# Standard library header <locale>

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This header is part of the localization library.

### Classes
locale | set of polymorphic facets that encapsulate cultural differences (class)
##### String and stream conversions
wstring_convert (C++11)(deprecated in C++17) | performs conversions between a wide string and a byte string (class template)
wbuffer_convert (C++11)(deprecated in C++17) | performs conversion between a byte stream buffer and a wide stream buffer (class template)
##### Facet category base classes
ctype_base | defines character classification categories (class)
codecvt_base | defines character conversion errors (class)
messages_base | defines messages catalog type (class)
time_base | defines date format constants (class)
money_base | defines monetary formatting patterns (class)
##### Facet categories
ctype | defines character classification tables (class template)
ctype<char> | specialization of std::ctype for type char (class template specialization)
codecvt | converts between character encodings, including UTF-8, UTF-16, UTF-32 (class template)
collate | defines lexicographical comparison and hashing of strings (class template)
messages | implements retrieval of strings from message catalogs (class template)
time_get | parses time/date values from an input character sequence into std::tm (class template)
time_put | formats contents of std::tm for output as character sequence (class template)
num_get | parses numeric values from an input character sequence (class template)
num_put | formats numeric values for output as character sequence (class template)
numpunct | defines numeric punctuation rules (class template)
money_get | parses and constructs a monetary value from an input character sequence (class template)
money_put | formats a monetary value for output as a character sequence (class template)
moneypunct | defines monetary formatting parameters used by std::money_get and std::money_put (class template)
##### Locale-specific facet categories
ctype_byname | represents the system-supplied std::ctype for the named locale (class template)
codecvt_byname | represents the system-supplied std::codecvt for the named locale (class template)
messages_byname | represents the system-supplied std::messages for the named locale (class template)
collate_byname | represents the system-supplied std::collate for the named locale (class template)
time_get_byname | represents the system-supplied std::time_get for the named locale (class template)
time_put_byname | represents the system-supplied std::time_put for the named locale (class template)
numpunct_byname | represents the system-supplied std::numpunct for the named locale (class template)
moneypunct_byname | represents the system-supplied std::moneypunct for the named locale (class template)
### Functions
##### Locales and facets
use_facet | obtains a facet from a locale (function template)
has_facet | checks if a locale implements a specific facet (function template)
##### Character classification
isspace(std::locale) | checks if a character is classified as whitespace by a locale (function template)
isblank(std::locale) (C++11) | checks if a character is classified as a blank character by a locale (function template)
iscntrl(std::locale) | checks if a character is classified as a control character by a locale (function template)
isupper(std::locale) | checks if a character is classified as uppercase by a locale (function template)
islower(std::locale) | checks if a character is classified as lowercase by a locale (function template)
isalpha(std::locale) | checks if a character is classified as alphabetic by a locale (function template)
isdigit(std::locale) | checks if a character is classified as a digit by a locale (function template)
ispunct(std::locale) | checks if a character is classified as punctuation by a locale (function template)
isxdigit(std::locale) | checks if a character is classified as a hexadecimal digit by a locale (function template)
isalnum(std::locale) | checks if a character is classified as alphanumeric by a locale (function template)
isprint(std::locale) | checks if a character is classified as printable by a locale (function template)
isgraph(std::locale) | checks if a character is classified as graphical by a locale (function template)
##### Character conversions
toupper(std::locale) | converts a character to uppercase using the ctype facet of a locale (function template)
tolower(std::locale) | converts a character to lowercase using the ctype facet of a locale (function template)

#### Synopsis

    namespace std {

        // locale:
        class locale;
        template <class Facet> const Facet& use_facet(const locale&);
        template <class Facet> bool has_facet(const locale&) noexcept;

        // 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> CharT toupper(CharT c, const locale& loc);
        template <class CharT> CharT tolower(CharT c, const locale& loc);
        template <class Codecvt, class Elem = wchar_t,
                  class Wide_alloc = std::allocator<Elem>,
            class Byte_alloc = std::allocator<char>> class wstring_convert;
        template <class Codecvt, class Elem = wchar_t,
                  class Tr = char_traits<Elem>> class wbuffer_convert;

