<p>In <a href="https://github.com/mlpack/mlpack/pull/732#discussion_r71894175">src/mlpack/methods/cf/cf.hpp</a>:</p>
<pre style='color:#555'>> + {
> + //! 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;
> + };
> + };
</pre>
<p>Is there a compelling reason to avoid <code>std::pair<></code> here?</p>
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