64 lines
1.5 KiB
Solidity
64 lines
1.5 KiB
Solidity
// contracts/State.sol
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// SPDX-License-Identifier: Apache 2
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pragma solidity ^0.8.0;
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import "@openzeppelin/contracts/utils/Counters.sol";
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contract TokenStorage {
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struct State {
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string name;
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string symbol;
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uint64 metaLastUpdatedSequence;
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uint256 totalSupply;
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uint8 decimals;
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mapping(address => uint256) balances;
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mapping(address => mapping(address => uint256)) allowances;
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address owner;
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bool initialized;
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uint16 chainId;
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bytes32 nativeContract;
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// EIP712
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// Cache the domain separator and salt, but also store the chain id that
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// it corresponds to, in order to invalidate the cached domain separator
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// if the chain id changes.
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bytes32 cachedDomainSeparator;
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uint256 cachedChainId;
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address cachedThis;
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bytes32 cachedSalt;
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bytes32 cachedHashedName;
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// ERC20Permit draft
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mapping(address => Counters.Counter) nonces;
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}
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}
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contract TokenState {
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using Counters for Counters.Counter;
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TokenStorage.State _state;
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/**
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* @dev See {IERC20Permit-nonces}.
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*/
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function nonces(address owner_) public view returns (uint256) {
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return _state.nonces[owner_].current();
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}
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/**
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* @dev "Consume a nonce": return the current value and increment.
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*/
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function _useNonce(address owner_) internal returns (uint256 current) {
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Counters.Counter storage nonce = _state.nonces[owner_];
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current = nonce.current();
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nonce.increment();
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}
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} |