[cfe-dev] Clang error message implicitly-deleted copy constructor

[Fletcher, John P]

Nico

That could be the problem.  I am using the std library which comes with gcc 4.4 (as patched for clang as per the web pages) as I am running Ubuntu 10.4.  Should I try a different version of libstdc++?

John

Dr John P. Fletcher Tel: (44) 121 204 3389 (direct line), FAX: (44) 121 204 3678
Chemical Engineering and Applied Chemistry (CEAC),
formerly Associate Dean - External Relations,
School of Engineering and Applied Science (EAS),
Aston University, Aston Triangle, BIRMINGHAM B4 7ET  U.K.               


-----Original Message-----
From: thakis at google.com [mailto:thakis at google.com] On Behalf Of Nico Weber
Sent: 27 March 2012 17:05
To: Fletcher, John P
Cc: cfe-dev at cs.uiuc.edu
Subject: Re: [cfe-dev] Clang error message implicitly-deleted copy constructor

Which standard library is your pair<> from? If a class has an explicit move assignment operator, this will implicitly mark the default copy constructor as deleted, and the class author has to provide an explicit copy constructor (likely with move semantics) if copying should work. Maybe your c++ standard library gets this wrong. (The one that ships with MSVC2010 does get this wrong for example.)

Nico

On Tue, Mar 27, 2012 at 8:57 AM, Fletcher, John P <j.p.fletcher at aston.ac.uk> wrote:
> Apologies that this not related to clang development, more to clang usage.
>
> I have this error message:
>
> error: call to implicitly-deleted copy constructor of
>      'std::pair<int, int>'
>
> This is happening when I use a templated list and attempt to make a list of std::pair<int,int>.
>
> This used to work fine but now fails with clang 3.1 with C++11.
>
> Please could someone point me to somewhere where there is discussion on this.  I would like to adapt my code to (a) detect a std::pair and (b) take appropriate action.  I have made some progress with (a) but complete frustration with (b).
>
> It does not look a clever idea to try and put a copy constructor into std::pair.
>
> There are more details at 
> http://c2.com/cgi/wiki?ImplicitlyDeletedCopyConstructor
>
> Thanks
>
> John
>
> Dr John P. Fletcher Tel: (44) 121 204 3389 (direct line), FAX: (44) 
> 121 204 3678 Chemical Engineering and Applied Chemistry (CEAC), 
> formerly Associate Dean - External Relations, School of Engineering 
> and Applied Science (EAS), Aston University, Aston Triangle, 
> BIRMINGHAM B4 7ET  U.K.
>
>
>
>
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