Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. In computer programming, a Type Tunnel pattern is where a group of physically-unrelated types may be tunneled through an extensible adaptation layer and presented in unified form to an underlying layer for manipulation as a whole. It consists of the following: 1. a generic, extensible interface layer, used in client code, which can interact with heterogeneous types, and 2. a tunnel mechanism, which translates between the heterogeneous types expressed in the client code into the type understood by 3. a concrete API layer, which manipulates a single concrete type.

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