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January 14, 2016 06:49
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F# bitwise pattern match
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| let parseState value = | |
| match value with | |
| | 0us -> | |
| printfn "state 0" | |
| | value when value &&& 16us <> 16us -> | |
| printfn "state 1" | |
| | value when value &&& 32us <> 32us -> | |
| printfn "state 2" | |
| | value when value &&& 64us <> 64us -> | |
| printfn "state 3" | |
| | value when value &&& 4096us <> 4096us -> | |
| printfn "state 4" | |
| | value when value &&& 8192us <> 8192us -> | |
| printfn "state 5" | |
| | _ -> | |
| printfn "Unexpected state" |
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Not sure why state 0 is always matched, does it read 0us as a variable maybe? That shouldn't be the case since I don't think you're allowed to start a variable name with a number. Either way, we do match and set the new variable name to the same as the one you matched on, it's confusing.