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  <title>Wording for GB301, US296, US292, US291, and US283</title>
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<h1 class="title" style="text-align:center">Wording for GB301, US296, US292, US291, and US283</h1>

<table style="border:none;float:right">
  <tr>
    <td>Document #: </td>
    <td>P1983R0</td>
  </tr>
  <tr>
    <td>Date: </td>
    <td>2019-11-15</td>
  </tr>
  <tr>
    <td style="vertical-align:top">Project: </td>
    <td>Programming Language C++<br>
      LWG<br>
    </td>
  </tr>
  <tr>
    <td style="vertical-align:top">Reply-to: </td>
    <td>
      Tim Song<br>&lt;<a href="mailto:t.canens.cpp@gmail.com" class="email">t.canens.cpp@gmail.com</a>&gt;<br>
    </td>
  </tr>
</table>

</header>
<div style="clear:both">
<h1 id="introduction" style="border-bottom:1px solid #cccccc"><span class="header-section-number">1</span> Introduction<a href="#introduction" class="self-link"></a></h1>
<p>This paper provides combined wording for NB comments GB301, US296, US292, US291, and US283, all minor Ranges issues. It also resolves <a href="https://wg21.link/LWG3278">LWG issue 3278</a>.</p>
<h1 id="wording" style="border-bottom:1px solid #cccccc"><span class="header-section-number">2</span> Wording<a href="#wording" class="self-link"></a></h1>
<p>This wording is relative to <span class="citation" data-cites="N4835">[<a href="#ref-N4835" role="doc-biblioref">N4835</a>]</span>.</p>
<h2 id="gb301-add-filter_viewpred-accessor"><span class="header-section-number">2.1</span> <a href="https://github.com/cplusplus/nbballot/issues/297">GB301</a> Add <code class="sourceCode cpp">filter_view<span class="op">::</span>pred<span class="op">()</span></code> accessor<a href="#gb301-add-filter_viewpred-accessor" class="self-link"></a></h2>
<p>Edit <span>24.7.4.2 <a href="https://wg21.link/range.filter.view">[range.filter.view]</a></span>, class template <code class="sourceCode cpp">filter_view</code> synopsis, as indicated:</p>
<blockquote>
<div>
<div class="sourceCode" id="cb1"><pre class="sourceCode diff"><code class="sourceCode diff"><span id="cb1-1"><a href="#cb1-1"></a> namespace std::ranges {</span>
<span id="cb1-2"><a href="#cb1-2"></a>   template&lt;input_range V, indirect_unary_predicate&lt;iterator_t&lt;V&gt;&gt; Pred&gt;</span>
<span id="cb1-3"><a href="#cb1-3"></a>     requires view&lt;V&gt; &amp;&amp; is_object_v&lt;Pred&gt;</span>
<span id="cb1-4"><a href="#cb1-4"></a>   class filter_view : public view_interface&lt;filter_view&lt;V, Pred&gt;&gt; {</span>
<span id="cb1-5"><a href="#cb1-5"></a>     <em>[…]</em></span>
<span id="cb1-6"><a href="#cb1-6"></a>   public:</span>
<span id="cb1-7"><a href="#cb1-7"></a>     filter_view() = default;</span>
<span id="cb1-8"><a href="#cb1-8"></a>     constexpr filter_view(V base, Pred pred);</span>
<span id="cb1-9"><a href="#cb1-9"></a>     template&lt;input_range R&gt;</span>
<span id="cb1-10"><a href="#cb1-10"></a>       requires viewable_range&lt;R&gt; &amp;&amp; constructible_from&lt;V, all_view&lt;R&gt;&gt;</span>
<span id="cb1-11"><a href="#cb1-11"></a>     constexpr filter_view(R&amp;&amp; r, Pred pred);</span>
<span id="cb1-12"><a href="#cb1-12"></a></span>
<span id="cb1-13"><a href="#cb1-13"></a>     constexpr V base() const;</span>
<span id="cb1-14"><a href="#cb1-14"></a><span class="va">+    constexpr const Pred&amp; pred() const;</span></span>
<span id="cb1-15"><a href="#cb1-15"></a></span>
<span id="cb1-16"><a href="#cb1-16"></a>     <em>[…]</em></span>
<span id="cb1-17"><a href="#cb1-17"></a>   };</span>
<span id="cb1-18"><a href="#cb1-18"></a></span>
