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boost::parser::prefix_parse
// In header: <boost/parser/parser.hpp> template<parsable_iter I, std::sentinel_for< I > S, typename Parser, typename GlobalState, error_handler< I, S, GlobalState > ErrorHandler, typename SkipParser> auto prefix_parse(I & first, S last, parser_interface< Parser, GlobalState, ErrorHandler > const & parser, parser_interface< SkipParser > const & skip, trace trace_mode = trace::off);
Parses [first, last) using parser, skipping all input recognized by skip between the application of any two parsers. Returns a std::optional containing the attribute produced by parser on parse success, and std::nullopt on parse failure. If trace_mode == trace::on, a verbose trace of the parse will be streamed to std::cout.