:: Char -> Int

Convert a single digit Char to the corresponding Int. This function fails unless its argument satisfies isHexDigit, but recognises both upper- and lower-case hexadecimal digits (that is, '0'..'9', 'a'..'f', 'A'..'F').

Examples

Characters '0' through '9' are converted properly to 0..9:

>>> map digitToInt ['0'..'9']
[0,1,2,3,4,5,6,7,8,9]

Both upper- and lower-case 'A' through 'F' are converted as well, to 10..15.

>>> map digitToInt ['a'..'f']
[10,11,12,13,14,15]

>>> map digitToInt ['A'..'F']
[10,11,12,13,14,15]

Anything else throws an exception:

>>> digitToInt 'G'
*** Exception: Char.digitToInt: not a digit 'G'

>>> digitToInt '♥'
*** Exception: Char.digitToInt: not a digit '\9829'

The fromEnum method restricted to the type Char.

Return length of an individual Char.

Returns the display width of a character. Assumes all characters with unknown widths are 0 width.

Returns width of a character in a monospace font: 0 for a combining character, 1 for a regular character, 2 for an East Asian wide character. Ambiguous characters are treated as width 1.

Converts an ASCII character to its corresponding numeric value between 0 and 127

toInt Null == 0
toInt CapitalLetterA == 6
toInt SmallLetterA == 97
toInt Delete == 127

Returns the combining class of a character.

Binding to the native wcwidth.

Converts an ISBN-10 character to a numeric value. Valid input characters include 0-9 as well as X.

Calls perror to indicate an unknown format letter for a given type.

Get the dimension of an object whose vector space is an instance of HasLinearMap, e.g. transformations, paths, diagrams, etc.

Convert to an Int. It is implementation-dependent what fromEnum returns when applied to a value that is too large to fit in an Int.

Computes the storage requirements (in bytes) of the argument. The value of the argument is not used.