Re: BUG #16790: Integer overflow not detected with <<

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От Tom Lane
Тема Re: BUG #16790: Integer overflow not detected with <<
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Msg-id 710063.1608737396@sss.pgh.pa.us
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Ответ на BUG #16790: Integer overflow not detected with <<  (PG Bug reporting form <noreply@postgresql.org>)
Ответы Re: BUG #16790: Integer overflow not detected with <<  (Alexander Lakhin <exclusion@gmail.com>)
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PG Bug reporting form <noreply@postgresql.org> writes:
> It seems that the bitwise shift left operator ignores overflow:
> Is this an expected behavior (a kind of UB)? It's not like an arithmetic
> shift. (The semantic of '1::int4<<-1' is questionable too.)

It's defined to do whatever the C << operator does.  That will certainly
not involve throwing an error.

            regards, tom lane

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