qgsexpressioncontext.h File Reference

#include "qgis_core.h"
#include "qgis_sip.h"
#include <QVariant>
#include <QHash>
#include <QString>
#include <QStringList>
#include <QSet>
#include "qgsexpressionfunction.h"
#include "qgsfeature.h"

Include dependency graph for qgsexpressioncontext.h:

Go to the source code of this file.

Classes
class	QgsExpressionContext
	Expression contexts are used to encapsulate the parameters around which a QgsExpression should be evaluated. QgsExpressions can then utilize the information stored within a context to contextualise their evaluated result. A QgsExpressionContext consists of a stack of QgsExpressionContextScope objects, where scopes added later to the stack will override conflicting variables and functions from scopes lower in the stack. More...
class	QgsExpressionContextScope
	Single scope for storing variables and functions for use within a QgsExpressionContext. Examples include a project's scope, which could contain information about the current project such as the project file's location. QgsExpressionContextScope can encapsulate both variables (static values) and functions(which are calculated only when an expression is evaluated). More...
class	QgsScopedExpressionFunction
	Expression function for use within a QgsExpressionContextScope. This differs from a standard QgsExpression::Function in that it requires an implemented clone() method. More...
struct	QgsExpressionContextScope::StaticVariable
	Single variable definition for use within a QgsExpressionContextScope. More...