The process of externalising an object involves externalising its data to a stream.
For a class instance, this involves externalising each of its data members and components to a stream. This process is encapsulated by the ExternalizeL() member function of the class.
A class always defines ExternalizeL() as:
and uses the write stream interface class RWriteStream .
Note that ExternalizeL() is not virtual and there is no implication that a class that requires an ExternalizeL() function must be derived from any particular base class.
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