QGIS API Documentation 3.40.0-Bratislava (b56115d8743)
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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
38class CORE_EXPORT QgsOptionalExpression : public QgsOptional<QgsExpression>
39{
40 public:
41
47
52 QgsOptionalExpression( const QgsExpression &expression );
53
57 QgsOptionalExpression( const QgsExpression &expression, bool enabled );
58
59
67 void writeXml( QDomElement &element ) const;
68
73 void readXml( const QDomElement &element );
74};
75
76
77#if defined(_MSC_VER)
78#ifndef SIP_RUN
79template class CORE_EXPORT QgsOptional<QgsExpression>;
80#endif
81#endif
82
83
84#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:36