Re: [Boost-users] [fusion] transform a heterogeneous vector

Subject: Re: [Boost-users] [fusion] transform a heterogeneous vector
From: Christopher Schmidt (mr.chr.schmidt_at_[hidden])
Date: 2009-09-20 12:01:45

Fusion uses boost::result_of to determine the return type of a call 
expression. Therefore you just need to define a result-metafunction.

struct triple
{
        template<typename Sig>
        struct result;

        template<typename Self, typename Arg>
        struct result<Self(Arg)>
        {
                typedef Arg type;
        };

        //...
};

-Christopher

Jean-Louis Leroy schrieb:
> ...all the elements have the same type. How can it work with 
> heterogeneous vectors ? What would be typedef'ed to result_type ?
> 
> Jean-Louis