<p>Nice catch!  You are absolutely correct, and that indeed is not something that is wanted. :)</p>

<p>I added <code>std::cout &lt;&lt; "delete CLI\n";</code> to <code>CLIDeleter::~CLIDeleter()</code> and got some lovely output at the end of an <code>mlpack_allknn</code> run:</p>

<pre><code>...

[INFO ] Program timers:

[INFO ]   computing_neighbors: 0.059620s

[INFO ]   loading_data: 0.005533s

[INFO ]   total_time: 0.068139s

[INFO ]   tree_building: 0.001401s

delete CLI!

</code></pre>

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