        // 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;

        // numeric:
        template <class CharT, class InputIter = istreambuf_iterator<CharT>> class num_get;
        template <class CharT, class OutputIter = osterambuf_iterator<CharT>> class num_put;
        template <class CharT> class numpunct;
        template <class CharT> class numpunct_byname;

        // collation:
        template <class CharT> class collate;
        template <class CharT> class collate_byname;

        // date and time:
        class time_base;
        template <class CharT, class InputIter = istreambuf_iterator<CharT>>
            class time_get;
        template <class CharT, class InputIter> = istreambuf_iterator<CharT>>
            class time_get_byname;
        template <class CharT, class OutputIter> = ostreambuf_iterator<CharT>>
            class time_put;
        template <class CharT, class OutputIter> = ostreambuf_iterator<CharT>>
            class time_put_byname;

        // money:
        class money_base;
        template <class CharT, class InputIter = istreambuf_iterator<CharT>> >
            class money_get;
        template <class CharT, class OutputIter = ostreambuf_iterator<CharT>> >
            class money_put;
        template <class CharT, bool Intl = false> class moneypunct;
        template <class CharT, bool Intl = false> class moneypunct_byname;

        // message retrieval:
        class messages_base;
        template <class CharT> class messages;
        template <class CharT> class messages_byname;
    }

#### Class std::locale

    class locale
    {
    public:
        // types:
        class facet;
        class id;
        typedef int category;
        static const category // values assigned here are for exposition only
            none     = 0,
            collate  = 0x010,
            ctype    = 0x020,
            monetary = 0x040,
            numeric  = 0x080,
            time     = 0x100,
            messages = 0x200,
            all = collate | ctype | monetary | numeric | time | messages;

        // construct/copy/destroy:
        locale() noexcept;
        locale(const locale& other) noexcept;
        explicit locale(const char* std_name);
        explicit locale(const string& std_name);
        locale(const locale& other, const char* std_name, category);
        locale(const locale& other, const string& std_name, category);
        template <class Facet> locale(const locale& other, Facet* f);
        locale(const locale& other, const locale& one, category);
        ~locale();

        // not virtual
        const locale& operator=(const locale& other) noexcept;
        template <class Facet> locale combine(const locale& other) const;

        // locale operations:
        basic_string<char>
        name() const;
        bool operator==(const locale& other) const;
        bool operator!=(const locale& other) const;
        template <class CharT, class Traits, class Allocator>
        bool operator()(const basic_string<CharT,Traits,Allocator>& s1,
                        const basic_string<CharT,Traits,Allocator>& s2) const;

        // global locale objects:
        static
        locale global(const locale&);
        static const locale& classic();
    };

#### Class std::ctype_base

    class ctype_base
    {
    public:
        typedef /*bitmask-type*/ mask;

        // numeric values are for exposition only.
        static const mask space = 1 << 0;
        static const mask print = 1 << 1;
        static const mask cntrl = 1 << 2;
        static const mask upper = 1 << 3;
        static const mask lower = 1 << 4;
        static const mask alpha = 1 << 5;
        static const mask digit = 1 << 6;
        static const mask punct = 1 << 7;
        static const mask xdigit= 1 << 8;
        static const mask blank = 1 << 9;
        static const mask alnum = alpha | digit;
        static const mask graph = alnum | punct;
    };

#### Class std::ctype

    template <class CharT>
    class ctype : public locale::facet, public ctype_base
    {
    public:
        typedef CharT char_type;

        explicit ctype(size_t refs = 0);

        bool is(mask m, CharT c) const;
        const CharT* is(const CharT* low, const CharT* high, mask* vec) const;
        const CharT* scan_is(mask m,
                             const CharT* low, const CharT* high) const;
        const CharT* scan_not(mask m,
                              const CharT* low, const CharT* high) const;

        CharT        toupper(CharT c) const;
        const CharT* toupper(CharT* low, const CharT* high) const;
        CharT        tolower(CharT c) const;
        const CharT* tolower(CharT* low, const CharT* high) const;

