Eos: a simple question~Why are the method return values all void?

[zxf969175364]

struct bal_detail {
      uint64_t id;
      account_name user_account;
      account_name com_account;
      uint128_t balance;
      uint128_t frozen_balance;
      bool is_fronzen;

      auto primary_key()const { return id; }
      account_name get_user_name()const { return user_account; }
      EOSLIB_SERIALIZE( bal_detail, (id)(user_account)(com_account)(balance)(frozen_balance)(is_fronzen) )
};

    typedef eosio::multi_index<N(bal_detail), bal_detail, indexed_by<N(by_user_name), const_mem_fun<bal_detail, account_name, &bal_detail::get_user_name> > > balance_detail_index;

public:
        uint_128_t get_balance( const account_name account )
        {
             ......
             return balance;
        }

I tried to define a method with a return value of uint128_t in the public of the class but failed. If there is no way to define a method with a return value, how can I query the custom structure data?

[xJonathanLEI]

You just can't. Return values are not allowed in contract actions.

If you need to query data on other contracts, use the multi_index or singleton construct instead, with the code parameter set to the target contract instead of _self. Then, query the table like you would with your own tables.

[zxf969175364]

@xJonathanLEI thanks
In this case, can the scope and code of multi_index be set to owner? It is the _self of the deployment contract because I don't seem to have different code requirements.

[taokayan]

This is the current design. You can put the resulting information into the multi_index table if you really need it.