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optimize lock w/r/t the gas refund counter

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This commit is contained in:
Noah Zinsmeister
2020-02-03 16:11:19 -05:00
parent a1e31c29a6
commit 05dfa2f9ba
1 changed files with 6 additions and 4 deletions
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10
contracts/UniswapV2Exchange.sol
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@ -25,12 +25,14 @@ contract UniswapV2Exchange is IUniswapV2Exchange, UniswapV2ERC20 {
uint public price1CumulativeLast;
uint public kLast; // reserve0 * reserve1, as of immediately after the most recent liquidity event
bool private unlocked = true;
uint private constant UNLOCKED = 1; // toggle between 1 and 2 (not 0) to save on the gas refund counter
uint private constant LOCKED = 2; // toggle between 1 and 2 (not 0) to save on the gas refund counter
uint private lockState = UNLOCKED;
modifier lock() {
require(unlocked, 'UniswapV2: LOCKED');
unlocked = false;
require(lockState == UNLOCKED, 'UniswapV2: LOCKED');
lockState = LOCKED;
_;
unlocked = true;
lockState = UNLOCKED;
}
function getReserves() public view returns (uint112 _reserve0, uint112 _reserve1, uint32 _blockTimestampLast) {