<span id="cb1-19"><a href="#cb1-19"></a>   template&lt;class R, class Pred&gt;</span>
<span id="cb1-20"><a href="#cb1-20"></a>     filter_view(R&amp;&amp;, Pred) -&gt; filter_view&lt;all_view&lt;R&gt;, Pred&gt;;</span>
<span id="cb1-21"><a href="#cb1-21"></a> }</span></code></pre></div>
</div>
</blockquote>
<p>In <span>24.7.4.2 <a href="https://wg21.link/range.filter.view">[range.filter.view]</a></span>, insert the following after p3:</p>
<div class="add" style="color: #006e28">

<blockquote>
<div class="sourceCode" id="cb2"><pre class="sourceCode cpp"><code class="sourceCode cpp"><span id="cb2-1"><a href="#cb2-1"></a><span class="kw">constexpr</span> <span class="kw">const</span> Pred<span class="op">&amp;</span> pred<span class="op">()</span> <span class="kw">const</span>;</span></code></pre></div>
<p><span class="marginalizedparent"><a class="marginalized">?</a></span> <em>Effects</em>: Equivalent to: <code class="sourceCode cpp"><span class="cf">return</span> <span class="op">*</span>pred_;</code></p>
</blockquote>

</div>
<h2 id="us296-converting-constructor-for-split_viewouter_iterator-is-slightly-wrong"><span class="header-section-number">2.2</span> <a href="https://github.com/cplusplus/nbballot/issues/292">US296</a> Converting constructor for <code class="sourceCode cpp">split_view<span class="op">::</span>outer_iterator</code> is slightly wrong<a href="#us296-converting-constructor-for-split_viewouter_iterator-is-slightly-wrong" class="self-link"></a></h2>
<p><span class="draftnote" style="color: #01796F">[ Drafting note: LWG was not convinced that the constructor was wrong, but nonetheless agreed to change this for consistency with the rest of the Clause. ]</span></p>
<p>Edit <span>24.7.11.3 <a href="https://wg21.link/range.split.outer">[range.split.outer]</a></span>, class template <code class="sourceCode cpp">split_view<span class="op">::</span>outer_iterator</code> synopsis, as indicated:</p>
<blockquote>
<div>
<div class="sourceCode" id="cb3"><pre class="sourceCode diff"><code class="sourceCode diff"><span id="cb3-1"><a href="#cb3-1"></a> namespace std::ranges {</span>
<span id="cb3-2"><a href="#cb3-2"></a>   template&lt;class V, class Pattern&gt;</span>
<span id="cb3-3"><a href="#cb3-3"></a>   template&lt;bool Const&gt;</span>
<span id="cb3-4"><a href="#cb3-4"></a>   struct split_view&lt;V, Pattern&gt;::outer_iterator {</span>
<span id="cb3-5"><a href="#cb3-5"></a></span>
<span id="cb3-6"><a href="#cb3-6"></a>   <em>[…]</em></span>
<span id="cb3-7"><a href="#cb3-7"></a></span>
<span id="cb3-8"><a href="#cb3-8"></a>     outer_iterator() = default;</span>
<span id="cb3-9"><a href="#cb3-9"></a>     constexpr explicit outer_iterator(Parent&amp; parent)</span>
<span id="cb3-10"><a href="#cb3-10"></a>       requires (!forward_range&lt;Base&gt;);</span>
<span id="cb3-11"><a href="#cb3-11"></a>     constexpr outer_iterator(Parent&amp; parent, iterator_t&lt;Base&gt; current)</span>
<span id="cb3-12"><a href="#cb3-12"></a>       requires forward_range&lt;Base&gt;;</span>
<span id="cb3-13"><a href="#cb3-13"></a>     constexpr outer_iterator(outer_iterator&lt;!Const&gt; i)</span>
<span id="cb3-14"><a href="#cb3-14"></a><span class="st">-      requires Const &amp;&amp; convertible_to&lt;iterator_t&lt;V&gt;, iterator_t&lt;<span class="diffdel">const V</span>&gt;&gt;;</span></span>
<span id="cb3-15"><a href="#cb3-15"></a><span class="va">+      requires Const &amp;&amp; convertible_to&lt;iterator_t&lt;V&gt;, iterator_t&lt;<span class="diffins">Base</span>&gt;&gt;;</span></span>
<span id="cb3-16"><a href="#cb3-16"></a></span>
<span id="cb3-17"><a href="#cb3-17"></a>     constexpr value_type operator*() const;</span>
