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Quoting Wikipedia:

The word thunk has at least three related meanings in computing science. A “thunk” may be:

1. A piece of code to perform a delayed computation (similar to a closure)
2. A feature of some virtual function table implementations (similar to a wrapper function)
3. A mapping of machine data from one system-specific form to another, usually for compatibility reasons

In all three senses, the word refers to a piece of low-level code, usually machine-generated, that implements some detail of a particular software system.

In this post (whose name looks like an unrelated typo) we shall observe the need for a thunk of the second kind, in C++.

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