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<p><em>This page is a snapshot from the LWG issues list, see the <a href="lwg-active.html">Library Active Issues List</a> for more information and the meaning of <a href="lwg-active.html#New">New</a> status.</em></p>
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<h3 id="4226"><a href="lwg-active.html#4226">4226</a>. <code>to_input_view::<i>iterator</i></code> cannot be compared to its <code class='backtick'>const</code> sentinel</h3>
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<p><b>Section:</b> 99 [range.to.input.view] <b>Status:</b> <a href="lwg-active.html#New">New</a>
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<b>Submitter:</b> Hewill Kang <b>Opened:</b> 2025-03-15 <b>Last modified:</b> 2025-03-15</p>
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<p><b>Section:</b> 99 [range.to.input] <b>Status:</b> <a href="lwg-active.html#New">New</a>
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<b>Submitter:</b> Hewill Kang <b>Opened:</b> 2025-03-15 <b>Last modified:</b> 2025-03-16</p>
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<p><b>Priority: </b>Not Prioritized
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</p>
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<p><b>View all issues with</b> <a href="lwg-status.html#New">New</a> status.</p>
@@ -111,6 +111,211 @@ <h3 id="4226"><a href="lwg-active.html#4226">4226</a>. <code>to_input_view::<i>i
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<p id="res-4226"><b>Proposed resolution:</b></p>
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<p>
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This wording is relative to the <a href="https://github.com/cplusplus/draft/actions/runs/13875532168/artifacts/2758179972">
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working draft just after application of the Hagenberg motions</a>.
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</p>
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<ol>
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<li><p>Modify [range.to.input.view] as indicated:</p>
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<blockquote>
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<blockquote>
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<pre>
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namespace std::ranges {
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template&lt;input_range V&gt;
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requires view&lt;V&gt;
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class to_input_view : public view_interface&lt;to_input_view&lt;V&gt;&gt; {
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V <i>base_</i> = V(); // <i>exposition only</i>
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template&lt;bool Const&gt;
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class <i>iterator</i>; // <i>exposition only</i>
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<ins>template&lt;bool Const&gt;
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class <i>sentinel</i>; // <i>exposition only</i></ins>
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[&hellip;]
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};
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[&hellip;]
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}
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</pre>
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</blockquote>
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[&hellip;]
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<pre>
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constexpr auto end() requires (!<i>simple-view</i>&lt;V&gt;);
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</pre>
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<blockquote>
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<p>
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<ins>-?- <i>Effects</i>: Equivalent to:</ins>
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</p>
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<pre>
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<ins>return <i>sentinel</i>&lt;false&gt;(ranges::end(<i>base_</i>));</ins>
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</pre>
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</blockquote>
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<pre>
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constexpr auto end() const requires range&lt;const V&gt;;
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</pre>
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<blockquote>
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<p>
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-4- <i>Effects</i>: Equivalent to:
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</p>
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<pre>
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return <ins><i>sentinel</i>&lt;true&gt;(</ins>ranges::end(<i>base_</i>)<ins>)</ins>;
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</pre>
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</blockquote>
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</blockquote>
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</li>
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<li><p>Modify [range.to.input.iterator] as indicated:</p>
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<blockquote>
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<blockquote>
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<pre>
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namespace std::ranges {
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template&lt;input_range V&gt;
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requires view&lt;V&gt;
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template&lt;bool Const&gt;
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class to_input_view&lt;V&gt;::<i>iterator</i> {
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[&hellip;]
