48 lines
1.5 KiB
Solidity
48 lines
1.5 KiB
Solidity
// SPDX-License-Identifier: MIT
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// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/ERC20Pausable.sol)
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pragma solidity ^0.8.0;
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import "../ERC20Upgradeable.sol";
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import "../../../security/PausableUpgradeable.sol";
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import "../../../proxy/utils/Initializable.sol";
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/**
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* @dev ERC20 token with pausable token transfers, minting and burning.
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*
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* Useful for scenarios such as preventing trades until the end of an evaluation
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* period, or having an emergency switch for freezing all token transfers in the
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* event of a large bug.
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*/
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abstract contract ERC20PausableUpgradeable is Initializable, ERC20Upgradeable, PausableUpgradeable {
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function __ERC20Pausable_init() internal onlyInitializing {
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__Pausable_init_unchained();
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}
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function __ERC20Pausable_init_unchained() internal onlyInitializing {
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}
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/**
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* @dev See {ERC20-_beforeTokenTransfer}.
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*
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* Requirements:
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*
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* - the contract must not be paused.
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*/
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function _beforeTokenTransfer(
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address from,
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address to,
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uint256 amount
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) internal virtual override {
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super._beforeTokenTransfer(from, to, amount);
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require(!paused(), "ERC20Pausable: token transfer while paused");
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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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