Re: [Boost-users] Tuple use/overuse?

From: Graham Reitz (graham.cpp_at_[hidden])
Date: 2007-07-26 11:00:14

Great discussion!   Thanks folks.

Also, I didn't know that tuples and struct are interchangeable.

Graham

On 7/26/07, Jeff Flinn <TriumphSprint2000_at_[hidden]> wrote:
>
> Graham Reitz wrote:
> > Ok good.  So it sounds like my concern isn't justified.
> >
> > To be certain.  Because of tuples I prefer this:
> >
> > typedef boost::tuples::tuple<unsigned int, double> some_pair;
> > typedef std::vector<some_pair > some_pairs;
> >
> > to this:
> > struct some_pair
> > { unsigned int i; double d; };
> > typedef std::vector<some_pair > some_pairs;
> >
> > Is tuples meant to be used like the first example?
>
> I use tuples or fusion containers when the names of the data members
> have no meaning, and you want to iterate over the members in some way.
> Your example, with it's members i and d, obviously falls into this
> category. ;)
>
> I've also used tie to get the best of both worlds:
>
> class tire_size
> {
>     int    width;
>     int    aspect_ratio;
>     string speed_rating;
>     int    wheel_diameter;
> public:
>
>     ...
>
>     bool operator<( const tire_size& rhs )const
>     {
>        return tie( width
>                  , aspect_ratio
>                  , speed_rating
>                  , wheel_diameter
>                  )
>             < tie( rhs.width,
>                  , rhs.aspect_ratio
>                  , rhs.speed_rating
>                  , rhs.wheel_diameter
>                  );
>     }
> };
>
> int main()
> {
>     tire_size summer911turbo(295,30,"Z",18);
>     tire_size winter911rurbo(265,35,"H",18);
>
>     bool b = winter911turbo < summer911turbo;
>
>     return 0;
> };
>
> Jeff Flinn
>
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