        CharT        widen(char c) const;
        const char*  widen(const char* low, const char* high, CharT* to) const;
        char         narrow(CharT c, char dfault) const;
        const CharT* narrow(const CharT* low, const CharT*, char dfault,
                            char* to) const;

        static locale::id id;

    protected:
        ~ctype();
        virtual bool do_is(mask m, CharT c) const;
        virtual const CharT* do_is(const CharT* low, const CharT* high,
                                   mask* vec) const;
        virtual const CharT* do_scan_is(mask m,
                                        const CharT* low, const CharT* high) const;
        virtual const CharT* do_scan_not(mask m,
                                         const CharT* low, const CharT* high) const;

        virtual CharT do_toupper(CharT) const;
        virtual const CharT* do_toupper(CharT* low, const CharT* high) const;
        virtual CharT do_tolower(CharT) const;
        virtual const CharT* do_tolower(CharT* low, const CharT* high) const;
        virtual CharT do_widen(char) const;
        virtual const char*  do_widen(const char* low, const char* high,
                                      CharT* dest) const;
        virtual char do_narrow(CharT, char dfault) const;
        virtual const CharT* do_narrow(const CharT* low, const CharT* high,
                                       char dfault, char* dest) const;
    };

#### Class std::ctype_byname

    template <class CharT>
    class ctype_byname : public ctype<CharT>
    {
    public:
        typedef typename ctype<CharT>::mask mask;
        explicit ctype_byname(const char*, size_t refs = 0);
        explicit ctype_byname(const string&, size_t refs = 0);
        protected:
        ~ctype_byname();
    };

#### Class std::ctype<char>

    template <> class ctype<char>
        : public locale::facet, public ctype_base
    {
    public:
        typedef char char_type;
        explicit ctype(const mask* tab = 0, bool del = false,
                       size_t refs = 0);
        bool is(mask m, char c) const;
        const char* is(const char* low, const char* high, mask* vec) const;
        const char* scan_is (mask m,
                             const char* low, const char* high) const;
        const char* scan_not(mask m,
                             const char* low, const char* high) const;
        char        toupper(char c) const;
        const char* toupper(char* low, const char* high) const;
        char        tolower(char c) const;
        const char* tolower(char* low, const char* high) const;
        char        widen(char c) const;
        const char* widen(const char* low, const char* high, char* to) const;
        char        narrow(char c, char dfault) const;
        const char* narrow(const char* low, const char* high, char dfault,
                           char* to) const;

        static locale::id id;

        static const size_t table_size = /* implementation-defined */;
        const mask* table() const noexcept;
        static const mask* classic_table() noexcept;

    protected:
        ~ctype();
        virtual char        do_toupper(char c) const;
        virtual const char* do_toupper(char* low, const char* high) const;
        virtual char        do_tolower(char c) const;
        virtual const char* do_tolower(char* low, const char* high) const;
        virtual char        do_widen(char c) const;
        virtual const char* do_widen(const char* low,
                                     const char* high,
                                     char* to) const;
        virtual char        do_narrow(char c, char dfault) const;
        virtual const char* do_narrow(const char* low,
                                      const char* high,
                                      char dfault, char* to) const;
    };

#### Class std::codecvt_base

    class codecvt_base
    {
    public:
        enum result { ok, partial, error, noconv };
    };

