<p>In <a href="https://github.com/mlpack/mlpack/pull/732#discussion_r71905001">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>Thanks for sharing that information. I can see you found a real difference in that issue!<br>
Yeah, I use the <code>Compare</code> template parameter when deciding between a max heap and min heap.<br>
So, what I don't understand is: Do you think we can have a real difference between using std::pair with lambda comparison, or using the Candidate struct with the custom operator< ? Even if the code seems to be the same? Is there any special optimization for std::pair?</p>
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