<p>In <a href="https://github.com/mlpack/mlpack/pull/746#discussion_r76256828">src/mlpack/core/tree/address.hpp</a>:</p>
<pre style='color:#555'>> + point(i) = std::numeric_limits<VecElemType>::lowest();
> + }
> + }
> +}
> +
> +/**
> + * Compare two addresses. The function returns 1 if the first address is greater
> + * than the second one, -1 if the first address is less than the second one,
> + * otherwise the function returns 0.
> + */
> +template<typename AddressType1, typename AddressType2>
> +int CompareAddresses(const AddressType1& addr1, const AddressType2& addr2)
> +{
> + static_assert(sizeof(typename AddressType1::elem_type) ==
> + sizeof(typename AddressType2::elem_type), "We aren't able to compare "
> + "adresses of distinct sizes");
</pre>
<p>The type of an address is either <code>uint32_t</code> or <code>uint64_t</code></p>
<pre><code>typedef typename std::conditional<sizeof(ElemType) * CHAR_BIT <= 32,
uint32_t,
uint64_t>::type AddressElemType;
</code></pre>
<p>So, there is no difference. But maybe you are right and it is better to check types instead of sizes.</p>
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