Attribute group handles

TAttributeGroupHandle class refers to an instance of class TInternalAttributeGroup. Any number of instances of class TAttributeGroupHandle can refer to the same internal attribute group instance.

Whenever the TInternalAttributeGroup it refers to is changed, TAttributeGroupHandle's NotifyChanged member function is called.

TAttributeGroupHandle has pointer semantics; that is, it explicitly shares the group to which it refers.

This class is not synchronized, therefore it is not multithread safe.


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