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include
qore
QoreNullNode.h
Go to the documentation of this file.
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/* -*- mode: c++; indent-tabs-mode: nil -*- */
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/*
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QoreNullNode.h
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Qore Programming Language
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Copyright 2003 - 2013 David Nichols
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef _QORE_QORENULLNODE_H
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#define _QORE_QORENULLNODE_H
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#include <qore/AbstractQoreNode.h>
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class
QoreNullNode
:
public
UniqueValueQoreNode
{
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protected
:
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using
SimpleValueQoreNode::evalImpl
;
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DLLLOCAL
AbstractQoreNode
*
evalImpl
(
class
ExceptionSink
*xsink)
const
;
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public
:
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DLLEXPORT
QoreNullNode
();
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DLLEXPORT
virtual
~QoreNullNode();
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DLLEXPORT
virtual
int
getAsString
(
QoreString
&str,
int
foff,
class
ExceptionSink
*xsink)
const
;
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DLLEXPORT
virtual
QoreString
*
getAsString
(
bool
&del,
int
foff,
class
ExceptionSink
*xsink)
const
;
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DLLEXPORT
virtual
bool
is_equal_soft
(
const
AbstractQoreNode
*v,
ExceptionSink
*xsink)
const
;
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DLLEXPORT
virtual
bool
is_equal_hard
(
const
AbstractQoreNode
*v,
ExceptionSink
*xsink)
const
;
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DLLEXPORT
virtual
const
char
*
getTypeName
()
const
;
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DLLLOCAL
virtual
AbstractQoreNode
*
parseInit
(LocalVar *oflag,
int
pflag,
int
&lvids,
const
QoreTypeInfo *&typeInfo);
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DLLLOCAL
static
const
char
*
getStaticTypeName
() {
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return
"NULL"
;
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}
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DLLLOCAL
static
qore_type_t
getStaticTypeCode
() {
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return
NT_NULL
;
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}
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};
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static
inline
bool
is_null
(
const
AbstractQoreNode
*n)
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{
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// this is faster than a dynamic_cast<const QoreNullNode *> operation
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return
n && n->
getType
() ==
NT_NULL
;
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}
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DLLEXPORT
extern
QoreNullNode
Null
;
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static
inline
QoreNullNode
*
null
()
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{
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return
&
Null
;
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}
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#endif