[mlpack-git] [mlpack/mlpack] Heaps for mlpack! (#732)

[Ryan Curtin]

> +  {
> +    //! Value of this recommendation.
> +    double value;
> +    //! Item of this recommendation.
> +    size_t item;
> +    //! Trivial constructor.
> +    Candidate(double value, size_t item) :
> +        value(value),
> +        item(item)
> +    {};
> +    //! Compare the value of two candidates.
> +    friend bool operator>(const Candidate& l, const Candidate& r)
> +    {
> +      return l.value > r.value;
> +    };
> +  };

That makes sense---there is not much reason to believe that `std::pair<>` is intrinsically faster than a handwritten class that implements the same functionality.  My leaning towards `pair` is primarily a function of minimizing code, but it is not a huge preference. :)

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