QgsVariantUtils Class Reference

Contains utility functions for working with QVariants and QVariant types. More...

#include <qgsvariantutils.h>

Static Public Member Functions
static QVariant	createNullVariant (QMetaType::Type metaType)
	Helper method to properly create a null QVariant from a metaType Returns the created QVariant.
static bool	isNull (const QVariant &variant, bool silenceNullWarnings=false)
	Returns true if the specified variant should be considered a NULL value.
static QVariant::Type	metaTypeToVariantType (QMetaType::Type metaType)
	Converts a QMetaType::Type to a QVariant::Type.
static QString	typeToDisplayString (QMetaType::Type type, QMetaType::Type subType=QMetaType::Type::UnknownType)
	Returns a user-friendly translated string representing a QVariant type.
static Q_DECL_DEPRECATED QString	typeToDisplayString (QVariant::Type type, QVariant::Type subType=QVariant::Type::Invalid)
	Returns a user-friendly translated string representing a QVariant type.
static QMetaType::Type	variantTypeToMetaType (QVariant::Type variantType)
	Converts a QVariant::Type to a QMetaType::Type.

Detailed Description

Contains utility functions for working with QVariants and QVariant types.

Since

QGIS 3.24

Definition at line 31 of file qgsvariantutils.h.

Member Function Documentation

createNullVariant()

QVariant QgsVariantUtils::createNullVariant ( QMetaType::Type  metaType )

static

Helper method to properly create a null QVariant from a metaType Returns the created QVariant.

Definition at line 599 of file qgsvariantutils.cpp.

isNull()

bool QgsVariantUtils::isNull ( const QVariant &  variant, bool  silenceNullWarnings = false  )

static

Returns true if the specified variant should be considered a NULL value.

This method is more rigorous vs QVariant::isNull(), which will return false on newer Qt versions for tests like QVariant( QDateTime() ).isNull().

Since

QGIS 3.28

Definition at line 169 of file qgsvariantutils.cpp.

metaTypeToVariantType()

QVariant::Type QgsVariantUtils::metaTypeToVariantType ( QMetaType::Type  metaType )

static

Converts a QMetaType::Type to a QVariant::Type.

Warning

Not all QMetaType::Type values can be represented as a QVariant::Type. If no conversion is possible, QVariant::UserType will be returned. Some conversions are lossy, in that the QVariant::Type cannot represent the full range of values possible in QMetaType::Type. In these cases the returned type will be an "expanded" type capable of storing the full range of values possible in the original type.

See also

variantTypeToMetaType()

Since

QGIS 3.36

Definition at line 479 of file qgsvariantutils.cpp.

typeToDisplayString() [1/2]

QString QgsVariantUtils::typeToDisplayString ( QMetaType::Type  type, QMetaType::Type  subType = QMetaType::Type::UnknownType  )

static

Returns a user-friendly translated string representing a QVariant type.

The optional subType can be used to specify the type of variant list or map values.

Definition at line 37 of file qgsvariantutils.cpp.

typeToDisplayString() [2/2]

QString QgsVariantUtils::typeToDisplayString ( QVariant::Type  type, QVariant::Type  subType = QVariant::Type::Invalid  )

static

Returns a user-friendly translated string representing a QVariant type.

The optional subType can be used to specify the type of variant list or map values.

Deprecated:

since QGIS 3.38, use the method with a QMetaType::Type argument instead

Definition at line 164 of file qgsvariantutils.cpp.

variantTypeToMetaType()

QMetaType::Type QgsVariantUtils::variantTypeToMetaType ( QVariant::Type  variantType )

static

Converts a QVariant::Type to a QMetaType::Type.

See also

metaTypeToVariantType()

Since

QGIS 3.36

Definition at line 473 of file qgsvariantutils.cpp.

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The documentation for this class was generated from the following files:

• /build/qgis-3.39.0+git20240630+52f98f8c831+99sid/src/core/qgsvariantutils.h
• /build/qgis-3.39.0+git20240630+52f98f8c831+99sid/src/core/qgsvariantutils.cpp