04fc35707d
* Update contract pragmas to solidity 0.7 * Remove internal declaration on constructors * Reference SafeMath explicitely * Remove public constructor declaration from abstract contracts * Remove public constructor declaration from non-abstract contracts
29 lines
827 B
Solidity
29 lines
827 B
Solidity
// SPDX-License-Identifier: MIT
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pragma solidity ^0.7.0;
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import "./ERC721.sol";
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import "../../utils/Pausable.sol";
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/**
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* @dev ERC721 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 ERC721Pausable is ERC721, Pausable {
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/**
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* @dev See {ERC721-_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 tokenId) internal virtual override {
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super._beforeTokenTransfer(from, to, tokenId);
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require(!paused(), "ERC721Pausable: token transfer while paused");
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}
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}
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