WAX RNG sample usage

// This requires CDT 1.6.x or later
#include <eosio/eosio.hpp>

#include <string>
#include <tuple>

using namespace eosio;

CONTRACT sample: public contract {
public:
    WAX_CONTRACT_NAME(name receiver, name code, datastream<const char*> ds)
        : contract(receiver, code, ds) {
    }

    ACTION printrand(uint64_t assoc_id, uint64_t signing_value) {
        action(
            { get_self(), "active"_n },
            "orng.wax"_n,
            "requestrand"_n,
            std::tuple{ assoc_id, signing_value, get_self() })
            .send();
    }

    /// Called automatically by 'orng.wax' smart contract when the RNG Oracle
    /// has generated the random value. wax.orng, before calling this action,
    /// verifies that the generated random value was signed with the
    /// provided "signing_value"
    ACTION receiverand(uint64_t assoc_id, const std::string& random_value) {
        print_f("Assoc ID = %, Random value = %\n", assoc_id, random_value.c_str());
    }

}; // CONTRACT sample

EOSIO_DISPATCH(WAX_CONTRACT_NAME, (printrand)(receiverand))