<p>In <a href="https://github.com/mlpack/mlpack/pull/686#discussion_r71068544">src/mlpack/methods/ne/neat.hpp</a>:</p>
<pre style='color:#555'>&gt; +          return;
&gt; +        }
&gt; +      }
&gt; +    }
&gt; +
&gt; +    Species newSpecies = Species();
&gt; +    newSpecies.AddGenome(genome);
&gt; +    newSpecies.StaleAge(0);
&gt; +    population.AddSpecies(newSpecies);
&gt; +  }
&gt; +
&gt; +  // Remove stale species.
&gt; +  void RemoveStaleSpecies(Population&amp; population) {
&gt; +    for (ssize_t i=0; i&lt;population.aSpecies.size(); ++i) {
&gt; +      if (population.aSpecies[i].StaleAge() &gt; aStaleAgeThreshold) {
&gt; +        population.RemoveSpecies(i);
</pre>
<p>This function could cause an error, because we can't increase <code>i</code> if we remove a species:</p>

<pre><code>  void RemoveStaleSpecies(Population&amp; population)
  {
    for (std::vector&lt;Species&gt;::iterator it = population.aSpecies.begin();
         it != population.aSpecies.end();  /*it++*/)
    {
      if(it-&gt;StaleAge() &gt; aStaleAgeThreshold)
      {
        it = population.aSpecies.erase(it);
      }
      else
      {
        ++it;
      }
    }
  }
</code></pre>

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