<p>In <a href="https://github.com/mlpack/mlpack/pull/732#discussion_r71935738">src/mlpack/methods/cf/cf.hpp</a>:</p>
<pre style='color:#555'>&gt; +  {
&gt; +    //! Value of this recommendation.
&gt; +    double value;
&gt; +    //! Item of this recommendation.
&gt; +    size_t item;
&gt; +    //! Trivial constructor.
&gt; +    Candidate(double value, size_t item) :
&gt; +        value(value),
&gt; +        item(item)
&gt; +    {};
&gt; +    //! Compare the value of two candidates.
&gt; +    friend bool operator&gt;(const Candidate&amp; l, const Candidate&amp; r)
&gt; +    {
&gt; +      return l.value &gt; r.value;
&gt; +    };
&gt; +  };
</pre>
<p><a href="https://github.com/rcurtin" class="user-mention">@rcurtin</a> , I have tested the modification to use std::pair in <a href="https://github.com/MarcosPividori/mlpack/tree/pair-for-heaps">https://github.com/MarcosPividori/mlpack/tree/pair-for-heaps</a>  and I get the same runtime than when using Candidate structure.</p>

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