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CPL is a functional programming language based on category
theory. Data types are declared in a categorical manner by
adjunctions. Data types that can be handled include the terminal
object, the initial object, the binary product functor, the binary
coproduct functor, the exponential functor, the natural number object,
the functor for finite lists, and the functor for infinite lists.
Each data type is declared with its basic operations or
morphisms. Programs consist of these morphisms, and execution of
programs is the reduction of elements (i.e. special morphisms) to
their canonical form.
