namespace std {
template<class charT>
class ctype : public locale::facet, public ctype_base {
public:
using char_type = charT;
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* high, 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
ctype encapsulates the C library
features
.istream
members are required to use
ctype<>
for character classing during input parsing
. The specializations required in Table
102 (
[locale.category]), namely
ctype<char>
and
ctype<wchar_t>,
implement character classing appropriate
to the implementation's native character set
.