5dfe7215a9
* Initial migration to Solidity 0.6.x - v3.0 first steps (#2063) * Initial migration, missing GSN, 721, 777 and Crowdsales. * Add _beforeTokenOperation and _afterTokenOperation. * Add documentation for hooks. * Add hooks doc * Add missing drafts * Add back ERC721 with hooks * Bring back ERC777 * Notes on hooks * Bring back GSN * Make functions virtual * Make GSN overrides explicit * Fix ERC20Pausable tests * Remove virtual from some view functions * Update linter * Delete examples * Remove unnecessary virtual * Remove roles from Pausable * Remove roles * Remove users of roles * Adapt ERC20 tests * Fix ERC721 tests * Add all ERC721 hooks * Add ERC777 hooks * Fix remaining tests * Bump compiler version * Move 721BurnableMock into mocks directory * Remove _before hooks * Fix tests * Upgrade linter * Put modifiers last * Remove _beforeTokenApproval and _beforeOperatorApproval hooks
28 lines
764 B
Solidity
28 lines
764 B
Solidity
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 if you want to stop trades until the end of a crowdsale, or have
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* an emergency switch for freezing all token transfers in the event of a large
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* 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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