How is safemath's "mul" preventing overflow?

• openzeppelin-contracts

  233 24,109 9.5 JavaScript

  OpenZeppelin Contracts is a library for secure smart contract development.

  

function mul(uint256 a, uint256 b) internal pure returns (uint256) { // Gas optimization: this is cheaper than requiring 'a' not being zero, but the // benefit is lost if 'b' is also tested. // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522 if (a == 0) { return 0; } uint256 c = a * b; require(c / a == b, 'SafeMath: multiplication overflow'); return c; }

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