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Diffstat (limited to 'docs/control-structures.rst')
| -rw-r--r-- | docs/control-structures.rst | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/docs/control-structures.rst b/docs/control-structures.rst index 2f867cb0..6d615caf 100644 --- a/docs/control-structures.rst +++ b/docs/control-structures.rst @@ -69,6 +69,18 @@ this does not execute a constructor. We could also have used ``function setFeed( only (locally) sets the value and amount of gas sent with the function call and only the parentheses at the end perform the actual call. +.. warning:: + Any interaction with another contract imposes a certain danger, especially + if the source code of the contract is not known in advance. The current + contract hands over control to the called contract and that might do + just about anything. Be prepared that it calls into other contracts of + your system and perhaps even back into the calling contract before your + call returns. This means + that the called contract can change state variables of the calling contract + via its functions. Write your functions in a way that e.g. calls to + external functions happen after any changes to state variables in your contract, + so your contract is not vulnerable to a recursive call exploit. + Named Calls and Anonymous Function Parameters --------------------------------------------- |