According to Chapter 9 of GenerativeProgrammingBook: a generator is a program that takes a higher-level specification of piece of software and produces its implementation. Generators address the following issues:

• Raising the intentionality of system descriptions
• Computing an efficient implementation
• Avoiding the library scaling problem

Chapter 9 of GenerativeProgrammingBook discusses GenVoca in quite some detail as an example generator.

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CategoryTransformation | -- EelcoVisser, ArieVanDeursen