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ERC20 extension for governance tokens (vote delegation and snapshots) (#2632)

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Co-authored-by: Francisco Giordano <frangio.1@gmail.com>
This commit is contained in:
Hadrien Croubois
2021-05-12 15:13:59 +02:00
committed by GitHub
parent 8669481309
commit 100ca0b8a2
8 changed files with 715 additions and 5 deletions
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15
contracts/utils/math/SafeCast.sol
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@ -18,6 +18,21 @@ pragma solidity ^0.8.0;
* all math on `uint256` and `int256` and then downcasting.
*/
library SafeCast {
/**
* @dev Returns the downcasted uint224 from uint256, reverting on
* overflow (when the input is greater than largest uint224).
*
* Counterpart to Solidity's `uint224` operator.
*
* Requirements:
*
* - input must fit into 224 bits
*/
function toUint224(uint256 value) internal pure returns (uint224) {
require(value < 2**224, "SafeCast: value doesn\'t fit in 224 bits");
return uint224(value);
}
/**
* @dev Returns the downcasted uint128 from uint256, reverting on
* overflow (when the input is greater than largest uint128).