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Add warning that low-level call/callcode/delegatecall don't check for existence

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Alex Beregszaszi 2017-08-01 12:54:59 +01:00
parent f63bb0a442
commit d1b13c0624
1 changed files with 3 additions and 0 deletions
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docs/control-structures.rst
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@ -393,6 +393,9 @@ When exceptions happen in a sub-call, they "bubble up" (i.e. exceptions are reth
and the low-level functions ``call``, ``delegatecall`` and ``callcode`` -- those return ``false`` in case
of an exception instead of "bubbling up".
.. warning::
The low-level ``call``, ``delegatecall`` and ``callcode`` will return success if the calling account is non-existent, as part of the design of EVM. Existence must be checked prior to calling if desired.
Catching exceptions is not yet possible.
In the following example, you can see how ``require`` can be used to easily check conditions on inputs