Include the standard header <cwctype> to effectively include the standard header <wctype.h> within the std namespace.
#include <wctype.h>
namespace std {
using ::wint_t; using ::wctrans_t; using ::wctype_t;
using ::iswalnum; using ::iswalpha; using ::iswcntrl;
using ::iswctype; using ::iswdigit; using ::iswgraph;
using ::iswlower; using ::iswprint; using ::iswpunct;
using ::iswspace; using ::iswupper; using ::iswxdigit;
using ::towctrans; using ::towlower; using ::towupper;
using ::wctrans; using ::wctype;
#if __IBMCPP_TR1__
namespace tr1 {
using ::iswblank;
}
#endif
}
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