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include
qore
QoreNodeEvalOptionalRefHolder.h
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/* -*- mode: c++; indent-tabs-mode: nil -*- */
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/*
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QoreNodeEvalOptionalRefHolder.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_QORENODEEVALOPTIONALREFHOLDER_H
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#define _QORE_QORENODEEVALOPTIONALREFHOLDER_H
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class
QoreNodeEvalOptionalRefHolder
{
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private
:
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AbstractQoreNode
*val;
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ExceptionSink
*xsink;
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bool
needs_deref;
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DLLLOCAL
void
discard_intern() {
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if
(needs_deref && val)
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val->
deref
(xsink);
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}
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DLLLOCAL
QoreNodeEvalOptionalRefHolder
(
const
QoreNodeEvalOptionalRefHolder
&);
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DLLLOCAL QoreNodeEvalOptionalRefHolder& operator=(
const
QoreNodeEvalOptionalRefHolder&);
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DLLLOCAL
void
*
operator
new
(size_t);
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public
:
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DLLLOCAL
QoreNodeEvalOptionalRefHolder
(
ExceptionSink
*n_xsink) : val(0), xsink(n_xsink), needs_deref(false) {
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}
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DLLLOCAL
QoreNodeEvalOptionalRefHolder
(
const
AbstractQoreNode
*exp,
ExceptionSink
*n_xsink) : xsink(n_xsink) {
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if
(exp)
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val = exp->
eval
(needs_deref, xsink);
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else
{
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val = 0;
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needs_deref =
false
;
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}
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}
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DLLLOCAL
~QoreNodeEvalOptionalRefHolder
() {
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discard_intern();
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}
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DLLLOCAL
void
discard
() {
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discard_intern();
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needs_deref =
false
;
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val = 0;
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}
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DLLLOCAL
void
assign
(
bool
n_needs_deref,
AbstractQoreNode
*n_val) {
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discard_intern();
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needs_deref = n_needs_deref;
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val = n_val;
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}
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DLLLOCAL
AbstractQoreNode
*
getReferencedValue
() {
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if
(needs_deref)
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needs_deref =
false
;
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else
if
(val)
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val->
ref
();
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return
val;
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}
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DLLLOCAL
const
AbstractQoreNode
*
operator->
()
const
{
return
val; }
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DLLLOCAL
const
AbstractQoreNode
*
operator*
()
const
{
return
val; }
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DLLLOCAL
operator
bool()
const
{
return
val != 0; }
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DLLLOCAL
bool
isTemp
()
const
{
return
needs_deref; }
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};
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#endif