fibonacci.cpp

#include <eoslib/eos.hpp>
#include <eoslib/db.hpp>

extern "C" {
    void init()  {
    }

    struct compute {
       uint64_t iterations;
    };

    struct PACKED(result) {
        result() {};
        result(eosio::name id, uint64_t value):id(id), value(value) {};
        eosio::name id;
        uint64_t value;
    };

    using Results = eosio::table<N(fibonacci), N(fibonacci), N(results), result, uint64_t>;

    uint64_t fibonacci(uint64_t iterations) {
        uint64_t first = 0;
        uint64_t second = 1;

        if (iterations == 0)
            return 0;

        eosio::print("1 ");
        for (uint64_t i=1; i < iterations; i++) {
            uint64_t res = first + second;
            first = second;
            second = res;
            eosio::print(res, " ");
        }
        return second;
    }

    /// The apply method implements the dispatch of events to this contract
    void apply( uint64_t code, uint64_t action ) {
        if (action == N(compute)) {
            auto message = eosio::current_message<compute>();
            eosio::print("Calling fibonacci\n");
            uint64_t num = fibonacci(message.iterations);

            result res(eosio::name(code), num);
            Results::store(res, res.id);
            eosio::print("Stored result in database\n");
        }
    }
} // extern "C"