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Includes the Standard C library header <wctype.h> and adds the associated names to the std namespace.


#include <cwctype>


Including this header ensures that the names declared using external linkage in the Standard C library header are declared in the std namespace.


namespace std {
    using wint_t = see below ;
    using wctrans_t = see below ;
    using wctype_t = see below ;

#define WEOF see below


int iswalnum(wint_t wc);
int iswalpha(wint_t wc);
int iswblank(wint_t wc);
int iswcntrl(wint_t wc);
int iswdigit(wint_t wc);
int iswgraph(wint_t wc);
int iswlower(wint_t wc);
int iswprint(wint_t wc);
int iswpunct(wint_t wc);
int iswspace(wint_t wc);
int iswupper(wint_t wc);
int iswxdigit(wint_t wc);
int iswctype(wint_t wc, wctype_t desc);
wctype_t wctype(const char* property);
wint_t towlower(wint_t wc);
wint_t towupper(wint_t wc);
wint_t towctrans(wint_t wc, wctrans_t desc);
wctrans_t wctrans(const char* property);

See also

Header Files Reference
C++ Standard Library Overview
Thread Safety in the C++ Standard Library