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This is an older version of Boost and was released in 2019. The current version is 1.89.0.
Spirit.Karma generators fall into a couple of generalized concepts. The Generator is the most fundamental concept. All Spirit.Karma generators are models of the Generator concept. PrimitiveGenerator, UnaryGenerator, BinaryGenerator, NaryGenerator, and Nonterminal are all refinements of the Generator concept.
The following sections provide details on these concepts.