Re: [boost] [move] problem with msvc and BOOST_MOVABLE_BUT_NOT_COPYABLE

Subject: Re: [boost] [move] problem with msvc and BOOST_MOVABLE_BUT_NOT_COPYABLE
From: Thomas Klimpel (Thomas.Klimpel_at_[hidden])
Date: 2010-05-27 15:28:22

Oliver Kowalke wrote:
> I get an linker error (private: __thiscall X::X(class X &) is
> unresolved symbol) with msvc-9.0 on XP.
> AFAIL (docu) implementing the copy-ctor isn't required and passing
> values from static memeber functions are allowed.
> 
> What's wrong?
[snip] 
> X X::create()
> {
>     X x;
>     return x; // passing value form static memeber-fn
> }

The statement "return x" must make some constructor call. As x is not a temporary, the compiler must call the copy constructor. It will probably work if you write "return boost::move(x)" or "return X()".

Regards,
Thomas