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Re: Relational operators with using pointers.

From: Giuseppe D'Angelo <giuseppe.dangelo_at_[hidden]>
Date: Wed, 30 Nov 2022 20:36:41 +0100

Il 30/11/22 20:30, Vladimir Grigoriev via Std-Discussion ha scritto:
> So is the behavior is undefined or unspecified when there are compared
> two pointers to different objects that are not elements of the
> same array. as for example
> &x < &y

This is


"neither pointer is required to compare greater than the other".

Which maybe means it's not UB to merely call the operator, but the
result is useless; and if you feed such an operator into something with
preconditions (like a sorting algorithm, that needs a strict weak order)
then you trigger library UB.


Giuseppe D'Angelo | giuseppe.dangelo_at_[hidden] | Senior Software Engineer
KDAB (France) S.A.S., a KDAB Group company
Tel. France +33 (0)4 90 84 08 53, http://www.kdab.com
KDAB - The Qt, C++ and OpenGL Experts

Received on 2022-11-30 19:36:44