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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
       typically holds
	  an instance of a std::locale as a private member.

Standard specializations
	  Two specializations of std::regex_traits are defined by the standard
       library:

	  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 regu-
       lar expression.
			  Must be CopyConstructible
			  Represents a character classification	and is capable
       of holding an
	  char_class_type   implementation   specific	 set	returned    by
       lookup_classname. Must be a
			  BitmaskType.

Member functions
	  constructor	     constructs	the regex_traits object
			     (public member function)
	  length	      calculates the length of a null-terminated char-
       acter 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
       sequence, 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		  2022.07.31		  std::regex_traits(3)

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