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improve mum performance and reduce gas cost

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Chen Yi-Cyuan
2017-10-30 09:58:52 +08:00
parent 39d6c92069
commit 5ad07e1892
1 changed files with 4 additions and 1 deletions
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5
contracts/math/SafeMath.sol
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@ -7,8 +7,11 @@ pragma solidity ^0.4.11;
*/ */
library SafeMath { library SafeMath {
function mul(uint256 a, uint256 b) internal constant returns (uint256) { function mul(uint256 a, uint256 b) internal constant returns (uint256) {
if (a == 0) {
return 0;
}
uint256 c = a * b; uint256 c = a * b;
assert(a == 0 || c / a == b); assert(c / a == b);
return c; return c;
} }