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27 lines
535 B
Plaintext
27 lines
535 B
Plaintext
structural ability State s where
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put : s -> {State s} ()
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get : {State s} s
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state : s -> Request (State s) a -> s
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state s = cases
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{ State.get -> k } -> handle k s with state s
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{ State.put snew -> k } -> handle k () with state snew
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{ a } -> s
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modify : (s ->{} s) -> {State s} ()
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modify f = State.put (f State.get)
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increment : '{State Nat} ()
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increment = '(modify ((+) 1))
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ex : Nat
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ex = handle
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State.put (11 + 1)
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-- !increment
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-- !increment
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-- !increment
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State.get -- should be 15, amirite??
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with state 10
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> ex
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