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Merge pull request #4526 from ethereum/docs-address-truncation

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Clarify truncation with addresses
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Alex Beregszaszi 2018-08-03 14:11:07 +01:00 committed by GitHub
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@ -104,6 +104,14 @@ Operators:
* ``<=``, ``<``, ``==``, ``!=``, ``>=`` and ``>``
.. warning::
If you convert a type that uses a larger byte size to an ``address``, for example ``bytes32``, then the ``address`` is truncated.
To reduce conversion ambiguity version 0.4.24 and higher of the compiler force you make the truncation explicit in the conversion.
Take for example the address ``0x111122223333444455556666777788889999AAAABBBBCCCCDDDDEEEEFFFFCCCC``.
You can use ``address(uint160(bytes20(b)))``, which results in ``0x111122223333444455556666777788889999aAaa``,
or you can use ``address(uint160(uint256(b)))``, which results in ``0x777788889999AaAAbBbbCcccddDdeeeEfFFfCcCc``.
.. note::
Starting with version 0.5.0 contracts do not derive from the address type, but can still be explicitly converted to address.