<span id="cb3-18"><a href="#cb3-18"></a></span>
<span id="cb3-19"><a href="#cb3-19"></a>     constexpr outer_iterator&amp; operator++();</span>
<span id="cb3-20"><a href="#cb3-20"></a>     constexpr decltype(auto) operator++(int) {</span>
<span id="cb3-21"><a href="#cb3-21"></a>       if constexpr (forward_range&lt;Base&gt;) {</span>
<span id="cb3-22"><a href="#cb3-22"></a>         auto tmp = *this;</span>
<span id="cb3-23"><a href="#cb3-23"></a>         ++*this;</span>
<span id="cb3-24"><a href="#cb3-24"></a>         return tmp;</span>
<span id="cb3-25"><a href="#cb3-25"></a>       } else</span>
<span id="cb3-26"><a href="#cb3-26"></a>         ++*this;</span>
<span id="cb3-27"><a href="#cb3-27"></a>     }</span>
<span id="cb3-28"><a href="#cb3-28"></a></span>
<span id="cb3-29"><a href="#cb3-29"></a>     friend constexpr bool operator==(const outer_iterator&amp; x, const outer_iterator&amp; y)</span>
<span id="cb3-30"><a href="#cb3-30"></a>       requires forward_range&lt;Base&gt;;</span>
<span id="cb3-31"><a href="#cb3-31"></a></span>
<span id="cb3-32"><a href="#cb3-32"></a>     friend constexpr bool operator==(const outer_iterator&amp; x, default_sentinel_t);</span>
<span id="cb3-33"><a href="#cb3-33"></a>   };</span>
<span id="cb3-34"><a href="#cb3-34"></a> }</span></code></pre></div>
</div>
</blockquote>
<p>Edit <span>24.7.11.3 <a href="https://wg21.link/range.split.outer">[range.split.outer]</a></span> before p4 as indicated:</p>
<blockquote>
<div>
<div class="sourceCode" id="cb4"><pre class="sourceCode diff"><code class="sourceCode diff"><span id="cb4-1"><a href="#cb4-1"></a> constexpr outer_iterator(outer_iterator&lt;!Const&gt; i)</span>
<span id="cb4-2"><a href="#cb4-2"></a><span class="st">-  requires Const &amp;&amp; convertible_to&lt;iterator_t&lt;V&gt;, iterator_t&lt;<span class="diffdel">const V</span>&gt;&gt;;</span></span>
<span id="cb4-3"><a href="#cb4-3"></a><span class="va">+  requires Const &amp;&amp; convertible_to&lt;iterator_t&lt;V&gt;, iterator_t&lt;<span class="diffins">Base</span>&gt;&gt;;</span></span></code></pre></div>
</div>
<p><span class="marginalizedparent"><a class="marginalized">4</a></span> <em>Effects:</em> Initializes <code class="sourceCode cpp">parent_</code>­ with <code class="sourceCode cpp">i<span class="op">.</span>parent_</code>­ and <code class="sourceCode cpp">current_</code>­ with <code class="sourceCode cpp">std​<span class="op">::</span>​move<span class="op">(</span>i<span class="op">.</span>current_­<span class="op">)</span></code>.</p>
</blockquote>
<h2 id="us292-incorrect-constructor-for-join_viewiterator"><span class="header-section-number">2.3</span> <a href="https://github.com/cplusplus/nbballot/issues/288">US292</a> Incorrect constructor for <code class="sourceCode cpp">join_view<span class="op">::</span>iterator</code><a href="#us292-incorrect-constructor-for-join_viewiterator" class="self-link"></a></h2>
<p>Edit <span>24.7.10.3 <a href="https://wg21.link/range.join.iterator">[range.join.iterator]</a></span>, class template <code class="sourceCode cpp">join_­view​<span class="op">::</span>​iterator</code> synopsis, as indicated:</p>
<blockquote>
<div>
<div class="sourceCode" id="cb5"><pre class="sourceCode diff"><code class="sourceCode diff"><span id="cb5-1"><a href="#cb5-1"></a> namespace std::ranges {</span>
<span id="cb5-2"><a href="#cb5-2"></a> template&lt;class V&gt;</span>
<span id="cb5-3"><a href="#cb5-3"></a>   template&lt;bool Const&gt;</span>
<span id="cb5-4"><a href="#cb5-4"></a>   struct join_view&lt;V&gt;::iterator {</span>
<span id="cb5-5"><a href="#cb5-5"></a></span>
