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Boost::Spirit::Qi Auto-rules and conditional actions
struct GenderTally
{
 std::vector<std::string> males;
 std::vector<std::string> females;
};

m:Steve;
f:Dora;
f:Martha;
m:Joe;
...

BOOST_FUSION_ADAPT_STRUCT(
    GenderTally,
    (std::vector<std::string>, males)
    (std::vector<std::string>, females)
);

rule<Iterator, std::string()> r = +alnum;
rule<Iterator, GenderTally()> g =
    *(   ("f:" >> r)[phx::push_back(at_c<0>(_val), _1)]
     |   ("m:" >> r)[phx::push_back(at_c<1>(_val), _1)]
     );

struct Gender {
    char gender;
    std::string name;
};

typedef std::vector<Gender> GenderTally;

BOOST_FUSION_ADAPT_STRUCT(
    Gender,
    (char, gender)
    (std::string, name)
);

rule<Iterator, std::string()> r = +alnum;
rule<Iterator, GenderTally()> g = *(char_('f') >> ':' >> r | char_('m') >> ':' >> r);