Character classification¶

Character classification similar to the one provided in <cctype>. The difference is that functions here:

Don’t implicitly account for the locale.
Are a few times faster than the standard ones, because they don’t account for the locale and can be efficiently inlined.
Return bool as expected.
Don’t try to handle the EOF character.

Reference¶

namespace ac¶

Functions

inline bool is_digit(char c) noexcept¶: Checks if c is a decimal digit.

inline bool is_lower(char c) noexcept¶: Checks if c is a lowercase letter.

inline bool is_upper(char c) noexcept¶: Checks if c is an uppercase letter.

inline bool is_alpha(char c) noexcept¶: Checks if c is an alphabetic character (a letter).

inline bool is_alphanumeric(char c) noexcept¶: Checks if c is an alphabetic character or a decimal digit.

inline bool is_space(char c) noexcept¶

Checks if c is a whitespace character, that is one of:

space (0x20, ‘ ‘)
form feed (0x0c, ‘\f’)
line feed (0x0a, ‘\n’)
carriage return (0x0d, ‘\r’)
horizontal tab (0x09, ‘\t’)
vertical tab (0x0b, ‘\v’)