOCAL static qore_type_t getStaticTypeCode() {
return NT_NULL;
}
};
static inline bool is_null(const AbstractQoreNode *n)
{
// this is faster than a dynamic_cast<const QoreNullNode *> operation
return n && n->getType() == NT_NULL;
}
DLLEXPORT extern QoreNullNode Null;
static inline QoreNullNode *null()
{
return &Null;
}
#endif