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Write about what fallback functions cannot do

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Denton Liu 2016-08-25 15:43:04 -04:00
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docs/contracts.rst
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@ -434,6 +434,14 @@ Ether (without data). In such a context, there is very little gas available to
the function call (to be precise, 2300 gas), so it is important to make fallback functions as cheap as the function call (to be precise, 2300 gas), so it is important to make fallback functions as cheap as
possible. possible.
In particular, the following operations will consume more gas than the stipend provided to a fallback function:
- Writing to storage
- Creating a contract
- Calling an external function which consumes a large amount of gas
Please ensure you test your fallback function thoroughly to ensure the execution cost is less than 2300 gas before deploying a contract.
:: ::
contract Test { contract Test {