regex_traits Class
Describes characteristics of elements for matching.
template<class Elem>
struct regex_traits {
regex_traits();
static size_type length(const char_type *str);
char_type translate(char_type ch) const;
char_type translate_nocase(char_type ch) const;
template<class FwdIt>
string_type transform(FwdIt first, FwdIt last) const;
template<class FwdIt>
string_type transform_primary(FwdIt first, FwdIt last) const;
template<class FwdIt>
char_class_type lookup_classname(FwdIt first, FwdIt last) const;
template<class FwdIt>
string_type lookup_collatename(FwdIt first, FwdIt last) const;
bool isctype(char_type ch, char_class_type cls) const;
int value(Elem ch, int base) const;
locale_type imbue(locale_type loc);
locale_type getloc() const;
typedef Elem char_type;
typedef T6 size_type;
typedef basic_string<Elem> string_type;
typedef T7 locale_type;
typedef T8 char_class_type;
};
Parameters
- Elem
The element type to describe.
Remarks
The template class describes various regular expression traits for type Elem. The template class basic_regex Class uses this information to manipulate elements of type Elem.
Each regex_traits object holds an object of type regex_traits::locale which is used by some of its member functions. The default locale is a copy of regex_traits::locale(). The member function imbue replaces the locale object, and the member function getloc returns a copy of the locale object.
Requirements
Header: <regex>
Namespace: std