8 lines
336 B
OCaml
8 lines
336 B
OCaml
type ('s, 't, 'a, 'b) lens = ('s -> 'a) * ('b -> 's -> 't)
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type ('s, 'a) lens' = ('s, 's, 'a, 'a) lens
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val lens : view:('s -> 'a) -> set:('b -> 's -> 't) -> ('s, 't, 'a, 'b) lens
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val view : ('s, 't, 'a, 'b) lens -> 's -> 'a
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val set : ('s, 't, 'a, 'b) lens -> 'b -> 's -> 't
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val over : ('s, 't, 'a, 'b) lens -> f:('a -> 'b) -> 's -> 't
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