NAME¶

std::iswctype - std::iswctype

Synopsis¶

Defined in header <cwctype>
int iswctype( std::wint_t wc, std::wctype_t desc );

Classifies the wide character wc using the current C locale's LC_CTYPE category
identified by desc.

If the value of wc is neither representable as a wchar_t nor equal to the value of
the macro WEOF, the behavior is undefined.

Parameters¶

wc - the wide character to classify
desc - the LC_CTYPE category, obtained from a call to std::wctype

Return value¶

Non-zero if the character ch has the property identified by desc in LC_CTYPE facet
of the current C locale, zero otherwise.

Example¶

// Run this code

#include <clocale>
#include <cwctype>
#include <iostream>
bool classify(wchar_t wc, const std::string& cat)
{
return std::iswctype(wc, std::wctype(cat.c_str()));
}
int main()
{
std::setlocale(LC_ALL, "ja_JP.UTF-8");
std::cout << "The character \u6c34 is...\n";
for(std::string s : {"digit", "alpha", "space", "cntrl", "jkanji"})
std::cout << s << "? " << std::boolalpha << classify(L'\u6c34', s) << '\n';
}

Output:¶

The character 水 is...
digit? false
alpha? true
space? false
cntrl? false
jkanji? true

See also¶

wctype looks up a character classification category in the current C locale
(function)