File Content Extraction 26.1
Filter SDK C++ Programming Guide

# apply_visitor

A method that allows you to access the summary information values in their original type through a visitor pattern.

To access the values, you must create a visitor class, with methods that can handle the possible item value types. Then you pass this class to `apply_visitor`, which establishes the correct type and calls the applicable member function on your visitor.

## Syntax

    template< typename ReturnT >
    ReturnT apply_visitor(SummaryInfoVisitorBase< ReturnT >&) const;

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Version 26.1 | Last updated January 2026

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Product: File Content Extraction 26.1

Topic Title: apply_visitor