cerc-io/solidity
10
0
Fork 0
mirror of https://github.com/ethereum/solidity synced 2023-10-03 13:03:40 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

Clarify truncation with addresses

Browse Source
This commit is contained in:
Chris Ward 2018-07-18 17:03:30 +02:00 committed by Alex Beregszaszi
parent da6cefd475
commit 22a2f5dd1d
1 changed files with 8 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
docs/types.rst
View File

@ -104,6 +104,14 @@ Operators:
* ``<=``, ``<``, ``==``, ``!=``, ``>=`` and ``>`` * ``<=``, ``<``, ``==``, ``!=``, ``>=`` 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:: .. note::
Starting with version 0.5.0 contracts do not derive from the address type, but can still be explicitly converted to address. Starting with version 0.5.0 contracts do not derive from the address type, but can still be explicitly converted to address.