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</pre><pre class="rust"><code><span class="kw">use </span>std::iter::Fuse;
<span class="kw">use </span>size_hint;
<span class="doccomment">/// An iterator adaptor that pads a sequence to a minimum length by filling
/// missing elements using a closure.
///
/// Iterator element type is `I::Item`.
///
/// See [`.pad_using()`](../trait.Itertools.html#method.pad_using) for more information.
</span><span class="attribute">#[derive(Clone)]
#[must_use = <span class="string">&quot;iterator adaptors are lazy and do nothing unless consumed&quot;</span>]
</span><span class="kw">pub struct </span>PadUsing&lt;I, F&gt; {
iter: Fuse&lt;I&gt;,
min: usize,
pos: usize,
filler: F,
}
<span class="doccomment">/// Create a new **PadUsing** iterator.
</span><span class="kw">pub fn </span>pad_using&lt;I, F&gt;(iter: I, min: usize, filler: F) -&gt; PadUsing&lt;I, F&gt;
<span class="kw">where </span>I: Iterator,
F: FnMut(usize) -&gt; I::Item
{
PadUsing {
iter: iter.fuse(),
min: min,
pos: <span class="number">0</span>,
filler: filler,
}
}
<span class="kw">impl</span>&lt;I, F&gt; Iterator <span class="kw">for </span>PadUsing&lt;I, F&gt;
<span class="kw">where </span>I: Iterator,
F: FnMut(usize) -&gt; I::Item
{
<span class="kw">type </span>Item = I::Item;
<span class="attribute">#[inline]
</span><span class="kw">fn </span>next(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;I::Item&gt; {
<span class="kw">match </span><span class="self">self</span>.iter.next() {
<span class="prelude-val">None </span>=&gt; {
<span class="kw">if </span><span class="self">self</span>.pos &lt; <span class="self">self</span>.min {
<span class="kw">let </span>e = <span class="prelude-val">Some</span>((<span class="self">self</span>.filler)(<span class="self">self</span>.pos));
<span class="self">self</span>.pos += <span class="number">1</span>;
e
} <span class="kw">else </span>{
<span class="prelude-val">None
</span>}
},
e =&gt; {
<span class="self">self</span>.pos += <span class="number">1</span>;
e
}
}
}
<span class="kw">fn </span>size_hint(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; (usize, <span class="prelude-ty">Option</span>&lt;usize&gt;) {
<span class="kw">let </span>tail = <span class="self">self</span>.min.saturating_sub(<span class="self">self</span>.pos);
size_hint::max(<span class="self">self</span>.iter.size_hint(), (tail, <span class="prelude-val">Some</span>(tail)))
}
}
<span class="kw">impl</span>&lt;I, F&gt; DoubleEndedIterator <span class="kw">for </span>PadUsing&lt;I, F&gt;
<span class="kw">where </span>I: DoubleEndedIterator + ExactSizeIterator,
F: FnMut(usize) -&gt; I::Item
{
<span class="kw">fn </span>next_back(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;I::Item&gt; {
<span class="kw">if </span><span class="self">self</span>.min == <span class="number">0 </span>{
<span class="self">self</span>.iter.next_back()
} <span class="kw">else if </span><span class="self">self</span>.iter.len() &gt;= <span class="self">self</span>.min {
<span class="self">self</span>.min -= <span class="number">1</span>;
<span class="self">self</span>.iter.next_back()
} <span class="kw">else </span>{
<span class="self">self</span>.min -= <span class="number">1</span>;
<span class="prelude-val">Some</span>((<span class="self">self</span>.filler)(<span class="self">self</span>.min))
}
}
}
<span class="kw">impl</span>&lt;I, F&gt; ExactSizeIterator <span class="kw">for </span>PadUsing&lt;I, F&gt;
<span class="kw">where </span>I: ExactSizeIterator,
F: FnMut(usize) -&gt; I::Item
{}
</code></pre></div>
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