Re: [boost] [fusion] fusion sequence of non-copy-constructible types

From: Steven Watanabe (watanabesj_at_[hidden])
Date: 2008-07-07 12:25:29

AMDG

oliver wrote:
> what i really wanna do is not to name the objects i put i the 
> fusion vector.
> they should be constructed in place and only be accessed through the 
> fusion vector.
> should look something like this:
>
> typedef boost::fusion::vector<JobA, JobB, JobC> tJobs;
> struct System
> {
>   System(Da& da) : fJobs(JobA(da), JobB(da, 2), JobC(da, 3))
>   {}
> private:
>   tJobs  fJobs;
> };
>   

This exact syntax cannot be implemented without a copy constructor.
JobA(da) creates a temporary JobA which is then copied into the
fusion::vector.  You would have to use something like

fJobs(boost::in_place(da), boost::in_place(da, 2), boost::in_place(da, 3))

In Christ,
Steven Watanabe