QGIS API Documentation 3.30.0-'s-Hertogenbosch (f186b8efe0)
qgsoptionalexpression.h
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1/***************************************************************************
2 qgsoptionalexpression.h - QgsOptionalExpression
3
4 ---------------------
5 begin : 8.9.2016
6 copyright : (C) 2016 by Matthias Kuhn
8 ***************************************************************************
9 * *
10 * This program is free software; you can redistribute it and/or modify *
11 * it under the terms of the GNU General Public License as published by *
12 * the Free Software Foundation; either version 2 of the License, or *
13 * (at your option) any later version. *
14 * *
15 ***************************************************************************/
16#ifndef QGSOPTIONALEXPRESSION_H
17#define QGSOPTIONALEXPRESSION_H
18
19#include "qgsoptional.h"
20#include "qgsexpression.h"
21
22#include "qgis_core.h"
23
24
39class CORE_EXPORT QgsOptionalExpression : public QgsOptional<QgsExpression>
40{
41 public:
42
48
53 QgsOptionalExpression( const QgsExpression &expression );
54
58 QgsOptionalExpression( const QgsExpression &expression, bool enabled );
59
60
69 void writeXml( QDomElement &element ) const;
70
76 void readXml( const QDomElement &element );
77};
78
79
80#if defined(_MSC_VER)
81#ifndef SIP_RUN
82template class CORE_EXPORT QgsOptional<QgsExpression>;
83#endif
84#endif
85
86
87#endif // QGSOPTIONALEXPRESSION_H
Class for parsing and evaluation of expressions (formerly called "search strings").
An expression with an additional enabled flag.
QgsOptionalExpression()=default
Construct a default optional expression.
QgsOptional is a container for other classes and adds an additional enabled/disabled flag.
Definition: qgsoptional.h:37