cctype

Functions to determine the category of narrow characters. More...

Functions
constexpr auto	isalnum (int ch) noexcept -> int
	Checks if the given character is an alphanumeric character as classified by the default C locale.
constexpr auto	isalpha (int ch) noexcept -> int
	Checks if the given character is an alphabetic character as classified by the default C locale.
constexpr auto	isblank (int ch) noexcept -> int
	Checks if the given character is a blank character as classified by the currently installed C locale. Blank characters are whitespace characters used to separate words within a sentence. In the default C locale, only space (0x20) and horizontal tab (0x09) are classified as blank characters.
constexpr auto	iscntrl (int ch) noexcept -> int
	Checks if the given character is a control character as classified by the currently installed C locale. In the default, "C" locale, the control characters are the characters with the codes 0x00-0x1F and 0x7F.
constexpr auto	isdigit (int ch) noexcept -> int
	Checks if the given character is one of the 10 decimal digits: 0123456789.
constexpr auto	isgraph (int ch) noexcept -> int
	Checks if the given character is graphic (has a graphical representation) as classified by the default C locale.
constexpr auto	islower (int ch) noexcept -> int
	Checks if the given character is classified as a lowercase character according to the default C locale.
constexpr auto	isprint (int ch) noexcept -> int
	Checks if ch is a printable character as classified by the default C locale.
constexpr auto	ispunct (int ch) noexcept -> int
	Checks if the given character is a punctuation character as classified by the current C locale.
constexpr auto	isspace (int ch) noexcept -> int
	Checks if the given character is whitespace character as classified by the default C locale.
constexpr auto	isupper (int ch) noexcept -> int
	Checks if the given character is classified as a uppercase character according to the default C locale.
constexpr auto	isxdigit (int ch) noexcept -> int
	Checks if the given character is a hexadecimal numeric character (0123456789abcdefABCDEF).
constexpr auto	tolower (int ch) noexcept -> int
	Converts the given character to lowercase according to the character conversion rules defined by the default C locale.
constexpr auto	toupper (int ch) noexcept -> int
	Converts the given character to uppercase according to the character conversion rules defined by the default C locale.

Detailed Description

Functions to determine the category of narrow characters.

#include <etl/cctype.hpp>

Function Documentation

isalnum()

auto isalnum ( int ch ) -> int

nodiscardconstexprnoexcept

Checks if the given character is an alphanumeric character as classified by the default C locale.

Parameters

ch	Character to classify.

Returns

Non-zero value if the character is an alphanumeric character, 0 otherwise.

https://en.cppreference.com/w/cpp/string/byte/isalnum

isalpha()

auto isalpha ( int ch ) -> int

nodiscardconstexprnoexcept

Checks if the given character is an alphabetic character as classified by the default C locale.

Parameters

ch	Character to classify.

Returns

Non-zero value if the character is an alphabetic character, 0 otherwise.

https://en.cppreference.com/w/cpp/string/byte/isalpha

isblank()

auto isblank ( int ch ) -> int

nodiscardconstexprnoexcept

Checks if the given character is a blank character as classified by the currently installed C locale. Blank characters are whitespace characters used to separate words within a sentence. In the default C locale, only space (0x20) and horizontal tab (0x09) are classified as blank characters.

Parameters

ch	Character to classify.

Returns

Non-zero value if the character is a blank character, zero otherwise.

https://en.cppreference.com/w/cpp/string/byte/isblank

iscntrl()

auto iscntrl ( int ch ) -> int

nodiscardconstexprnoexcept

Checks if the given character is a control character as classified by the currently installed C locale. In the default, "C" locale, the control characters are the characters with the codes 0x00-0x1F and 0x7F.

Parameters

ch	Character to classify.

