Re: [boost] [variant] Why no move emulation with Boost.Move for C++03?

Subject: Re: [boost] [variant] Why no move emulation with Boost.Move for C++03?
From: Ion Gaztañaga (igaztanaga_at_[hidden])
Date: 2014-04-14 08:32:08

El 13/04/2014 14:59, Steven Watanabe escribió:
> AMDG
>
> On 04/12/2014 02:33 PM, Andrzej Krzemienski wrote:
>> Hi,
>> I am trying to figure out what the best way to enable move semantics in
>> Boost.Optional. I tried to pick at how Boost.Variant does it. If I
>> understand correctly, move operations are only defined if compiler supports
>> rvalue references. I wonder why it doesn't use Boost.Move, which would
>> enable move semantics even for compilers w/o rvalue references. Is there
>> any reason for this (that I should also take into account for
>> Boost.Optional)?
>>
>
> Boost.Move is not completely backwards
> compatible.  i.e. adding it to an existing
> class can break user code.

If the assignment operator is a major problem, we can define another 
alternative that can be less efficient in some contexts but maintain 
assignment operator intact.

Best,

Ion