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| -rw-r--r-- | docs/miscellaneous.rst | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/docs/miscellaneous.rst b/docs/miscellaneous.rst index ac41ebca..4e61b283 100644 --- a/docs/miscellaneous.rst +++ b/docs/miscellaneous.rst @@ -152,6 +152,7 @@ Unfortunately, there are some subtleties the compiler does not yet warn you abou on the "gas stipend" (2300 gas) being available to it at that time. This stipend is not enough to access storage in any way. To be sure that your contract can receive Ether in that way, check the gas requirements of the fallback function. - If you want to send ether using ``address.send``, there are certain details to be aware of: + 1. If the recipient is a contract, it causes its fallback function to be executed which can in turn call back into the sending contract 2. Sending Ether can fail due to the call depth going above 1024. Since the caller is in total control of the call depth, they can force the transfer to fail, so make sure to always check the return value of ``send``. Better yet, @@ -160,6 +161,7 @@ Unfortunately, there are some subtleties the compiler does not yet warn you abou because the operation is just too expensive). If the return value of ``send`` is checked, this might provide a means for the recipient to block progress in the sending contract. Again, the best practise here is to use a "withdraw" pattern instead of a "send" pattern. + - Loops that do not have a fixed number of iterations, e.g. loops that depends on storage values, have to be used carefully: Due to the block gas limit, transactions can only consume a certain amount of gas. Either explicitly or just due to normal operation, the number of iterations in a loop can grow beyond the block gas limit, which can cause the complete |