#### Class std::codecvt

    template <class internT, class externT, class stateT>
    class codecvt : public locale::facet, public codecvt_base
    {
    public:
        typedef internT intern_type;
        typedef externT extern_type;
        typedef stateT state_type;
        explicit codecvt(size_t refs = 0);
        result out(stateT& state,
                   const internT* from, const internT* from_end,
                   const internT*& from_next,
                   externT* to, externT* to_end, externT*& to_next) const;
        result unshift(stateT& state, externT* to,
                       externT* to_end, externT*& to_next) const;
        result in(stateT& state,
                  const externT* from, const externT* from_end,
                  const externT*& from_next,
                  internT* to,
                  internT* to_end, internT*& to_next) const;
        int encoding() const noexcept;
        bool always_noconv() const noexcept;
        int length(stateT&, const externT* from, const externT* end,
                   size_t max) const;
        int max_length() const noexcept;
        static locale::id id;
    protected:
        ~codecvt();
        virtual result do_out(stateT& state,
                              const internT* from, const internT* from_end,
                              const internT*& from_next,
                              externT* to,
                              externT* to_end, externT*& to_next) const;
        virtual result do_in(stateT& state,
                             const externT* from, const externT* from_end,
                             const externT*& from_next,
                             internT* to,
                             internT* to_end, internT*& to_next) const;
        virtual result do_unshift(stateT& state,
                                  externT* to,
                                  externT* to_end, externT*& to_next) const;
        virtual int do_encoding() const noexcept;
        virtual bool do_always_noconv() const noexcept;
        virtual int do_length(stateT&, const externT* from,
                              const externT* end, size_t max) const;
        virtual int do_max_length() const noexcept;
    };

#### Class std::codecvt_byname

    template <class internT, class externT, class stateT>
    class codecvt_byname : public codecvt<internT, externT, stateT>
    {
    public:
        explicit codecvt_byname(const char*, size_t refs = 0);
        explicit codecvt_byname(const string&, size_t refs = 0);
    protected:
        ~codecvt_byname();
    };

#### Class std::num_get

    template <class CharT, class InputIter = istreambuf_iterator<CharT>>
    class num_get : public locale::facet
    {
    public:
        typedef CharT           char_type;
        typedef InputIter   iter_type;
        explicit num_get(size_t refs = 0);
        iter_type get(iter_type in, iter_type end, ios_base&,
                      ios_base::iostate& err, bool& v) const;
        iter_type get(iter_type in, iter_type end, ios_base&,
                      ios_base::iostate& err, long& v) const;
        iter_type get(iter_type in, iter_type end, ios_base&,
                      ios_base::iostate& err, long long& v) const;
        iter_type get(iter_type in, iter_type end, ios_base&,
                      ios_base::iostate& err, unsigned short& v) const;
        iter_type get(iter_type in, iter_type end, ios_base&,
                      ios_base::iostate& err, unsigned int& v) const;
        iter_type get(iter_type in, iter_type end, ios_base&,
                      ios_base::iostate& err, unsigned long& v) const;
        iter_type get(iter_type in, iter_type end, ios_base&,
                      ios_base::iostate& err, unsigned long long& v) const;
        iter_type get(iter_type in, iter_type end, ios_base&,
                      ios_base::iostate& err, float& v) const;
        iter_type get(iter_type in, iter_type end, ios_base&,
                      ios_base::iostate& err, double& v) const;
        iter_type get(iter_type in, iter_type end, ios_base&,
                      ios_base::iostate& err, long double& v) const;
        iter_type get(iter_type in, iter_type end, ios_base&,
                      ios_base::iostate& err, void*& v) const;

        static locale::id id;

    protected:
        ~num_get();

        virtual iter_type do_get(iter_type, iter_type, ios_base&,
                                 ios_base::iostate& err, bool& v) const;
        virtual iter_type do_get(iter_type, iter_type, ios_base&,
                                 ios_base::iostate& err, long& v) const;
        virtual iter_type do_get(iter_type, iter_type, ios_base&,
                                 ios_base::iostate& err, long long& v) const;
        virtual iter_type do_get(iter_type, iter_type, ios_base&,
                                 ios_base::iostate& err, unsigned short& v) const;
        virtual iter_type do_get(iter_type, iter_type, ios_base&,
                                 ios_base::iostate& err, unsigned int& v) const;
        virtual iter_type do_get(iter_type, iter_type, ios_base&,
                                 ios_base::iostate& err, unsigned long& v) const;
        virtual iter_type do_get(iter_type, iter_type, ios_base&,
                                 ios_base::iostate& err, unsigned long long& v) const;
        virtual iter_type do_get(iter_type, iter_type, ios_base&,
                                 ios_base::iostate& err, float& v) const;
        virtual iter_type do_get(iter_type, iter_type, ios_base&,
                                 ios_base::iostate& err, double& v) const;
        virtual iter_type do_get(iter_type, iter_type, ios_base&,
                                 ios_base::iostate& err, long double& v) const;
        virtual iter_type do_get(iter_type, iter_type, ios_base&,
                                 ios_base::iostate& err, void*& v) const;
    };

