File Content Extraction 26.1
Filter SDK C++ Programming Guide

# The MetadataVisitorBase Class

Defined in: `Keyview_Metadata.hpp`

The `MetadataVisitorBase` class is an abstract base class that operates with the MetadataElement::apply_visitor function. You use the `MetadataVisitorBase` class by defining a class that inherits from it, implementing the required pure virtual member functions to handle each of the possible metadata item value types. You then call apply_visitor with an instance of your new class. The apply_visitor function ensures that the correct member function of your visitor is called with the metadata item value in its original type.

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Version 26.1 | Last updated January 2026

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Product: File Content Extraction 26.1

Topic Title: The MetadataVisitorBase Class