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  • #16403

Closed
Open
Created Mar 07, 2019 by hesiod@trac-hesiod

Add isBinDigit to Data.Char

The Data.Char module contains helper functions that determine whether a Char is a decimal, octal or hexadecimal digit (isDigit, isOctDigit, isHexDigit). A similar helper function for binary digits is not included for no apparent reason (maybe because the number parsers in the Numeric module also don't support binary digits?).

The implementation for such a isBinDigit should be trivial, aside from performance considerations: isDigit and friends perform the test using only subtraction and an unsigned comparison, I'm not sure whether isBinDigit offers any different performant implementations.

Trac metadata
Trac field Value
Version 8.6.4
Type FeatureRequest
TypeOfFailure OtherFailure
Priority normal
Resolution Unresolved
Component libraries/base
Test case
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