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哈哈这个好像我知道

https://github.com/Dappub/DAPPDevNotes/blob/master/DAPP%E5%BC%80%E5%8F%91%E7%AC%94%E8%AE%B0-EOS-20180705.md:
erase了bet_itr之后，bet_itr就不能++了

请问下如何在合约中获取其他代币余额

获取的是非EOS代币余额可以做到吗？在另一个合约中获取自己部署的另一个合约的代币

请问账户余额是如何build的？

@thbourlove
https://github.com/Dappub/DAPPDevNotes/blob/master/DAPP%E5%BC%80%E5%8F%91%E7%AC%94%E8%AE%B0-EOS-20180701.md
我按照您的上面步骤来获取某个账户的余额，
本地EOS环境已经OK，EOS的example也正常通过eoscpp编译生产wast文件。
现在是想通过cpp来获取余额。如下是我简单的代码：

 #include <eosio.token/eosio.token.hpp>
 #include <eosiolib/eosio.hpp>
 auto eos_token = eosio::token(N(eosio.token));
 auto balance = eos_token.get_balance('eos.io', symbol_type(S(4, EOS)).name());
 print("eos balance:",balance.amount);

然后连接库文件：

ln -s /your eos path/contracts/eosio.token /usr/local/include/

然后编译：

eosiocpp -o account.wast accountbalance.cpp

然后报错：

accountbalance.cpp:4:38: warning: multi-character character constant [-Wmultichar]
auto balance = eos_token.get_balance('eos.io', symbol_type(S(4, EOS)).name());
                                     ^
accountbalance.cpp:4:38: warning: character constant too long for its type
accountbalance.cpp:4:48: error: use of undeclared identifier 'symbol_type'
auto balance = eos_token.get_balance('eos.io', symbol_type(S(4, EOS)).name());
                                               ^
accountbalance.cpp:5:1: error: C++ requires a type specifier for all declarations
print("eos balance:",balance.amount);
^
2 warnings and 2 errors generated.

请问是哪里的问题呢？
对EOS的编译不是很理解，请帮忙纠正下错误，谢谢

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