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<del>friend constexpr bool operator==(const <i>iterator</i>&amp; x, const sentinel_t&lt;<i>Base</i>&gt;&amp; y);
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friend constexpr difference_type operator-(const sentinel_t&lt;<i>Base</i>&gt;&amp; y, const <i>iterator</i>&amp; x)
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requires sized_sentinel_for&lt;sentinel_t&lt;<i>Base</i>&gt;, iterator_t&lt;<i>Base</i>&gt;&gt;;
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friend constexpr difference_type operator-(const <i>iterator</i>&amp; x, const sentinel_t&lt;<i>Base</i>&gt;&amp; y)
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requires sized_sentinel_for&lt;sentinel_t&lt;<i>Base</i>&gt;, iterator_t&lt;<i>Base</i>&gt;&gt;;</del>
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[&hellip;]
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};
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}
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</pre>
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</blockquote>
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[&hellip;]
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<pre><del>
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friend constexpr bool operator==(const <i>iterator</i>&amp; x, const sentinel_t&lt;<i>Base</i>&gt;&amp; y);</del>
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</pre>
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<blockquote>
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<p>
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<del>-7- <i>Returns</i>: <code>x.<i>current_</i> == y</code>.</del>
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</p>
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</blockquote>
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<pre><del>
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friend constexpr difference_type operator-(const sentinel_t&lt;<i>Base</i>&gt;&amp; y, const <i>iterator</i>&amp; x)
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requires sized_sentinel_for&lt;sentinel_t&lt;<i>Base</i>&gt;, iterator_t&lt;<i>Base</i>&gt;&gt;;</del>
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</pre>
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<blockquote>
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<p>
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<del>-8- <i>Returns</i>: <code>y - x.<i>current_</i></code>.</del>
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</p>
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</blockquote>
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<pre><del>
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friend constexpr difference_type operator-(const <i>iterator</i>&amp; x, const sentinel_t&lt;<i>Base</i>&gt;&amp; y)
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requires sized_sentinel_for&lt;sentinel_t&lt;<i>Base</i>&gt;, iterator_t&lt;<i>Base</i>&gt;&gt;;</del>
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</pre>
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<blockquote>
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<p>
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<del>-9- <i>Returns</i>: <code>x.<i>current_</i> - y</code>.</del>
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</p>
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</blockquote>
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</blockquote>
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</li>
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<li><p>Add [range.to.input.sentinel] after [range.to.input.iterator] as indicated:</p>
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<blockquote>
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<blockquote>
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<pre><ins>
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namespace std::ranges {
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template&lt;input_range V&gt;
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requires view&lt;V&gt;
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template&lt;bool Const&gt;
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class to_input_view&lt;V&gt;::<i>sentinel</i> {
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using <i>Base</i> = <i>maybe-const</i>&lt;Const, V&gt;; // <i>exposition only</i>
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sentinel_t&lt;<i>Base</i>&gt; <i>end_</i> = sentinel_t&lt;<i>Base</i>&gt;(); // <i>exposition only</i>
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constexpr explicit <i>sentinel</i>(sentinel_t&lt;<i>Base</i>&gt; end); // <i>exposition only</i>
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public:
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<i>sentinel</i>() = default;
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constexpr <i>sentinel</i>(<i>sentinel</i>&lt;!Const&gt; other)
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requires Const &amp;&amp; convertible_to&lt;sentinel_t&lt;V&gt;, sentinel_t&lt;<i>Base</i>&gt;&gt;;
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constexpr sentinel_t&lt;Base&gt; base() const;
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template&lt;bool OtherConst&gt;
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requires sentinel_for&lt;sentinel_t&lt;Base&gt;, iterator_t&lt;<i>maybe-const</i>&lt;OtherConst, V&gt;&gt;&gt;
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friend constexpr bool operator==(const <i>iterator</i>&lt;OtherConst&gt;&amp; x, const <i>sentinel</i>&amp; y);
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template&lt;bool OtherConst&gt;
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requires sized_sentinel_for&lt;sentinel_t&lt;<i>Base</i>&gt;, iterator_t&lt;<i>maybe-const</i>&lt;OtherConst, V&gt;&gt;&gt;
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friend constexpr range_difference_t&lt;<i>maybe-const</i>&lt;OtherConst, V&gt;&gt;
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operator-(const <i>iterator</i>&lt;OtherConst&gt;&amp; x, const <i>sentinel</i>&amp; y);
