Re: [Boost-users] Boost fusion problem

Subject: Re: [Boost-users] Boost fusion problem
From: Jess Morecroft (jess_at_[hidden])
Date: 2016-05-29 21:52:09

Hi Lee,

We actually noticed that by changing the tuple to a (fusion) vector, it
just works. This was unexpected as we'd thought/read in the boost doc that
tuple was just effectively an alias for a vector, but apparently not. This
is good enough for us so no solution required beyond this.

Regards
Jess

On 25 May 2016 at 15:13, Lee Clagett <forum_at_[hidden]> wrote:

> On Tue, 24 May 2016 19:09:02 +1000
> Jess Morecroft <jess_at_[hidden]> wrote:
>
> > Hi guys,
> >
> > We're trying out the latest version of Boost (1.61, migrating from
> > 1.55) and have some code calling the fusion library that now doesn't
> > compile and it's not obvious (to me at least) why. I've created a
> > simple program (below) to demonstrate the issue. As per the
> > compile/run section below, this compiles and runs with Boost 1.55,
> > not with 1.61.
> >
> > If anyone has any idea or pointers to what is wrong here I'd really
> > appreciate it. Sorry if this isn't the right forum for this kind of
> > issue too - if so please let me know how best to seek help on this.
> >
> > Regards
> > Jess
>
> This is a regression caused by the upgrades for C++11. Compiling in
> C++03 mode still works with Boost 1.61. The problem is the nested
> sequence, the new C++11 version is trying to unpack the inner sequence
> for a conversion move when it should be moving the entire inner
> sequence. The problem is caused by the [incorrect dispatch method][0]
> being selected. Little late for me to attempt a fix, but I should be
> able to do a bit later this week if no one else can.
>
> Lee
>
> [0]
> https://github.com/boostorg/fusion/blob/master/include/boost/fusion/container/vector/vector.hpp#L99
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