Re: [Boost-users] [fusion] creating fusion-vectors of references

Subject: Re: [Boost-users] [fusion] creating fusion-vectors of references
From: Christopher Schmidt (christopher_at_[hidden])
Date: 2012-08-03 10:53:05

"Oswin Krause" <Oswin.Krause_at_[hidden]> writes:
> Unfortunately my problem is not calculating the correct types (like
> fusion::vector<A&,B&,C&> from the Tuple). As my example suggests, I have a
> problem of creating the actual object after deducing the correct types.
>
> One of the errors I get is for example( after using const_cast to get the
> correct reference, see problem 1.):
> boost/include/boost/fusion/container/vector/detail/preprocessed/vector10.hpp:101:9:
> error: value-initialization of ‘int& boost::fusion::vector_data2<int&, double&>
>>::m0’, which has reference type
>
> in the sequence constructor of vector_data2. So what happens is that
> fusion::vector assumes, that m0 is default constructible (references are not)
> and that then every object can be set to the correct value with operator= (which
> is not possible for references).

Initialise from a fusion sequence of objects that are convertible to
your target references.

        Christopher