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This is an older version of Boost and was released in 2024. The current version is 1.89.0.
boost::parser::rule
// In header: <boost/parser/parser_fwd.hpp> template<typename TagType, typename Attribute = no_attribute, typename LocalState = no_local_state, typename ParamsTuple = no_params> struct rule { };
A type used to declare named parsing rules. The TagType template parameter is used to associate a particular rule with the rule_parser used during parsing.