TReaderProc is a type of callback procedure called used by TFiler and descendant DefineProperty methods.
TReaderProc = procedure (Reader: TReader) of object;
(Reader: TReader) ( TReaderProc)();
DefineProperty introduces an abstract method that allows descendants to read or write data like a property.
Each descendant filer object declares a DefineProperty method that defines the data that the descendant object will read or write as if the data were a property.
TReaderProc is the callback procedure parameter in that DefineProperty. When called, it supplies the TFiler or descendant object, allowing read access.
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