Re: [Boost-users] [fusion] .at<N>() template member in containers?

Subject: Re: [Boost-users] [fusion] .at<N>() template member in containers?
From: Alfredo Correa (alfredo.correa_at_[hidden])
Date: 2010-10-06 16:36:28

On Wed, Oct 6, 2010 at 1:21 PM, Frank Mori Hess <frank.hess_at_[hidden]> wrote:

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> On Wednesday 06 October 2010, alfC wrote:
> > Hi,
> >
> >  Excuse my simple minded questions. Sometimes by asking this question
> > (often with negative answer) I understand more on the design of the
> > Boost libraries.
> >
> > Besides possible redundancy, why is that the fusion containers, for
> > example fusion::vector, doesn't have a template member function to
> > extract elements?
> >
> >  fusion::vector<double, int, std::string> stuff(1.2, 3, "hola");
> >  stuff.at<2>(); //returns "hola", just like at_c<2>(stuff);
>
> Wouldn't that require template specializations of the "at()" member
> template
> for its differing return types?  IIRC, C++ doesn't let you specialize
> template members of template classes.
>

It does not seem to be a technical problem, tuples have member functions

tuples<int, double, string> t;
t.get<2>(); // a string

>
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