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I'm unable to compile a small test contract and am hoping for guidance. I have a class called Account, in the following 2 files:

// --- account.hpp 
#pragma once

#include <string>
#include <cmath>
#include <limits>
#include <numeric>
#include <eosio/eosio.hpp>
#include <eosio/system.hpp>
#include <eosio/asset.hpp>
#include <eosio/singleton.hpp>
#include <eosio/transaction.hpp>

namespace myapp {
    using namespace eosio;

    class Account {
        private:

        struct [[eosio::table]] _balances {
            asset value;
            uint64_t primary_key() const {
                return value.symbol.code().raw();
            }   
        };  
        typedef multi_index<name("balances"), _balances> EOST;
        EOST t;

        public:

        class Balance {
            public:

            Balance(EOST t, symbol sym);
            int64_t sat = 0;
            double amt = 0;
        };  

        Account(name code, name acct);
        Balance bal(asset o); 
        Balance bal(symbol sym);
    };  
}

and

// --- account.cpp
#include "account.hpp"

namespace myapp {
    using namespace eosio;
    Account::Balance::Balance(EOST t, symbol sym) {
        auto o = t.find(sym.code().raw());
        if (o != t.end()) {
            sat = o->value.amount;
            amt = o->value.amount / pow(10, o->value.symbol.precision());
        }
    }
    Account::Account(name code, name acct)
        : t(code, acct.value) {
    }
    Account::Balance Account::bal(asset o) {
        return bal(o.symbol);
    }   
    Account::Balance Account::bal(symbol sym) {
        return Balance(this->t, sym);
    }       
}

which I then use from my contract quite simply like this:

// --- token.cpp
#pragma once

#include <string>
#include <cmath>
#include <limits>
#include <numeric>
#include <eosio/eosio.hpp>
#include <eosio/system.hpp>
#include <eosio/asset.hpp>
#include <eosio/singleton.hpp>
#include <eosio/transaction.hpp>

#include "account.cpp"

namespace eosiosystem {
    class system_contract;
}

namespace eosio {
    class [[eosio::contract("token")]] token : public contract {
    public:
        [[eosio::action]] void ping() {
            myapp::Account acct(_self, name("cust1"));
            myapp::Account::Balance b = acct.bal(symbol("USD", 8));
            print("\nbalance = ", b.sat, ", ", b.amt);
        }   
    };  
}

however, the code won't compile, citing the aforementioned error:

In file included from /Users/ekkis/dev/eos/account/token.cpp:3: In file included from /usr/local/Cellar/eosio.cdt/1.6.1/opt/eosio.cdt/bin/../include/libcxx/string:470: In file included from /usr/local/Cellar/eosio.cdt/1.6.1/opt/eosio.cdt/bin/../include/libcxx/string_view:169: In file included from /usr/local/Cellar/eosio.cdt/1.6.1/opt/eosio.cdt/bin/../include/libcxx/__string:56: In file included from /usr/local/Cellar/eosio.cdt/1.6.1/opt/eosio.cdt/bin/../include/libcxx/algorithm:643: /usr/local/Cellar/eosio.cdt/1.6.1/opt/eosio.cdt/bin/../include/libcxx/memory:1759:31: error: call to implicitly-deleted copy constructor of 'eosio::multi_index<4152997948076064768, myapp::Account::_balances>::item_ptr' ::new((void*)__p) _Up(_VSTD::forward<_Args>(__args)...); ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ /usr/local/Cellar/eosio.cdt/1.6.1/opt/eosio.cdt/bin/../include/libcxx/memory:1670:18: note: in instantiation of function template specialization 'std::__1::allocator::item_ptr>::construct::item_ptr, eosio::multi_index<4152997948076064768, myapp::Account::_balances>::item_ptr &>' requested here {__a.construct(__p, _VSTD::forward<_Args>(__args)...);} ^ /usr/local/Cellar/eosio.cdt/1.6.1/opt/eosio.cdt/bin/../include/libcxx/memory:1516:14: note: in instantiation of function template specialization 'std::__1::allocator_traits::item_ptr>

::__construct::item_ptr, eosio::multi_index<4152997948076064768, myapp::Account::_balances>::item_ptr &>' requested here {__construct(__has_construct(), ^ /usr/local/Cellar/eosio.cdt/1.6.1/opt/eosio.cdt/bin/../include/libcxx/memory:1600:17: note: in instantiation of function template specialization 'std::__1::allocator_traits::item_ptr> ::construct::item_ptr, eosio::multi_index<4152997948076064768, myapp::Account::_balances>::item_ptr &>' requested here construct(__a, _VSTD::__to_raw_pointer(__begin2), *__begin1); ^ /usr/local/Cellar/eosio.cdt/1.6.1/opt/eosio.cdt/bin/../include/libcxx/vector:1030:21: note: in instantiation of function template specialization 'std::__1::allocator_traits::item_ptr> ::__construct_range_forward::item_ptr *, eosio::multi_index<4152997948076064768, myapp::Account::_balances>::item_ptr *>' requested here __alloc_traits::__construct_range_forward(__a, __first, __last, this... ^ /usr/local/Cellar/eosio.cdt/1.6.1/opt/eosio.cdt/bin/../include/libcxx/vector:1213:9: note: in instantiation of function template specialization 'std::__1::vector::item_ptr, std::__1::allocator::item_ptr> ::__construct_at_end::item_ptr *>' requested here __construct_at_end(__x.__begin_, __x.__end_, __n); ^ /usr/local/Cellar/eosio.cdt/1.6.1/opt/eosio.cdt/bin/../include/eosiolib/contracts/eosio/multi_index.hpp:431:7: note: in instantiation of member function 'std::__1::vector::item_ptr, std::__1::allocator::item_ptr> >::vector' requested here class multi_index ^ /usr/local/Cellar/eosio.cdt/1.6.1/opt/eosio.cdt/bin/../include/eosiolib/contracts/eosio/multi_index.hpp:474:32: note: copy constructor of 'item_ptr' is implicitly deleted because field '_item' has a deleted copy constructor std::unique_ptr _item; ^ /usr/local/Cellar/eosio.cdt/1.6.1/opt/eosio.cdt/bin/../include/libcxx/memory:2388:3: note: copy constructor is implicitly deleted because 'unique_ptr::item, std::__1::default_delete::item> >' has a user-declared move constructor unique_ptr(unique_ptr&& __u) noexcept ^ Warning, empty ricardian clause file Warning, empty ricardian clause file Warning, action does not have a ricardian contract 1 error generated. Error while processing /Users/ekkis/dev/eos/account/token.cpp. abigen error

from which the error copy constructor of 'item_ptr' is implicitly deleted because field '_item' has a deleted copy constructor std::unique_ptr _item stands out. but I'm no brighter for it as to what the issue could be

help?

0

ah. the problem is that the EOS table must be passed by reference:

Account::Balance::Balance(EOST &t, symbol sym) {
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