13.21 cwctype
| iswalnum function | Determines whether a wide character is alphanumeric |
int iswalnum (wint_t wc) |
The iswalnum function returns true (nonzero) if either iswalpha(wc) or iswdigit(wc) is true.
See Also
iswalpha function, iswdigit function, isalnum in <cctype>
| iswalpha function | Determines whether a wide character is alphabetic |
int iswalpha (wint_t wc) |
The iswalpha function returns true (nonzero) if wc is an alphabetic character, that is, a wide character for which iswcntrl , iswdigit , iswpunct , and iswspace all return false ( ).
See Also
iswcntrl function, iswdigit function, iswpunct function, iswspace function, isalpha in <cctype>
| iswcntrl function | Determines whether a wide character is a control character |
int iswcntrl (wint_t wc) |
The iswcntrl function returns true (nonzero) if wc is a wide control character, that is, a wide character for which iswalnum , iswpunct , and iswspace all return false ( ).
See Also
iswalnum function, iswpunct function, iswspace function, iscntrl in <cctype>
| iswctype function | Tests any category of a wide character |
int iswctype (wint_t wc, wctype_t desc) |
The iswctype function tests any category of the wide character wc . The category to test is specified by desc , which must be obtained by calling wctype . The setting of the LC_CTYPE category must be the same for the call to iswctype and the call to wctype that returned desc .
Using iswctype , you can implement all the isw . . . functions. For example, you can implement the iswalnum function as follows :
int iswalnum(wint_t wc) { return std::iswctype(wc, std::wctype("alnum")); } See Also
wctype function, wctype_t type
| iswdigit function | Determines whether a wide character is a digit |
int iswdigit (wint_t wc) |
The iswdigit function returns true (nonzero) if wc is a decimal digit characterthat is, ' '-' 9 'regardless of locale.
See Also
iswxdigit function, isdigit in <cctype>
| iswgraph function | Determines whether a wide character is graphic |
int iswgraph (wint_t wc) |
The iswgraph function returns true (nonzero) if iswprint(wc) is true and iswspace(wc) is false. Note that iswgraph is slightly different from isgraph in that it returns true for whitespace characters other than ' '.
See Also
iswprint function, iswspace function
| iswlower function | Determines whether a wide character is lowercase |
int iswlower (wint_t wc) |
The iswlower function returns true (nonzero) if wc is a lowercase character.
See Also
iswalpha function, iswupper function, towlower function, islower in <cctype>
| iswprint function | Determines whether a wide character is printable |
int iswprint (wint_t wc) |
The iswprint function returns true (nonzero) if wc is a printable wide character.
See Also
iswgraph function, isprint in <cctype>
| iswpunct function | Determines whether a wide character is punctuation |
int iswpunct (wint_t wc) |
The iswpunct function returns true (nonzero) if iswalnum(wc) , iswcntrl(wc) , and iswspace(wc) are false.
See Also
iswalnum function, iswcntrl function, iswspace function, ispunct in <cctype>
| iswspace function | Determines whether a wide character is whitespace |
int iswspace (wint_t wc) |
The iswspace function returns true (nonzero) if wc is a whitespace character.
See Also
iswgraph function, iswprint function, isspace in <cctype>
| iswupper function | Determines whether a wide character is uppercase |
int iswupper (wint_t wc) |
The iswupper function returns true (nonzero) if wc is an uppercase character.
See Also
iswalpha function, iswlower function, towupper function, isupper in <cctype>
| iswxdigit function | Determines whether a wide character is a hexadecimal digit |
int iswxdigit (wint_t wc) |
The iswxdigit function returns true (nonzero) if wc is a hexadecimal digit characterthat is, ' '-' 9 ', ' a '-' f ', or ' A '-' F 'regardless of locale.
See Also
iswdigit function, isxdigit in <cctype>
| towctrans function | Translates a wide character's case |
wint_t towctrans (wint_t wc, wctrans_t desc) |
The towctrans function translates the wide character wc according to the description desc , which was returned from the wctrans function. For example, the towlower function can be implemented using towctrans :
wint_t towlower(wint_t wc) { return std::towctrans(wc, std::wctrans("tolower")); } See Also
wctrans function, wctrans_t type
| towlower function | Converts a wide character to lowercase |
wint_t towlower (wint_t wc) |
The towlower function maps the wide character wc to lowercase. If iswupper(wc) is false, or if wc has no lowercase mapping, wc is returned unchanged.
See Also
towctrans function, towupper function, tolower in <cctype>
| towupper function | Converts a wide character to uppercase |
wint_t towupper (wint_t wc) |
The towupper function maps the wide character wc to uppercase. If iswlower(wc) is false, or if wc has no uppercase mapping, wc is returned unchanged.
See Also
towctrans function, towlower function, toupper in <cctype>
| wctrans function | Construct a wctrans_t object |
wctrans_t wctrans (const char* property) |
The wctrans function constructs a wctrans_t object according to the given property. Table 13-7 lists the properties defined in the standard.
Table 13-7. Character translation properties
| Property | Description |
|---|---|
| " tolower " | Maps from uppercase to lowercase |
| " toupper " | Maps from lowercase to uppercase |
See Also
towctrans function, wctrans_t type
| wctrans_t type | Represents a wide character translation |
typedef . . . wctrans_t |
The wctrans_t type is a scalar type used to represent character mappings for the towctrans function.
See Also
towctrans function, wctrans function, <clocale>
| wctype function | Constructs a wctype_t object |
wctype_t wctype (const char* property) |
The wctype function constructs a wctype_t object that describes wide characters that have the given property. Table 13-8 lists the properties that are supported by this standard.
Table 13-8. Character classification properties
| Property | Description |
|---|---|
| " alnum " | Alphanumeric |
| " alpha " | Alphabetic |
| " cntrl " | Control |
| " digit " | Digit |
| " graph " | Non-space printable |
| " lower " | Lowercase |
| " print " | Printable or whitespace |
| " punct " | Punctuation |
| " space " | Whitespace |
| " upper " | Uppercase |
| " xdigit " | Hexadecimal digit |
See Also
iswctype function, wctype_t type, <clocale>
| wctype_t type | Represents a character classification |
typedef . . . wctype_t |
The wctype_t type is a scalar type used to represent character classifications for the iswctype function.
See Also
iswctype function, wctype function, <clocale>
| WEOF macro | End-of-file or error |
wint_t WEOF |
The WEOF macro expands to a constant integer value that does not correspond to any valid wide character value. Unlike EOF , WEOF is not guaranteed to be negative.
See Also
WEOF in <cwchar> , EOF in <cstdio>
| wint_t type | Integer representation of a wide character |
typedef . . . wint_t |
The wint_t type is an integral type that represents wide characters. It can hold the value for any character in the extended character set plus the value WEOF .
See Also
wint_t in <cwchar>
