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This is an older version of Boost and was released in 2024. The current version is 1.91.0.
boost::parser::char_subrange_parser
// In header: <boost/parser/parser_fwd.hpp> template<typename Tag> struct char_subrange_parser { };
Matches a single code point that falls into one of the subranges of code points associated with tag type Tag. This is used to create sets of characters for matching Unicode character classes like hex digits or control characters. Attribute type is the attribute type of the character being matched.