22 lines
629 B
Solidity
22 lines
629 B
Solidity
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pragma solidity ^0.4.24;
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contract IsContract {
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/*
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* NOTE: this should NEVER be used for authentication
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* (see pitfalls: https://github.com/fergarrui/ethereum-security/tree/master/contracts/extcodesize).
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*
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* This is only intended to be used as a sanity check that an address is actually a contract,
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* RATHER THAN an address not being a contract.
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*/
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function isContract(address _target) internal view returns (bool) {
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if (_target == address(0)) {
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return false;
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}
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uint256 size;
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assembly { size := extcodesize(_target) }
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return size > 0;
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}
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}
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