Re: [Boost-bugs] [Boost C++ Libraries] #7718: Basic rvalue and C++11 support (part 2)

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #7718: Basic rvalue and C++11 support (part 2)
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2013-01-20 15:32:00

#7718: Basic rvalue and C++11 support (part 2)
---------------------------+------------------------------------------------
  Reporter:  apolukhin     |       Owner:  ebf         
      Type:  Patches       |      Status:  reopened    
 Milestone:  Boost 1.53.0  |   Component:  variant     
   Version:  Boost 1.52.0  |    Severity:  Optimization
Resolution:                |    Keywords:              
---------------------------+------------------------------------------------

Comment (by djowel):

 Let me quote in case you missed it:

 On 1/11/13 11:02 PM, Paul Smith wrote:
 > On Fri, Jan 11, 2013 at 4:18 PM, Peter Dimov <lists_at_[hidden]> wrote:
 >> If the variant could be empty, or equivalently, if the variant always
 >> contained a type that can be reliably default-constructed (without an
 >> exception) such as int, the problems with assignment (both copy- and
 move-)
 >> and with move construction do not occur, because the target can be left
 >> holding the int.
 >>
 >> So, one option is to enable move only in this case.
 >
 > That's the first constructive solution so far. Something like:
 >
 > template <typename T>
 > struct is_legitimate_move_target // specialize me
 >    : has_trivial_constructor<T> {};

 Paul, I agree!

 Peter, I like the direction this is heading to. I really appreciate
 your interest in this.

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/7718#comment:11>
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