#### Class std::num_put

    template <class CharT, class OutputIter = ostreambuf_iterator<CharT>>
    class num_put : public locale::facet
    {
    public:
        typedef CharT char_type;
        typedef OutputIter iter_type;

        explicit num_put(size_t refs = 0);

        iter_type put(iter_type s, ios_base& f, char_type fill,
                      bool v) const;
        iter_type put(iter_type s, ios_base& f, char_type fill,
                      long v) const;
        iter_type put(iter_type s, ios_base& f, char_type fill,
                      long long v) const;
        iter_type put(iter_type s, ios_base& f, char_type fill,
                      unsigned long v) const;
        iter_type put(iter_type s, ios_base& f, char_type fill,
                      unsigned long long v) const;
        iter_type put(iter_type s, ios_base& f, char_type fill,
                      double v) const;
        iter_type put(iter_type s, ios_base& f, char_type fill,
                      long double v) const;
        iter_type put(iter_type s, ios_base& f, char_type fill,
                      const void* v) const;

        static locale::id id;

    protected:
        ~num_put();

        virtual iter_type do_put(iter_type, ios_base&, char_type fill,
                                 bool v) const;
        virtual iter_type do_put(iter_type, ios_base&, char_type fill,
                                 long v) const;
        virtual iter_type do_put(iter_type, ios_base&, char_type fill,
                                 long long v) const;
        virtual iter_type do_put(iter_type, ios_base&, char_type fill,
                                 unsigned long) const;
        virtual iter_type do_put(iter_type, ios_base&, char_type fill,
                                 unsigned long long) const;
        virtual iter_type do_put(iter_type, ios_base&, char_type fill,
                                 double v) const;
        virtual iter_type do_put(iter_type, ios_base&, char_type fill,
                                 long double v) const;
        virtual iter_type do_put(iter_type, ios_base&, char_type fill,
                                 const void* v) const;
    };

#### Class std::numpunct

    template <class CharT>
    class numpunct : public locale::facet
    {
    public:
        typedef CharT char_type;
        typedef basic_string<CharT> string_type;

        explicit numpunct(size_t refs = 0);

        char_type   decimal_point() const;
        char_type   thousands_sep() const;
        string      grouping()      const;
        string_type truename()      const;
        string_type falsename()     const;

        static locale::id id;

    protected:
        ~numpunct(); // virtual

        virtual char_type   do_decimal_point() const;
        virtual char_type   do_thousands_sep() const;
        virtual string      do_grouping()      const;
        virtual string_type do_truename()      const; // for bool
        virtual string_type do_falsename()     const; // for bool
    };

#### Class std::numpunct_byname

    template <class CharT>
    class numpunct_byname : public numpunct<CharT>
    {
    public:
        typedef CharT char_type;
        typedef basic_string<CharT> string_type;

        explicit numpunct_byname(const char*, size_t refs = 0);
        explicit numpunct_byname(const string&, size_t refs = 0);

    protected:
        ~numpunct_byname();
    };

#### Class std::collate

    template <class CharT>
    class collate : public locale::facet
    {
    public:
        typedef CharT char_type;
        typedef basic_string<CharT> string_type;

        explicit collate(size_t refs = 0);

        int compare(const CharT* low1, const CharT* high1,
                    const CharT* low2, const CharT* high2) const;
        string_type transform(const CharT* low, const CharT* high) const;
        long hash(const CharT* low, const CharT* high) const;

        static locale::id id;

    protected:
        ~collate();

        virtual int do_compare(const CharT* low1, const CharT* high1,
                               const CharT* low2, const CharT* high2) const;
        virtual string_type do_transform(const CharT* low,
                                         const CharT* high) const;
        virtual long do_hash (const CharT* low, const CharT* high) const;
    };

#### Class std::collate_byname

    template <class CharT>
    class collate_byname : public collate<CharT>
    {
    public:
        typedef basic_string<CharT> string_type;

        explicit collate_byname(const char*, size_t refs = 0);
        explicit collate_byname(const string&, size_t refs = 0);

    protected:
        ~collate_byname();
    };

