package batteries

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package batteries
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Module
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Parameter
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val eq_by : ('a -> 'b) -> 'a eq
val comp_by : ('a -> 'b) -> 'a comp
val ord_by : ('a -> 'b) -> 'a ord

Build a eq, cmp or ord function from a projection function. For example, if you wanted to compare integers based on their lowest 4 bits, you could write let cmp_bot4 = cmp_by (fun x -> x land 0xf) and use cmp_bot4 as the desired integer comparator.