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Add warning about SAR in docs

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Paweł Bylica 2017-04-28 14:00:59 +02:00 committed by Alex Beregszaszi
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commit fc3f40febe
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docs/types.rst
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@ -64,6 +64,12 @@ expression ``x << y`` is equivalent to ``x * 2**y`` and ``x >> y`` is
equivalent to ``x / 2**y``. This means that shifting negative numbers equivalent to ``x / 2**y``. This means that shifting negative numbers
sign extends. Shifting by a negative amount throws a runtime exception. sign extends. Shifting by a negative amount throws a runtime exception.
.. warning::
The results produced by shift right of negative values of signed integer types is different from those produced
by other programming languages. In Solidity, shift right maps to division so the shifted negative values
are going to be rounded towards zero (truncated). In other programming languages the shift right of negative values
works like division with rounding down (towards negative infinity).
.. index:: address, balance, send, call, callcode, delegatecall, transfer .. index:: address, balance, send, call, callcode, delegatecall, transfer
.. _address: .. _address: