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(define-module (control monad procedures)
#:use-module (oop goops)
#:use-module (srfi srfi-1) ; concatenate!
#:export (>> >>=))
(define-generic >>=)
(define-method (>>= (this <null>) proc) '())
(define-method (>>= (this <pair>)
(proc <procedure>))
(concatenate! (map proc this)))
(define-generic >>)
(define-method (>> (a <null>) (b <null>)) '())
(define-method (>> (a <pair>) (b <null>)) '())
(define-method (>> (a <null>) (b <pair>)) '())
(define-method (>> (a <pair>) (b <pair>))
(concatenate! (map (constant b) a)))
;; bind :: Monad m => m a -> (a -> m b) -> m b
;; return :: Monad m => a -> m a
;; map :: Functor f => (a -> b) -> f a -> f b
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