Players.cpp

//@abi action
void add(const account_name account, string& username) {
    /**
     * We require that only the owner of an account can use this action
     * or somebody with the account authorization
    */
    require_auth(account);

    /**
     * We access the "player" table as creating an object of type "playerIndex"
     * As parameters we pass code & scope - _self from the parent contract
    */
    playerIndex players(_self, _self);

    /**
     * We must verify that the account doesn't exist yet
     * If the account is not found the iterator variable should be players.end()
    */
    auto iterator = players.find(account);
    eosio_assert(iterator == players.end(), "Address for account already exists");

    /**
     * We add the new player in the table
     * The first argument is the payer of the storage which will store the data
    */
    players.emplace(account, [&](auto& player) {
        player.account_name = account;
        player.username = username;
        player.level = 1;
        player.health_points = 1000;
        player.energy_points = 1000;
    });
}