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1. signum :: Num a => a -> a

   base	Prelude

   Sign of a number. The functions abs and signum should satisfy the law:

   abs x * signum x == x
   

   For real numbers, the signum is either -1 (negative), 0 (zero) or 1 (positive).

2. toEnum :: Enum a => Int -> a

   base	Prelude

   Convert from an Int.

3. getNumCapabilities :: IO Int

   base	Control.Concurrent

   Returns the number of Haskell threads that can run truly simultaneously (on separate physical processors) at any given time. To change this value, use setNumCapabilities.

4. setNumCapabilities :: Int -> IO ()

   base	Control.Concurrent

   Set the number of Haskell threads that can run truly simultaneously (on separate physical processors) at any given time. The number passed to forkOn is interpreted modulo this value. The initial value is given by the +RTS -N runtime flag. This is also the number of threads that will participate in parallel garbage collection. It is strongly recommended that the number of capabilities is not set larger than the number of physical processor cores, and it may often be beneficial to leave one or more cores free to avoid contention with other processes in the machine.

5. DecimalNumber :: GeneralCategory

   base	Data.Char

   Nd: Number, Decimal

6. LetterNumber :: GeneralCategory

   base	Data.Char

   Nl: Number, Letter

7. OtherNumber :: GeneralCategory

   base	Data.Char

   No: Number, Other

8. isAlphaNum :: Char -> Bool

   base	Data.Char

   Selects alphabetic or numeric Unicode characters. Note that numeric digits outside the ASCII range, as well as numeric characters which aren't digits, are selected by this function but not by isDigit. Such characters may be part of identifiers but are not used by the printer and reader to represent numbers, e.g., Roman numerals like V, full-width digits like '１' (aka '65297'). This function returns True if its argument has one of the following GeneralCategorys, or False otherwise:

   • UppercaseLetter
   • LowercaseLetter
   • TitlecaseLetter
   • ModifierLetter
   • OtherLetter
   • DecimalNumber
   • LetterNumber
   • OtherNumber

9. isNumber :: Char -> Bool

   base	Data.Char

   Selects Unicode numeric characters, including digits from various scripts, Roman numerals, et cetera. This function returns True if its argument has one of the following GeneralCategorys, or False otherwise:

   • DecimalNumber
   • LetterNumber
   • OtherNumber
   These classes are defined in the Unicode Character Database, part of the Unicode standard. The same document defines what is and is not a "Number".

   Examples

   Basic usage:

   >>> isNumber 'a'
   False
   
   >>> isNumber '%'
   False
   
   >>> isNumber '3'
   True
   

   ASCII '0' through '9' are all numbers:

   >>> and $ map isNumber ['0'..'9']
   True
   

   Unicode Roman numerals are "numbers" as well:

   >>> isNumber 'Ⅸ'
   True
   

10. module Data.Enum

    The Enum and Bounded classes.

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