<p>In <a href="https://github.com/mlpack/mlpack/pull/686#discussion_r69383600">src/mlpack/methods/ne/neat.hpp</a>:</p>
<pre style='color:#555'>> + return -1;
> + }
> +
> + // Add a new link innovation.
> + LinkInnovation AddLinkInnovation(ssize_t fromNeuronId, ssize_t toNeuronId) {
> + LinkInnovation linkInnov;
> + linkInnov.fromNeuronId = fromNeuronId;
> + linkInnov.toNeuronId = toNeuronId;
> + linkInnov.newLinkInnovId = aNextLinkInnovId++;
> + aLinkInnovations.push_back(linkInnov);
> +
> + return linkInnov;
> + }
> +
> + // Add a new neuron innovation.
> + NeuronInnovation AddNeuronInnovation(ssize_t splitLinkInnovId) {
</pre>
<p>This also looks like if we would use a reference we could avoid an extra copy:</p>
<p><code><br>
AddNeuronInnovation(ssize_t splitLinkInnovId, NeuronInnovation& neuronInnov)<br>
</code></p>
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