Declaration

int iswctype(wint_t wChar, wctype_t qCategory);

Description

This function returns a nonzero integer if the argument "wChar" is of the category type described by "qCategory." Otherwise, the function returns zero.

The type category can be generated by the function wctype(), so that the following function calls are equivalent:

iswalnum(wChar) = iswctype(wChar, wctype("alnum"))
iswalpha(wChar) = iswctype(wChar, wctype("alpha"))
iswcntrl(wChar) = iswctype(wChar, wctype("cntrl"))
iswdigit(wChar) = iswctype(wChar, wctype("digit"))
iswgraph(wChar) = iswctype(wChar, wctype("graph"))
iswlower(wChar) = iswctype(wChar, wctype("lower"))
iswprint(wChar) = iswctype(wChar, wctype("print"))
iswpunct(wChar) = iswctype(wChar, wctype("punct"))
iswspace(wChar) = iswctype(wChar, wctype("space"))
iswupper(wChar) = iswctype(wChar, wctype("upper"))
iswxdigit(wChar) = iswctype(wChar, wctype("xdigit"))

Example

#include <iostream>
#include <cwctype>

int main() {
    using namespace std;

    // Output the column headings
    cout << "    ";
    for (int iIndex = 0; iIndex < 16; ++iIndex) {
        if (iIndex < 10) {
            cout << " ";
        }
        cout << " " << iIndex;
    }
    cout << endl << endl;

    for (int iIndex = 0; iIndex < 352; ++iIndex) {
        // Output the row heading every 16 places
        if ((iIndex) % 16 == 0) {
            if (iIndex < 10) {
                cout << "  ";
            } else if (iIndex < 100) {
                cout << " ";
            }
            cout << iIndex << " ";
        }
        cout << "  " << (bool)iswctype(iIndex, wctype("alnum"));
        // Add an endline every 16 characters
        if ((iIndex) % 16 == 15) {
            cout << endl;
        }
    }
    return 0;
}

Output