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Mention dangers of polymorphism

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Denton Liu 2016-07-07 16:34:05 -04:00
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docs/control-structures.rst
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@ -73,7 +73,10 @@ parentheses at the end perform the actual call.
Any interaction with another contract imposes a potential 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 may potentially
do just about anything. Be prepared in case it calls into other contracts of
do just about anything. Even if the called contract inherits from a known parent contract,
the inheriting contract is only required to have a correct interface. The
implementation of the contract, however, can be completely arbitrary and thus,
pose a danger. In addition, be prepared in case it calls into other contracts of
your system or even back into the calling contract before the first
call returns. This means
that the called contract can change state variables of the calling contract