std:: regex_traits
|
Defined in header
<regex>
|
||
|
template
<
class
CharT
>
class regex_traits ; |
(since C++11) | |
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 regular expression. Must be CopyConstructible |
char_class_type
|
Represents a character classification and is capable of holding an implementation specific set returned by
lookup_classname
. Must be a
BitmaskType
.
|
Member functions
|
constructs the regex_traits object
(public member function) |
|
|
[static]
|
calculates the length of a null-terminated character string
(public static member function) |
|
determines the equivalence key for a character
(public member function) |
|
|
determines the case-insensitive equivalence key for a character
(public member function) |
|
|
determines the sort key for the given string, used to provide collation order
(public member function) |
|
|
determines the primary sort key for the character sequence, used to determine equivalence class
(public member function) |
|
|
gets a collation element by name
(public member function) |
|
|
gets a character class by name
(public member function) |
|
|
indicates membership in a localized character class
(public member function) |
|
|
translates the character representing a numeric digit into an integral value
(public member function) |
|
|
sets the locale
(public member function) |
|
|
gets the locale
(public member function) |