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(guile.info.gz) Delayed Evaluation

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 28.5 Delayed Evaluation
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 [delay]
 
  -- Scheme Procedure: promise? obj
  -- C Function: scm_promise_p (obj)
      Return true if OBJ is a promise, i.e. a delayed computation (
      Delayed evaluation (r5rs.info)Delayed evaluation.).
 
  -- Scheme Procedure: force x
  -- C Function: scm_force (x)
      If the promise X has not been computed yet, compute and return X,
      otherwise just return the previously computed value.
 
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