UA_Variant Struct Reference

Variants store (arrays of) any data type. Either they provide a pointer to the data in memory, or functions from which the data can be accessed. Variants are replaced together with the data they store (exception: use a data source). More...

#include <ua_types.h>

Public Types
enum	{ UA_VARIANT_DATA, UA_VARIANT_DATA_NODELETE }
Data Fields
const UA_DataType *	type
enum UA_Variant:: { ... }	storageType
UA_Int32	arrayLength
	the number of elements in the data-pointer
void *	data
	points to the scalar or array data
UA_Int32	arrayDimensionsSize
	the number of dimensions the data-array has
UA_Int32 *	arrayDimensions
	the length of each dimension of the data-array

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Detailed Description

Variants store (arrays of) any data type. Either they provide a pointer to the data in memory, or functions from which the data can be accessed. Variants are replaced together with the data they store (exception: use a data source).

Variant semantics:

• arrayLength = -1 && data == NULL: empty variant
• arrayLength = -1 && data == !NULL: variant holds a single element (a scalar)
• arrayLength >= 0: variant holds an array of the appropriate length data can be NULL if arrayLength == 0

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Member Enumeration Documentation

anonymous enum

Enumerator:

UA_VARIANT_DATA	The data is "owned" by this variant (copied and deleted together)
UA_VARIANT_DATA_NODELETE	The data is "borrowed" by the variant and shall not be deleted at the end of this variant's lifecycle. It is not possible to overwrite borrowed data due to concurrent access. Use a custom datasource with a mutex.

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Field Documentation

UA_Int32* UA_Variant::arrayDimensions

the length of each dimension of the data-array

UA_Int32 UA_Variant::arrayDimensionsSize

the number of dimensions the data-array has

UA_Int32 UA_Variant::arrayLength

the number of elements in the data-pointer

void* UA_Variant::data

points to the scalar or array data

enum { ... } UA_Variant::storageType

const UA_DataType* UA_Variant::type

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The documentation for this struct was generated from the following file:

• /home/travis/build/open62541/open62541/include/ua_types.h