Character category bitmask type
This member type is inherited from ctype_base.
It is a bitmask type used as parameter for member functions is, scan_is and scan_not, and may take any bitwise combination of the following enum values:
| value | Characteristics |
|---|
| space | White-space character |
| print | Printable character |
| cntrl | Control character |
| upper | Uppercase letter |
| lower | Lowercase letter |
| alpha | Alphabetic letter |
| digit | Decimal digit |
| punct | Punctuation mark |
| xdigit | Hexadecimal character |
These categories are based on those defined in the C library header <cctype>. See the reference for cctype for the classification in these categories of characters of type char.
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