November 2019
Beginner to intermediate
674 pages
15h
English
Content preview from Mastering Delphi Programming: A Complete Reference Guide
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Marker interface
The marker interface pattern has its origin in the Java world. It is used to provide metadata capabilities in a language that doesn't have explicit support for that. The marker interface concept was largely replaced with the use of attributes or a similar code annotation tool in modern languages.
In programming, metadata provides a way of adding code-describing tags to the program. Unlike normal data variables and fields, which store information required to run the program and to process user data, metadata provides data about classes (and variables and fields) themselves.
Metadata is a label attached to a product. It is a note on a car dashboard saying, "Change oil at 150.000 km," or a message on a sandwich in a communal ...
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