<p>In <a href="https://github.com/mlpack/mlpack/pull/753#discussion_r73802116">src/mlpack/methods/ne/genome.hpp</a>:</p>
<pre style='color:#555'>> + aId = genome.aId;
> + aNeuronGenes = genome.aNeuronGenes;
> + aLinkGenes = genome.aLinkGenes;
> + aNumInput = genome.aNumInput;
> + aNumOutput = genome.aNumOutput;
> + aFitness = genome.aFitness;
> + }
> +
> + return *this;
> + }
> +
> + // Get genome id.
> + int Id() const { return aId; }
> +
> + // Set genome id.
> + void Id(int id) { aId = id; }
</pre>
<p>Generally we use a setter function that takes the input as an argument if it's necessary to validate what the user is setting the value to. Otherwise, we use a function that allows a direct access e.g.:</p>
<pre><code>//! Get the genome id.
int Id() const { return id; }
//! Modify the genome id.
int& Id() { return id; }
</code></pre>
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