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Clarify function call options example.

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chriseth 2021-08-31 14:32:32 +02:00
parent 13691dfbaa
commit 9033660b22
1 changed files with 4 additions and 2 deletions
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docs/control-structures.rst
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@ -105,8 +105,10 @@ otherwise, the ``value`` option would not be available.
.. warning:: .. warning::
Be careful that ``feed.info{value: 10, gas: 800}`` only locally sets the Be careful that ``feed.info{value: 10, gas: 800}`` only locally sets the
``value`` and amount of ``gas`` sent with the function call, and the ``value`` and amount of ``gas`` sent with the function call, and the
parentheses at the end perform the actual call. So in this case, the parentheses at the end perform the actual call. So
function is not called and the ``value`` and ``gas`` settings are lost. ``feed.info{value: 10, gas: 800}`` does not call the function and
the ``value`` and ``gas`` settings are lost, only
``feed.info{value: 10, gas: 800}()`` performs the function call.
Due to the fact that the EVM considers a call to a non-existing contract to Due to the fact that the EVM considers a call to a non-existing contract to
always succeed, Solidity uses the ``extcodesize`` opcode to check that always succeed, Solidity uses the ``extcodesize`` opcode to check that