Returns

Non-zero value if the character is a control character, zero otherwise.

https://en.cppreference.com/w/cpp/string/byte/iscntrl

isdigit()

auto isdigit ( int ch ) -> int

nodiscardconstexprnoexcept

Checks if the given character is one of the 10 decimal digits: 0123456789.

https://en.cppreference.com/w/cpp/string/byte/isdigit

Returns

Non-zero value if the character is a numeric character, zero otherwise.

Parameters

ch	Character to classify.

isgraph()

auto isgraph ( int ch ) -> int

nodiscardconstexprnoexcept

Checks if the given character is graphic (has a graphical representation) as classified by the default C locale.

Parameters

ch	Character to classify.

Returns

Non-zero value if the character is a punctuation character, zero otherwise.

https://en.cppreference.com/w/cpp/string/byte/isgraph

islower()

auto islower ( int ch ) -> int

nodiscardconstexprnoexcept

Checks if the given character is classified as a lowercase character according to the default C locale.

Parameters

ch	Character to classify.

Returns

Non-zero value if the character is a lowercase letter, zero otherwise.

https://en.cppreference.com/w/cpp/string/byte/islower

isprint()

auto isprint ( int ch ) -> int

nodiscardconstexprnoexcept

Checks if ch is a printable character as classified by the default C locale.

Parameters

ch	Character to classify.

Returns

Non-zero value if the character is a punctuation character, zero otherwise.

https://en.cppreference.com/w/cpp/string/byte/isprint

ispunct()

auto ispunct ( int ch ) -> int

nodiscardconstexprnoexcept

Checks if the given character is a punctuation character as classified by the current C locale.

The default C locale classifies the characters !"#$%&'()*+,-./:;<=>?@[]^_`{|}~ as punctuation.

Parameters

ch	Character to classify.

Returns

Non-zero value if the character is a punctuation character, zero otherwise.

https://en.cppreference.com/w/cpp/string/byte/ispunct

isspace()

auto isspace ( int ch ) -> int

nodiscardconstexprnoexcept

Checks if the given character is whitespace character as classified by the default C locale.

Parameters

ch	Character to classify.

Returns

Non-zero value if the character is a whitespace character, zero otherwise.

https://en.cppreference.com/w/cpp/string/byte/isspace

isupper()

auto isupper ( int ch ) -> int

nodiscardconstexprnoexcept

Checks if the given character is classified as a uppercase character according to the default C locale.

Parameters

ch	Character to classify.

Returns

Non-zero value if the character is a uppercase letter, zero otherwise.

https://en.cppreference.com/w/cpp/string/byte/isupper

isxdigit()

auto isxdigit ( int ch ) -> int

nodiscardconstexprnoexcept

Checks if the given character is a hexadecimal numeric character (0123456789abcdefABCDEF).

Parameters

ch	Character to classify.

Returns

Non-zero value if the character is a hexadecimal numeric character, zero otherwise.

https://en.cppreference.com/w/cpp/string/byte/isxdigit

tolower()

auto tolower ( int ch ) -> int

nodiscardconstexprnoexcept

Converts the given character to lowercase according to the character conversion rules defined by the default C locale.

In the default "C" locale, the following uppercase letters ABCDEFGHIJKLMNOPQRSTUVWXYZ are replaced with respective lowercase letters abcdefghijklmnopqrstuvwxyz.

Parameters

ch	Character to classify.

Returns

Lowercase version of ch or unmodified ch if no lowercase version is listed in the current C locale.

https://en.cppreference.com/w/cpp/string/byte/tolower

toupper()

auto toupper ( int ch ) -> int

nodiscardconstexprnoexcept

Converts the given character to uppercase according to the character conversion rules defined by the default C locale.

In the default "C" locale, the following lowercase letters abcdefghijklmnopqrstuvwxyz are replaced with respective uppercase letters ABCDEFGHIJKLMNOPQRSTUVWXYZ.

Parameters

ch	Character to classify.

Returns

Converted character or ch if no uppercase version is defined by the current C locale.

https://en.cppreference.com/w/cpp/string/byte/toupper

Examples

string.cpp.