如何从外部资源将库连接到智能合约? [英] How connect library to smart contract from external resources?

问题描述

pragma solidity ^0.4.15;

import './ERC20.sol';
import './SafeMath.sol';

如何从外部资源(非本地)连接 SafeMath.sol ?

How connect SafeMath.sol from external(non-local) resourses?

推荐答案

这可能是您的意思:

pragma solidity ^0.4.0;

import "github.com/OpenZeppelin/zeppelin-solidity/contracts/math/SafeMath.sol";

contract MathExtended {
    using SafeMath for uint;
    function exec(uint a, uint b) returns (uint){
        return a.add(b);
    }
}

Solidity支持直接从Github导入，只记得在引用必须直接是user/project/file-path/file.sol时不要包含提交或分支.

Solidity supports importing from Github directly, just remember not to include commits or branches when reference it must be the user/project/file-path/file.sol directly.

请参见 http://solidity.readthedocs.io/zh/develop/layout-of-source-files.html

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