class

std::ctype_base

class ctype_base;

Base class for ctype

This is not a facet type, but the base class that defines the mask bitmask member type to be inherited by ctype facet classes:

member type	description
`mask`	An enum type used as bitmask.

member constant	type	value	description
`space`	`ctype_base::mask`	unspecified (unique bits)	white-space character
`print`	`ctype_base::mask`	unspecified (unique bits)	printable character
`cntrl`	`ctype_base::mask`	unspecified (unique bits)	control character
`upper`	`ctype_base::mask`	unspecified (unique bits)	uppercase letter
`lower`	`ctype_base::mask`	unspecified (unique bits)	lowercase letter
`alpha`	`ctype_base::mask`	unspecified (unique bits)	alphabetic character
`digit`	`ctype_base::mask`	unspecified (unique bits)	decimal digit
`punct`	`ctype_base::mask`	unspecified (unique bits)	punctuation character
`xdigit`	`ctype_base::mask`	unspecified (unique bits)	hexadecimal digit
`alnum`	`ctype_base::mask`	`alpha\|digit`	alpha-numeric character
`graph`	`ctype_base::mask`	`alnum\|punct`	character with graphic representation

See <cctype> for details on how ASCII characters are classified with respect to these categories.

member type	description
`mask`	A bitmask type (such as an `enum`, an integer type, or a `bitset`).

member constant	type	value	description
`space`	`ctype_base::mask`	unspecified (unique bits)	white-space character
`print`	`ctype_base::mask`	unspecified (unique bits)	printable character
`cntrl`	`ctype_base::mask`	unspecified (unique bits)	control character
`upper`	`ctype_base::mask`	unspecified (unique bits)	uppercase letter
`lower`	`ctype_base::mask`	unspecified (unique bits)	lowercase letter
`alpha`	`ctype_base::mask`	unspecified (unique bits)	alphabetic character
`digit`	`ctype_base::mask`	unspecified (unique bits)	decimal digit
`punct`	`ctype_base::mask`	unspecified (unique bits)	punctuation character
`xdigit`	`ctype_base::mask`	unspecified (unique bits)	hexadecimal digit
`blank`	`ctype_base::mask`	unspecified (unique bits)	blank character
`alnum`	`ctype_base::mask`	`alpha\|digit`	alpha-numeric character
`graph`	`ctype_base::mask`	`alnum\|punct`	character with graphic representation