Re: [Boost-users] [Fusion] Assignement from adapted struct to tuple

Subject: Re: [Boost-users] [Fusion] Assignement from adapted struct to tuple
From: Steven Watanabe (watanabesj_at_[hidden])
Date: 2011-03-29 10:44:15

AMDG

On 03/29/2011 06:50 AM, Samuel Debionne wrote:
> Hello all,
> While I managed to assign an adapted structure to a fusion vector, I
> fail to assign the same structure to a legacy tuple. The doc doesn't
> mention the assignement operator between two sequences, but I though it
> would work. Am I missing something ?
>

First of all, this isn't assignment, it's
copy construction.  Second, boost::tuple
doesn't know anything about Fusion.  It doesn't
have a constructor that takes an arbitrary Fusion
sequence.

> #include <boost/fusion/include/vector.hpp>
> #include <boost/fusion/include/adapt_struct.hpp>
> #include <boost/fusion/include/boost_tuple.hpp>
>
> struct my_struct {
> double a;
> int b;
> char c;
> };
>
> BOOST_FUSION_ADAPT_STRUCT(
> my_struct,
> (double, a)
> (int, b)
> (char, c));
>
> my_struct src;
> boost::fusion::vector<double, int, char> dest1 = src; //OK
> boost::tuple<double, int, char> dest2 = src; //Fails
>

In Christ,
Steven Watanabe