std::regex_traits
From cppreference.com
| Defined in header <regex>
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template< class CharT >
class regex_traits;
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(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>
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std::regex_traits<wchar_t>
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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
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CharT
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string_type
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std::basic_string<CharT>
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locale_type
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The locale used for localized behavior in the regular expression. Must be CopyConstructible |
char_class_type
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Represents a character classification and is capable of holding an implementation specific set returned by lookup_classname. Must be a BitmaskType.
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