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SafeMath library example
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| pragma solidity >= 0.4.25 < 0.6.0; | |
| library SafeMath { | |
| function add(uint256 a, uint256 b) public pure returns (uint256){ | |
| uint256 c = a + b; | |
| require(c >= a, "SafeMath: addition overflow"); | |
| return c; | |
| } | |
| } |
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