...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
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.