#### Class std::time_base

    class time_base
    {
    public:
        enum dateorder { no_order, dmy, mdy, ymd, ydm };
    };

#### Class std::time_get

    template <class CharT, class InputIter = istreambuf_iterator<CharT>>
    class time_get : public locale::facet, public time_base
    {
    public:
        typedef CharT char_type;
        typedef InputIter iter_type;

        explicit time_get(size_t refs = 0);

        dateorder date_order() const;
        iter_type get_time(iter_type s, iter_type end, ios_base& f,
                           ios_base::iostate& err, tm* t) const;
        iter_type get_date(iter_type s, iter_type end, ios_base& f,
                           ios_base::iostate& err, tm* t) const;
        iter_type get_weekday(iter_type s, iter_type end, ios_base& f,
                              ios_base::iostate& err, tm* t) const;
        iter_type get_monthname(iter_type s, iter_type end, ios_base& f,
                                ios_base::iostate& err, tm* t) const;
        iter_type get_year(iter_type s, iter_type end, ios_base& f,
                           ios_base::iostate& err, tm* t) const;
        iter_type get(iter_type s, iter_type end, ios_base& f,
                      ios_base::iostate& err, tm* t, char format,
                      char modifier = 0) const;
        iter_type get(iter_type s, iter_type end, ios_base& f,
                      ios_base::iostate& err, tm* t,
                      const char_type* fmt, const char_type* fmtend) const;

        static locale::id id;

    protected:
        ~time_get();

        virtual dateorder do_date_order() const;
        virtual iter_type do_get_time(iter_type s, iter_type end, ios_base&,
                                      ios_base::iostate& err, tm* t) const;
        virtual iter_type do_get_date(iter_type s, iter_type end, ios_base&,
                                      ios_base::iostate& err, tm* t) const;
        virtual iter_type do_get_weekday(iter_type s, iter_type end, ios_base&,
                                         ios_base::iostate& err, tm* t) const;
        virtual iter_type do_get_monthname(iter_type s, iter_type end, ios_base&,
                                           ios_base::iostate& err, tm* t) const;
        virtual iter_type do_get_year(iter_type s, iter_type end, ios_base&,
                                      ios_base::iostate& err, tm* t) const;
        virtual iter_type do_get(iter_type s, iter_type end, ios_base& f,
                                 ios_base::iostate& err, tm* t,
                                 char format, char modifier) const;
    };

#### Class std::time_get_byname

    template <class CharT, class InputIter = istreambuf_iterator<CharT>>
    class time_get_byname : public time_get<CharT, InputIter>
    {
    public:
        typedef time_base::dateorder dateorder;
        typedef InputIter iter_type;

        explicit time_get_byname(const char*, size_t refs = 0);
        explicit time_get_byname(const string&, size_t refs = 0);

    protected:
        ~time_get_byname();
    };

#### Class std::time_put

    template <class CharT, class OutputIter = ostreambuf_iterator<CharT>>
    class time_put : public locale::facet
    {
    public:
        typedef CharT char_type;
        typedef OutputIter iter_type;

        explicit time_put(size_t refs = 0);

        // the following is implemented in terms of other member functions.
        iter_type put(iter_type s, ios_base& f, char_type fill, const tm* tmb,
                      const CharT* pattern, const CharT* pat_end) const;
        iter_type put(iter_type s, ios_base& f, char_type fill,
                      const tm* tmb, char format, char modifier = 0) const;

        static locale::id id;

    protected:
        ~time_put();

        virtual iter_type do_put(iter_type s, ios_base&, char_type, const tm* t,
                                 char format, char modifier) const;
    };

#### Class std::time_put_byname

    template <class CharT, class OutputIter = ostreambuf_iterator<CharT>>
    class time_put_byname : public time_put<CharT, OutputIter>
    {
    public:
        typedef CharT char_type;
        typedef OutputIter iter_type;

        explicit time_put_byname(const char*, size_t refs = 0);
        explicit time_put_byname(const string&, size_t refs = 0);

    protected:
        ~time_put_byname();
    };

