<p>In <a href="https://github.com/mlpack/mlpack/pull/694#discussion_r69485681">src/mlpack/core/data/dataset_info_impl.hpp</a>:</p>
<pre style='color:#555'>&gt; @@ -127,6 +125,13 @@ inline PolicyType&amp; DatasetMapper&lt;PolicyType&gt;::Policy()
&gt;    return this-&gt;policy;
&gt;  }
&gt;  
&gt; +template&lt;typename PolicyType&gt;
&gt; +inline void DatasetMapper&lt;PolicyType&gt;::Policy(PolicyType&amp; policy)
&gt; +{
&gt; +  this-&gt;policy = std::move(policy);
</pre>
<p>thanks for the resource, I now understand the concepts now.</p>

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