std::regex_traits
STD：：regex[医]性状
| Defined in header | | |
|---|---|---|
| template< class CharT > class regex_traits; | | (since C++11) |
类型性状模板regex_traits供应品std::basic_regex具有对该类型进行操作所需的类型和函数集。CharT...
因为许多regex操作都是对地区敏感的%28，所以std::regex_constants::collate标志设置为%29，正则表达式[医]属性类通常包含std::locale作为私人成员。
标准专业化
两个专门化std::regex_traits由标准库定义：
STD：：regex[医]性状<char>
*。
STD：：regex[医]性状<wchar[医]T>
这些专门化使使用成为可能。std::basic_regex<char>百分之二十八std::regex29%和std::basic_regex<wchar_t>百分之二十八std::wregex29%。使用std::basic_regex例如，对于其他字符类型%28，char32_t%29，必须使用用户提供的特性类.
成员类型
| 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. |
成员函数
| (constructor) | constructs the regex_traits object (public member function) |
|---|---|
| length static | calculates the length of a null-terminated character string (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) |
| transform | determines the sort key for the given string, used to provide collation order (public member function) |
| transform_primary | determines the primary sort key for the character sequence, used 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) |
| value | translates the character representing a numeric digit into an integral value (public member function) |
| imbue | sets the locale (public member function) |
| getloc | gets the locale (public member function) |
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