test::somefunction1(uint8_t numa, uint8_t numb, uint64_t rndn){
    /*
        some calculation with numa and numb
    */

    std::string data = ""+std::to_string(numa)+std::to_string(numb)+std::to_string(rndn);
    checksum256 hash;
    sha256((char*)&data, data.size(), &hash);

    auto itr= tb_test.find(some_id);
    tb_test.modify(itr, _self, [&](auto& f) {
        f.hashvalue1 = hash;
        f.data1s = data;
    });
}

test::somefunction2(uint8_t numa, uint8_t numb, uint64_t rndn){
    /*
        some calculation with numa and numb
    */

    std::string data = ""+std::to_string(numa)+std::to_string(numb)+std::to_string(rndn);
    checksum256 hash;
    sha256((char*)&data, data.size(), &hash);

    auto itr= tb_test.find(some_id);
    tb_test.modify(itr, _self, [&](auto& f) {
        f.hashvalue2 = hash;
        f.data2s = data;
    });
}

std::string toHash;
checksum256 calc_hash;        // fc::sha256
sha256(const_cast<char*>(toHash.c_str()), toHash.size() * sizeof(char), &calc_hash);