[Development] What's the status of a moved-from object?

Giuseppe D'Angelo giuseppe.dangelo at kdab.com
Mon May 20 21:27:42 CEST 2019

Il 20/05/19 20:36, André Pönitz ha scritto:
>> I actually think we should consider getting rid of shared_null and
>> instead have d == nullptr as the null/default constructed state of the
>> object. Yes, that means we need to check for d == nullptr in member
>> functions, but I don’t think the overhead is a problem, as d will have
>> to be loaded into a register in any case.
> In case someone submits such change I'd appreciate some performance
> checking.

Not related to this email, but: please, we're switching from _what_ we 
want to _how_ we get it.

I understand the two are very tied (given the implicit sharing), but it 
seems to me that we are not agreeing on what a move constructor should 
do in the first place?

Giuseppe D'Angelo | giuseppe.dangelo at kdab.com | 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

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