54 lines
1.9 KiB
Solidity
54 lines
1.9 KiB
Solidity
// SPDX-License-Identifier: MIT
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// OpenZeppelin Contracts (last updated v4.5.0-rc.0) (token/ERC721/extensions/draft-ERC721Votes.sol)
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pragma solidity ^0.8.0;
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import "../ERC721Upgradeable.sol";
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import "../../../governance/utils/VotesUpgradeable.sol";
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import "../../../proxy/utils/Initializable.sol";
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/**
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* @dev Extension of ERC721 to support voting and delegation as implemented by {Votes}, where each individual NFT counts
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* as 1 vote unit.
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*
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* Tokens do not count as votes until they are delegated, because votes must be tracked which incurs an additional cost
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* on every transfer. Token holders can either delegate to a trusted representative who will decide how to make use of
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* the votes in governance decisions, or they can delegate to themselves to be their own representative.
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*
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* _Available since v4.5._
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*/
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abstract contract ERC721VotesUpgradeable is Initializable, ERC721Upgradeable, VotesUpgradeable {
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function __ERC721Votes_init() internal onlyInitializing {
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}
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function __ERC721Votes_init_unchained() internal onlyInitializing {
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}
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/**
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* @dev Adjusts votes when tokens are transferred.
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*
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* Emits a {Votes-DelegateVotesChanged} event.
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*/
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function _afterTokenTransfer(
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address from,
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address to,
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uint256 tokenId
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) internal virtual override {
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_transferVotingUnits(from, to, 1);
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super._afterTokenTransfer(from, to, tokenId);
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}
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/**
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* @dev Returns the balance of `account`.
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*/
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function _getVotingUnits(address account) internal virtual override returns (uint256) {
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return balanceOf(account);
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}
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/**
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* This empty reserved space is put in place to allow future versions to add new
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* variables without shifting down storage in the inheritance chain.
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* See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
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*/
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uint256[50] private __gap;
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}
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