c9630526e2
* Move Pausable into utils * Move Strings into utils * Move Counters into utils * Move SignedSafeMath into math * Remove ERC1046 * Make ERC20Snapshot.snapshot internal * Move ERC20Snapshot into ERC20 * Add drafts deprecation notice * Remove drafts directory * Add changelog entry * Apply suggestions from code review Co-Authored-By: Francisco Giordano <frangio.1@gmail.com> Co-authored-by: Francisco Giordano <frangio.1@gmail.com>
28 lines
784 B
Solidity
28 lines
784 B
Solidity
pragma solidity ^0.6.0;
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import "./ERC20.sol";
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import "../../utils/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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