#### Class std::money_get

    template <class CharT, class InputIter = istreambuf_iterator<CharT>>
    class money_get : public locale::facet
    {
    public:
        typedef CharT char_type;
        typedef InputIter iter_type;
        typedef basic_string<CharT> string_type;

        explicit money_get(size_t refs = 0);

        iter_type get(iter_type s, iter_type end, bool intl, ios_base& f,
                      ios_base::iostate& err, long double& units) const;
        iter_type get(iter_type s, iter_type end, bool intl, ios_base& f,
                      ios_base::iostate& err, string_type& digits) const;

        static locale::id id;

    protected:
        ~money_get();

        virtual iter_type do_get(iter_type, iter_type, bool, ios_base&,
                                 ios_base::iostate& err,
                                 long double& units) const;
        virtual iter_type do_get(iter_type, iter_type, bool, ios_base&,
                                 ios_base::iostate& err,
                                 string_type& digits) const;
    };

#### Class std::money_put

    template <class CharT, class OutputIter = ostreambuf_iterator<CharT>>
    class money_put : public locale::facet
    {
    public:
        typedef CharT char_type;
        typedef OutputIter iter_type;
        typedef basic_string<CharT> string_type;

        explicit money_put(size_t refs = 0);

        iter_type put(iter_type s, bool intl, ios_base& f,
                      char_type fill, long double units) const;
        iter_type put(iter_type s, bool intl, ios_base& f,
                      char_type fill, const string_type& digits) const;

        static locale::id id;

    protected:
        ~money_put();

        virtual iter_type do_put(iter_type, bool, ios_base&, char_type fill,
                                 long double units) const;
        virtual iter_type do_put(iter_type, bool, ios_base&, char_type fill,
                                 const string_type& digits) const;
    };

#### Class std::money_base

    class money_base
    {
    public:
        enum part { none, space, symbol, sign, value };
        struct pattern { char field[4]; };
    };

#### Class std::moneypunct

    template <class CharT, bool International = false>
    class moneypunct : public locale::facet, public money_base
    {
    public:
        typedef CharT char_type;
        typedef basic_string<CharT> string_type;

        explicit moneypunct(size_t refs = 0);

        CharT       decimal_point() const;
        CharT       thousands_sep() const;
        string      grouping()      const;
        string_type curr_symbol()   const;
        string_type positive_sign() const;
        string_type negative_sign() const;
        int         frac_digits()   const;
        pattern     pos_format()    const;
        pattern     neg_format()    const;

        static locale::id id;
        static const bool intl = International;

    protected:
        ~moneypunct();

        virtual CharT       do_decimal_point() const;
        virtual CharT       do_thousands_sep() const;
        virtual string      do_grouping()      const;
        virtual string_type do_curr_symbol()   const;
        virtual string_type do_positive_sign() const;
        virtual string_type do_negative_sign() const;
        virtual int         do_frac_digits()   const;
        virtual pattern     do_pos_format()    const;
        virtual pattern     do_neg_format()    const;
    };

#### Class std::moneypunct_byname

    template <class CharT, bool Intl = false>
    class moneypunct_byname : public moneypunct<CharT, Intl>
    {
    public:
        typedef money_base::pattern pattern;
        typedef basic_string<CharT> string_type;

        explicit moneypunct_byname(const char*, size_t refs = 0);
        explicit moneypunct_byname(const string&, size_t refs = 0);

    protected:
        ~moneypunct_byname();
    };

#### Class std::messages_base

    class messages_base
    {
    public:
        typedef /* unspecified signed integer type */ catalog;
    };

#### Class std::messages

    template <class CharT>
    class messages : public locale::facet, public messages_base {
    public:
        typedef CharT char_type;
        typedef basic_string<CharT> string_type;

        explicit messages(size_t refs = 0);

        catalog open(const basic_string<char>& fn, const locale&) const;
        string_type get(catalog c, int set, int msgid,
                        const string_type& dfault) const;
        void close(catalog c) const;

        static locale::id id;

    protected:
        ~messages();

        virtual catalog do_open(const basic_string<char>&, const locale&) const;
        virtual string_type do_get(catalog, int set, int msgid,
                                   const string_type& dfault) const;
        virtual void do_close(catalog) const;
    };

