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47 lines
2.0 KiB
Solidity
47 lines
2.0 KiB
Solidity
// SPDX-License-Identifier: MIT
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// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC20/extensions/ERC20VotesComp.sol)
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pragma solidity ^0.8.0;
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import "./ERC20Votes.sol";
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/**
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* @dev Extension of ERC20 to support Compound's voting and delegation. This version exactly matches Compound's
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* interface, with the drawback of only supporting supply up to (2^96^ - 1).
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*
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* NOTE: You should use this contract if you need exact compatibility with COMP (for example in order to use your token
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* with Governor Alpha or Bravo) and if you are sure the supply cap of 2^96^ is enough for you. Otherwise, use the
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* {ERC20Votes} variant of this module.
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*
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* This extension keeps a history (checkpoints) of each account's vote power. Vote power can be delegated either
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* by calling the {delegate} function directly, or by providing a signature to be used with {delegateBySig}. Voting
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* power can be queried through the public accessors {getCurrentVotes} and {getPriorVotes}.
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*
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* By default, token balance does not account for voting power. This makes transfers cheaper. The downside is that it
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* requires users to delegate to themselves in order to activate checkpoints and have their voting power tracked.
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*
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* _Available since v4.2._
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*/
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abstract contract ERC20VotesComp is ERC20Votes {
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/**
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* @dev Comp version of the {getVotes} accessor, with `uint96` return type.
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*/
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function getCurrentVotes(address account) external view virtual returns (uint96) {
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return SafeCast.toUint96(getVotes(account));
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}
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/**
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* @dev Comp version of the {getPastVotes} accessor, with `uint96` return type.
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*/
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function getPriorVotes(address account, uint256 blockNumber) external view virtual returns (uint96) {
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return SafeCast.toUint96(getPastVotes(account, blockNumber));
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}
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/**
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* @dev Maximum token supply. Reduced to `type(uint96).max` (2^96^ - 1) to fit COMP interface.
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*/
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function _maxSupply() internal view virtual override returns (uint224) {
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return type(uint96).max;
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}
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}
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