Issue 2087: Left shift of negative value by zero bits

Title: Left shift of negative value by zero bits
Status: nad
Section: 7.6.7 [expr.shift]
Submitter: Mattheus Izvekov

Created on 2015-02-16.00:00:00 last changed 48 months ago

Messages

msg6296 (view)

Date: 2019-02-15.00:00:00

Rationale (February, 2019):

This issue is resolved by the adoption of paper P1236.

msg5781 (view)

Date: 2016-02-15.00:00:00

Notes from the February, 2016 meeting:

CWG felt that a reasonable approach might be to define <<N as equivalent to multiplying by 2^N in all cases; see also the resolution of issue 1457. The resolution of this question should also be coordinated with SG6 and SG12, as well as with WG14.

msg5544 (view)

Date: 2015-02-16.00:00:00

A shift of zero bits should result in the left operand regardless of its sign. However, the current wording of 7.6.7 [expr.shift] paragraph 2 makes it undefined behavior.

History
Date	User	Action	Args
2020-12-15 00:00:00	admin	set	messages: + msg6296
2020-12-15 00:00:00	admin	set	status: open -> nad
2017-02-06 00:00:00	admin	set	messages: + msg5781
2015-02-16 00:00:00	admin	create