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Warning in approve method documentation.

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jakub-wojciechowski
2017-09-15 12:28:29 +02:00
committed by Francisco Giordano
parent 98f672b534
commit adfd8fb6a9
1 changed files with 5 additions and 0 deletions
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5
contracts/token/StandardToken.sol
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@ -40,6 +40,11 @@ contract StandardToken is ERC20, BasicToken {
/** /**
* @dev Approve the passed address to spend the specified amount of tokens on behalf of msg.sender. * @dev Approve the passed address to spend the specified amount of tokens on behalf of msg.sender.
*
* Beware that changing an allowance with this method brings the risk that someone may use both the old
* and the new allowance by unfortunate transaction ordering. One possible solution to mitigate this
* race condition is to first reduce the spender's allowance to 0 and set the desired value afterwards:
* https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
* @param _spender The address which will spend the funds. * @param _spender The address which will spend the funds.
* @param _value The amount of tokens to be spent. * @param _value The amount of tokens to be spent.
*/ */