#### Class std::messages_byname

    template <class CharT>
    class messages_byname : public messages<CharT>
    {
    public:
        typedef messages_base::catalog catalog;
        typedef basic_string<CharT> string_type;

        explicit messages_byname(const char*, size_t refs = 0);
        explicit messages_byname(const string&, size_t refs = 0);

    protected:
        ~messages_byname();
    };

#### Class std::wstring_convert

    template<class Codecvt, class Elem = wchar_t,
        class Wide_alloc = std::allocator<Elem>,
        class Byte_alloc = std::allocator<char>>
    class wstring_convert
    {
    public:
        typedef std::basic_string<char, char_traits<char>, Byte_alloc> byte_string;
        typedef std::basic_string<Elem, char_traits<Elem>, Wide_alloc> wide_string;
        typedef typename Codecvt::state_type state_type;
        typedef typename wide_string::traits_type::int_type int_type;

        explicit wstring_convert(Codecvt* pcvt = new Codecvt);
        wstring_convert(Codecvt* pcvt, state_type state);
        explicit wstring_convert(const byte_string& byte_err,
                                 const wide_string& wide_err = wide_string());
        ~wstring_convert();

        wstring_convert(const wstring_convert&) = delete;
        wstring_convert& operator=(const wstring_convert&) = delete;

        wide_string from_bytes(char byte);
        wide_string from_bytes(const char* ptr);
        wide_string from_bytes(const byte_string& str);
        wide_string from_bytes(const char* first, const char* last);
        byte_string to_bytes(Elem wchar);
        byte_string to_bytes(const Elem* wptr);
        byte_string to_bytes(const wide_string& wstr);
        byte_string to_bytes(const Elem* first, const Elem* last);
        size_t converted() const noexcept;
        state_type state() const;

    private:
        byte_string byte_err_string; // exposition only
        wide_string wide_err_string; // exposition only
        Codecvt* cvtptr;             // exposition only
        state_type cvtstate;         // exposition only
        size_t cvtcount;             // exposition only
    };

#### Class std::wbuffer_convert

    template<class Codecvt,
        class Elem = wchar_t,
        class Tr = std::char_traits<Elem>>
    class wbuffer_convert : public std::basic_streambuf<Elem, Tr>
    {
    public:
        typedef typename Codecvt::state_type state_type;

        explicit wbuffer_convert(std::streambuf* bytebuf = 0,
                                 Codecvt* pcvt = new Codecvt,
                                 state_type state = state_type());
        ~wbuffer_convert();

        wbuffer_convert(const wbuffer_convert&) = delete;
        wbuffer_convert& operator=(const wbuffer_convert&) = delete;

        std::streambuf* rdbuf() const;
        std::streambuf* rdbuf(std::streambuf* bytebuf);
        state_type state() const;
    private:
        std::streambuf* bufptr; // exposition only
        Codecvt* cvtptr;        // exposition only
        state_type cvtstate;    // exposition only
    };

### Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

DR | Applied to | Behavior as published | Correct behavior
--- | --- | --- | ---
LWG 71 | C++98 | the parameter end of `time_get::do_get_monthname` was missing in the synopsis | added
LWG 75 | C++98 | the type of the parameter state of members `length` and `do_length` of `codecvt` and `codecvt_byname` was const stateT& in the synopsis | corrected to stateT&
LWG 124 | C++98 | the return types of members `do_scan_is` and `do_scan_not` of `codecvt_byname` were const char* in the synopsis | corrected to const charT*
LWG 228 | C++98 | all virtual member functions of `XXX_byname` facets were listed in the synopses | only lists the desctuctor (removed all other virtual member functions)
LWG 268 | C++98 | the semicolons following the declarations of the default constructor and copy constructor of std::locale were missing in the synopsis | added
LWG 1298 | C++98 | there was an explicit specialization `ctype_byname`<char> in the synopsis | removed

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