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template&lt;bool OtherConst&gt;
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requires sized_sentinel_for&lt;sentinel_t&lt;<i>Base</i>&gt;, iterator_t&lt;<i>maybe-const</i>&lt;OtherConst, V&gt;&gt;&gt;
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friend constexpr range_difference_t&lt;<i>maybe-const</i>&lt;OtherConst, V&gt;&gt;
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operator-(const <i>sentinel</i>&amp; x, const <i>iterator</i>&lt;OtherConst&gt;&amp; y);
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};
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}</ins>
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</pre>
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</blockquote>
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<pre><ins>
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constexpr explicit <i>sentinel</i>(sentinel_t&lt;<i>Base</i>&gt; end);</ins>
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</pre>
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<blockquote>
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<p>
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<ins>-?- <i>Effects</i>: Initializes <code><i>end_</i></code> with <code>std::move(end)</code>.</ins>
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</p>
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</blockquote>
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<pre><ins>
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constexpr <i>sentinel</i>(<i>sentinel</i>&lt;!Const&gt; other)
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requires Const &amp;&amp; convertible_to&lt;sentinel_t&lt;V&gt;, sentinel_t&lt;<i>Base</i>&gt;&gt;;</ins>
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</pre>
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<blockquote>
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<p>
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<ins>-?- <i>Effects</i>: Initializes <code><i>end_</i></code> with <code>std::move(other.<i>end_</i>)</code>.</ins>
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</p>
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</blockquote>
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<pre><ins>
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constexpr sentinel_t&lt;Base&gt; base() const;</ins>
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</pre>
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<blockquote>
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<p>
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<ins>-?- <i>Effects</i>: Equivalent to: <code>return <i>end_</i>;</code></ins>
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</p>
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</blockquote>
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<pre><ins>
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template&lt;bool OtherConst&gt;
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requires sentinel_for&lt;sentinel_t&lt;Base&gt;, iterator_t&lt;<i>maybe-const</i>&lt;OtherConst, V&gt;&gt;&gt;
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friend constexpr bool operator==(const <i>iterator</i>&lt;OtherConst&gt;&amp; x, const <i>sentinel</i>&amp; y);</ins>
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</pre>
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<blockquote>
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<p>
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<ins>-?- <i>Effects</i>: Equivalent to: <code>return x.<i>current_</i> == y.<i>end_</i>;</code></ins>
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</p>
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</blockquote>
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<pre><ins>
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template&lt;bool OtherConst&gt;
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requires sized_sentinel_for&lt;sentinel_t&lt;<i>Base</i>&gt;, iterator_t&lt;<i>maybe-const</i>&lt;OtherConst, V&gt;&gt;&gt;
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friend constexpr range_difference_t&lt;<i>maybe-const</i>&lt;OtherConst, V&gt;&gt;
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operator-(const <i>iterator</i>&lt;OtherConst&gt;&amp; x, const <i>sentinel</i>&amp; y);</ins>
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</pre>
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<blockquote>
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<p>
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<ins>-?5- <i>Effects</i>: Equivalent to: <code>return x.<i>current_</i> - y.<i>end_</i>;</code></ins>
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</p>
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</blockquote>
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<pre><ins>
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template&lt;bool OtherConst&gt;
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requires sized_sentinel_for&lt;sentinel_t&lt;<i>Base</i>&gt;, iterator_t&lt;<i>maybe-const</i>&lt;OtherConst, V&gt;&gt;&gt;
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friend constexpr range_difference_t&lt;<i>maybe-const</i>&lt;OtherConst, V&gt;&gt;
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operator-(const <i>sentinel</i>&amp; x, const <i>iterator</i>&lt;OtherConst&gt;&amp; y);</ins>
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</pre>
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<blockquote>
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<p>
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<ins>-6- <i>Effects</i>: Equivalent to: <code>return x.<i>end_</i> - y.<i>current_</i>;</code></ins>
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</p>
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</blockquote>
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</blockquote>
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</li>
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</ol>
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