 literal"><span class="pre">std::fill</span></code>,
when invoked with <code class="docutils literal"><span class="pre">iterator_from_2d</span></code>-s, to go through each row using their
base x-iterators, and, if the image has no padding (i.e.
<code class="docutils literal"><span class="pre">iterator_from_2d::is_1d_traversable()</span></code> returns true) to simply iterate
using the x-iterators directly.</p>
</div>
</div>


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