<p>In <a href="https://github.com/mlpack/mlpack/pull/753#discussion_r73809302">src/mlpack/methods/ne/genome.hpp</a>:</p>
<pre style='color:#555'>&gt; +  // Links.
&gt; +  std::vector&lt;LinkGene&gt; aLinkGenes;
&gt; +
&gt; +  // Default constructor.
&gt; +  Genome() {
&gt; +    aId = -1;
&gt; +    aNumInput = 0;
&gt; +    aNumOutput = 0;
&gt; +    aFitness = DBL_MAX;
&gt; +  }
&gt; +  
&gt; +  // Parametric constructor.
&gt; +  Genome(int id,
&gt; +               const std::vector&lt;NeuronGene&gt;&amp; neuronGenes,
&gt; +         const std::vector&lt;LinkGene&gt;&amp; linkGenes,
&gt; +         int numInput,
</pre>
<p>I think it shall make no difference. Besides, it will make a lot of consts.<br>
<a href="http://stackoverflow.com/questions/117293/use-of-const-for-function-parameters">http://stackoverflow.com/questions/117293/use-of-const-for-function-parameters</a></p>

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