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27 lines
788 B
27 lines
788 B
pragma solidity ^0.6.0;
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import "./ERC20.sol";
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import "../../lifecycle/Pausable.sol";
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/**
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* @title Pausable token
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* @dev ERC20 with pausable transfers and allowances.
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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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contract ERC20Pausable is ERC20, Pausable {
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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(address from, address to, uint256 amount) 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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