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ERC721Votes.sol
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ERC721Votes.sol
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// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (token/ERC721/extensions/ERC721Votes.sol)
pragma solidity ^0.8.0;
import "../ERC721.sol";
import "../../../governance/utils/Votes.sol";
/**
* @dev Extension of ERC721 to support voting and delegation as implemented by {Votes}, where each individual NFT counts
* as 1 vote unit.
*
* Tokens do not count as votes until they are delegated, because votes must be tracked which incurs an additional cost
* on every transfer. Token holders can either delegate to a trusted representative who will decide how to make use of
* the votes in governance decisions, or they can delegate to themselves to be their own representative.
*
* _Available since v4.5._
*/
abstract contract ERC721Votes is ERC721, Votes {
/**
* @dev See {ERC721-_afterTokenTransfer}. Adjusts votes when tokens are transferred.
*
* Emits a {IVotes-DelegateVotesChanged} event.
*/
function _afterTokenTransfer(
address from,
address to,
uint256 firstTokenId,
uint256 batchSize
) internal virtual override {
_transferVotingUnits(from, to, batchSize);
super._afterTokenTransfer(from, to, firstTokenId, batchSize);
}
/**
* @dev Returns the balance of `account`.
*/
function _getVotingUnits(address account) internal view virtual override returns (uint256) {
return balanceOf(account);
}
}