// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.5.0-rc.0) (token/ERC721/extensions/draft-ERC721Votes.sol) pragma solidity ^0.8.0; import "../ERC721Upgradeable.sol"; import "../../../governance/utils/VotesUpgradeable.sol"; import "../../../proxy/utils/Initializable.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 ERC721VotesUpgradeable is Initializable, ERC721Upgradeable, VotesUpgradeable { function __ERC721Votes_init() internal onlyInitializing { } function __ERC721Votes_init_unchained() internal onlyInitializing { } /** * @dev Adjusts votes when tokens are transferred. * * Emits a {Votes-DelegateVotesChanged} event. */ function _afterTokenTransfer( address from, address to, uint256 tokenId ) internal virtual override { _transferVotingUnits(from, to, 1); super._afterTokenTransfer(from, to, tokenId); } /** * @dev Returns the balance of `account`. */ function _getVotingUnits(address account) internal virtual override returns (uint256) { return balanceOf(account); } /** * This empty reserved space is put in place to allow future versions to add new * variables without shifting down storage in the inheritance chain. * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps */ uint256[50] private __gap; }