auto generate serializers and deserializers

derive-json.hpp

//https://stackoverflow.com/questions/24309309/how-to-use-boost-preprocessor-to-generate-accessors

#include <boost/preprocessor.hpp>

#define CREATE_MY_MACRO_PLACEHOLDER_FILLER_0(X, Y, Z)  \
    ((X, Y, Z)) CREATE_MY_MACRO_PLACEHOLDER_FILLER_1
#define CREATE_MY_MACRO_PLACEHOLDER_FILLER_1(X, Y, Z)  \
    ((X, Y, Z)) CREATE_MY_MACRO_PLACEHOLDER_FILLER_0
#define CREATE_MY_MACRO_PLACEHOLDER_FILLER_0_END
#define CREATE_MY_MACRO_PLACEHOLDER_FILLER_1_END

#define DECLARE_DATA_MEMBER(R, _, TYPE_AND_NAME) \
    BOOST_PP_TUPLE_ELEM(3, 0, TYPE_AND_NAME) BOOST_PP_TUPLE_ELEM(3, 1, TYPE_AND_NAME);

#define DEFINE_SERIALIZATION_ELEMENT(R, _, TYPE_AND_NAME) \
    { BOOST_PP_TUPLE_ELEM(3, 2, TYPE_AND_NAME), o.BOOST_PP_TUPLE_ELEM(3, 1, TYPE_AND_NAME) },

#define DEFINE_DESERIALIZATION_ELEMENT(R, _, TYPE_AND_NAME) \
    o.BOOST_PP_TUPLE_ELEM(3, 1, TYPE_AND_NAME) = j.at(BOOST_PP_TUPLE_ELEM(3, 2, TYPE_AND_NAME)).get<BOOST_PP_TUPLE_ELEM(3, 0, TYPE_AND_NAME)>();

#define DEFINE_EQUAL_OPERATOR_ELEM(R, _, TYPE_AND_NAME) \
    lhs.BOOST_PP_TUPLE_ELEM(3, 1, TYPE_AND_NAME) == rhs.BOOST_PP_TUPLE_ELEM(3, 1, TYPE_AND_NAME) &&

#define DEFINE_MODEL(NAME, TYPES_AND_NAMES) \
struct NAME { \
BOOST_PP_SEQ_FOR_EACH(DECLARE_DATA_MEMBER, _, BOOST_PP_CAT(CREATE_MY_MACRO_PLACEHOLDER_FILLER_0 TYPES_AND_NAMES,_END)) \
}; \
void to_json(json& j, const NAME& o) { \
    j = json{BOOST_PP_SEQ_FOR_EACH(DEFINE_SERIALIZATION_ELEMENT, _, BOOST_PP_CAT(CREATE_MY_MACRO_PLACEHOLDER_FILLER_0 TYPES_AND_NAMES,_END))}; \
} \
void from_json(const json& j, NAME& o) { \
    BOOST_PP_SEQ_FOR_EACH(DEFINE_DESERIALIZATION_ELEMENT, _, BOOST_PP_CAT(CREATE_MY_MACRO_PLACEHOLDER_FILLER_0 TYPES_AND_NAMES,_END)) \
} \
bool operator ==(const NAME& lhs, const NAME& rhs) { \
    return BOOST_PP_SEQ_FOR_EACH(DEFINE_EQUAL_OPERATOR_ELEM, _, BOOST_PP_CAT(CREATE_MY_MACRO_PLACEHOLDER_FILLER_0 TYPES_AND_NAMES,_END)) true; \
}

DEFINE_MODEL(Vin, (string, transaction_id, "txid")(int, vout, "vout"))