On Wed, 21 Jan 2015 08:39:46 +0100
Murray Cumming <murr...@murrayc.com> wrote:
> On Sun, 2014-12-28 at 15:42 +0100, Christof Meerwald wrote:
> > Hi,
> > 
> > just wondering if anyone has given any thought on C++11 features for
> > gtkmm.
> > 
> > One thing that seems very unfortunate is that all objects are
> > non-movable (due to them being explicitly made non-copyable which
> > then also deletes the move constructor).
> [snip]
> 
> I believe it's possible to make classes movable but not copyable. That
> feels strange to me, but maybe that's just because I'm not using C++11
> day to day. I hope that this wouldn't lead to code that looked too
> much like the widgets were being copied. I can imagine a lot of
> confusion from less experienced coders.

It is possible (the canonical example is of course std::unique_ptr) and
it does not confuse, because lvalues can only be moved by converting
them to rvalues, in other words by calling std::move on them.  Calling
std::move makes it clear, I think, that no copying is involved.

Chris
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