--- layout: default title: "Generic" parent: Abstraction ancestor: Funcons-beta --- [Funcons-beta] : [Generic.cbs] ----------------------------- ### Generic abstractions 
[
  Type   abstractions
  Funcon abstraction
  Funcon closure
  Funcon enact
]
Meta-variables
  T <: values
  T? <: values?
Type
  abstractions(_:computation-types)
Funcon
  abstraction(_:T?=>T) : abstractions(T?=>T)
The funcon abstraction(X) forms abstraction values from computations. References to bindings of identifiers in X are dynamic. The funcon closure(X) forms abstractions with static bindings. 
Funcon
  closure(_:T?=>T) : =>abstractions(T?=>T)
closure(X) computes a closed abstraction from the computation X. In contrast to abstraction(X), references to bindings of identifiers in X are static. Moreover, closure(X) is not a value constructor, so it cannot be used in pattern terms in rules. 
Rule
  environment(Rho) |- closure(X) ---> abstraction(closed(scope(Rho, X)))
Funcon
  enact(_:abstractions(T?=>T)) : T?=>T
enact(A) executes the computation of the abstraction A, with access to all the current entities. 
Rule
  enact(abstraction(X)) ~> X
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