[locale.syn]

namespace std { // [locale], locale class locale; template<class Facet> const Facet& use_facet(const locale&); template<class Facet> bool has_facet(const locale&) noexcept; // [locale.convenience], convenience interfaces 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); template<class charT> charT toupper(charT c, const locale& loc); template<class charT> charT tolower(charT c, const locale& loc); // [category.ctype], ctype class ctype_base; template<class charT> class ctype; template<> class ctype<char>; // specialization template<class charT> class ctype_byname; class codecvt_base; template<class internT, class externT, class stateT> class codecvt; template<class internT, class externT, class stateT> class codecvt_byname; // [category.numeric], numeric template<class charT, class InputIterator = istreambuf_iterator<charT>> class num_get; template<class charT, class OutputIterator = ostreambuf_iterator<charT>> class num_put; template<class charT> class numpunct; template<class charT> class numpunct_byname; // [category.collate], collation template<class charT> class collate; template<class charT> class collate_byname; // [category.time], date and time class time_base; template<class charT, class InputIterator = istreambuf_iterator<charT>> class time_get; template<class charT, class InputIterator = istreambuf_iterator<charT>> class time_get_byname; template<class charT, class OutputIterator = ostreambuf_iterator<charT>> class time_put; template<class charT, class OutputIterator = ostreambuf_iterator<charT>> class time_put_byname; // [category.monetary], money class money_base; template<class charT, class InputIterator = istreambuf_iterator<charT>> class money_get; template<class charT, class OutputIterator = ostreambuf_iterator<charT>> class money_put; template<class charT, bool Intl = false> class moneypunct; template<class charT, bool Intl = false> class moneypunct_byname; // [category.messages], message retrieval class messages_base; template<class charT> class messages; template<class charT> class messages_byname; }

262)

In this subclause, the type name struct tm is an incomplete type that is defined in <ctime>.

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28 Localization library [localization]

28.2 Header <locale> synopsis [locale.syn]