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| author | chriseth <chris@ethereum.org> | 2017-05-02 20:57:19 +0800 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2017-05-02 20:57:19 +0800 |
| commit | d8b76e1ecaf19e921e6a757a094e3ce3c2b02bbd (patch) | |
| tree | 0f6359c31c0b6a61ff648a08bb0a493fe3ceddf3 /docs | |
| parent | 2891b98882160c15a68b5166e3493ec8e7b21f7f (diff) | |
| parent | fc3f40febe3ed7686682e2e9ef4f615b206400b4 (diff) | |
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Merge pull request #2172 from ethereum/docs-sar
Document how Solidity's SAR is different
Diffstat (limited to 'docs')
| -rw-r--r-- | docs/types.rst | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/docs/types.rst b/docs/types.rst index 60235ad2..c868adc6 100644 --- a/docs/types.rst +++ b/docs/types.rst @@ -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 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 .. _address: |