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std::regex_traits(3)	       C++ Standard Libary	    std::regex_traits(3)

NAME
     std::regex_traits - std::regex_traits

Synopsis
	Defined in header <regex>
	template< class CharT >    (since C++11)
	class regex_traits;

	The  type trait template regex_traits supplies std::basic_regex with the
     set of types
	and functions necessary to operate on the type CharT.

	Since many of regex operations are locale-sensitive (when
	std::regex_constants::collate flag is set), the regex_traits class typi-
     cally holds
	an instance of a std::locale as a private member.

Standard specializations
	Two specializations of std::regex_traits are defined by the standard li-
     brary:

	std::regex_traits<char>
	std::regex_traits<wchar_t>

	These specializations make it  possible  to  use  std::basic_regex<char>
     (aka
	std::regex)  and  std::basic_regex<wchar_t>  (aka  std::wregex).  To use
     std::basic_regex
	with other character types  (for  example,  char32_t),	a  user-provided
     trait class must
	be used.

Member types
	Type		Definition
	char_type	CharT
	string_type	std::basic_string<CharT>
	locale_type	 The  locale  used for localized behavior in the regular
     expression.
			Must be CopyConstructible
			Represents a character classification and is capable  of
     holding an
	char_class_type  implementation  specific  set returned by lookup_class-
     name. Must be a
			BitmaskType.

Member functions
	constructor	   constructs the regex_traits object
			   (public member function)
	length		   calculates the length of a null-terminated  character
     string
	[static]	   (public static member function)
	translate	   determines the equivalence key for a character
			   (public member function)
	translate_nocase   determines the case-insensitive equivalence key for a
     character
			   (public member function)
			   determines the sort key for the given string, used to
     provide
	transform	   collation order
			   (public member function)
			   determines the primary sort key for the character se-
     quence, used
	transform_primary  to determine equivalence class
			   (public member function)
	lookup_collatename gets a collation element by name
			   (public member function)
	lookup_classname   gets a character class by name
			   (public member function)
	isctype 	   indicates membership in a localized character class
			   (public member function)
			   translates the character representing a numeric digit
     into an
	value		   integral value
			   (public member function)
	imbue		   sets the locale
			   (public member function)
	getloc		   gets the locale
			   (public member function)

http://cppreference.com 	   2024.06.10		    std::regex_traits(3)
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