[classification]

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template<class charT> bool isspace (charT c, const locale& loc);
template<class charT> bool isprint (charT c, const locale& loc);
template<class charT> bool iscntrl (charT c, const locale& loc);
template<class charT> bool isupper (charT c, const locale& loc);
template<class charT> bool islower (charT c, const locale& loc);
template<class charT> bool isalpha (charT c, const locale& loc);
template<class charT> bool isdigit (charT c, const locale& loc);
template<class charT> bool ispunct (charT c, const locale& loc);
template<class charT> bool isxdigit(charT c, const locale& loc);
template<class charT> bool isalnum (charT c, const locale& loc);
template<class charT> bool isgraph (charT c, const locale& loc);
template<class charT> bool isblank (charT c, const locale& loc);

Each of these functions isF returns the result of the expression:

use_facet<ctype<charT>>(loc).is(ctype_base::F, c)

where F is the ctype_base::mask value corresponding to that function ([category.ctype]).259

259)

When used in a loop, it is faster to cache the ctype<> facet and use it directly, or use the vector form of ctype<>::is.

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28 Localization library [localization]

28.3 Locales [locales]

28.3.3 Convenience interfaces [locale.convenience]

28.3.3.1 Character classification [classification]