<span id="cb5-6"><a href="#cb5-6"></a>   <em>[…]</em></span>
<span id="cb5-7"><a href="#cb5-7"></a></span>
<span id="cb5-8"><a href="#cb5-8"></a>     iterator() = default;</span>
<span id="cb5-9"><a href="#cb5-9"></a><span class="st">-    constexpr iterator(Parent&amp; parent, iterator_t&lt;<span class="diffdel">V</span>&gt; outer);</span></span>
<span id="cb5-10"><a href="#cb5-10"></a><span class="va">+    constexpr iterator(Parent&amp; parent, iterator_t&lt;<span class="diffins">Base</span>&gt; outer);</span></span>
<span id="cb5-11"><a href="#cb5-11"></a>     constexpr iterator(iterator&lt;!Const&gt; i)</span>
<span id="cb5-12"><a href="#cb5-12"></a>       requires Const &amp;&amp;</span>
<span id="cb5-13"><a href="#cb5-13"></a>                convertible_to&lt;iterator_t&lt;V&gt;, iterator_t&lt;Base&gt;&gt; &amp;&amp;</span>
<span id="cb5-14"><a href="#cb5-14"></a>                convertible_to&lt;iterator_t&lt;InnerRng&gt;,</span>
<span id="cb5-15"><a href="#cb5-15"></a>                               iterator_t&lt;range_reference_t&lt;Base&gt;&gt;&gt;;</span>
<span id="cb5-16"><a href="#cb5-16"></a></span>
<span id="cb5-17"><a href="#cb5-17"></a>   <em>[…]</em></span>
<span id="cb5-18"><a href="#cb5-18"></a></span>
<span id="cb5-19"><a href="#cb5-19"></a>   };</span>
<span id="cb5-20"><a href="#cb5-20"></a> }</span></code></pre></div>
</div>
</blockquote>
<p>Edit <span>24.7.10.3 <a href="https://wg21.link/range.join.iterator">[range.join.iterator]</a></span> before p7 as indicated:</p>
<blockquote>
<div>
<div class="sourceCode" id="cb6"><pre class="sourceCode diff"><code class="sourceCode diff"><span id="cb6-1"><a href="#cb6-1"></a><span class="st">-    constexpr iterator(Parent&amp; parent, iterator_t&lt;<span class="diffdel">V</span>&gt; outer)</span></span>
<span id="cb6-2"><a href="#cb6-2"></a><span class="va">+    constexpr iterator(Parent&amp; parent, iterator_t&lt;<span class="diffins">Base</span>&gt; outer)<span class="diffins">;</span></span></span></code></pre></div>
</div>
<p><span class="marginalizedparent"><a class="marginalized">7</a></span> <em>Effects</em>: Initializes <code class="sourceCode cpp">outer_­</code> with <code class="sourceCode cpp">outer</code> and <code class="sourceCode cpp">parent_­</code> with <code class="sourceCode cpp">addressof<span class="op">(</span>parent<span class="op">)</span></code>; then calls <code class="sourceCode cpp">satisfy<span class="op">()</span></code>.</p>
</blockquote>
<h2 id="us291-join_viewbegin-requires-mutable-data"><span class="header-section-number">2.4</span> <a href="https://github.com/cplusplus/nbballot/issues/287">US291</a> <code class="sourceCode cpp">join_view<span class="op">::</span>begin</code> requires mutable data<a href="#us291-join_viewbegin-requires-mutable-data" class="self-link"></a></h2>
<p>Edit <span>24.7.10.2 <a href="https://wg21.link/range.join.view">[range.join.view]</a></span> as indicated:</p>
<blockquote>
<div>
<div class="sourceCode" id="cb7"><pre class="sourceCode diff"><code class="sourceCode diff"><span id="cb7-1"><a href="#cb7-1"></a> namespace std::ranges {</span>
<span id="cb7-2"><a href="#cb7-2"></a>   template&lt;input_range V&gt;</span>
<span id="cb7-3"><a href="#cb7-3"></a>     requires view&lt;V&gt; &amp;&amp; input_range&lt;range_reference_t&lt;V&gt;&gt; &amp;&amp;</span>
<span id="cb7-4"><a href="#cb7-4"></a>              (is_reference_v&lt;range_reference_t&lt;V&gt;&gt; ||</span>
<span id="cb7-5"><a href="#cb7-5"></a>               view&lt;range_value_t&lt;V&gt;&gt;)</span>
<span id="cb7-6"><a href="#cb7-6"></a>   class join_view : public view_interface&lt;join_view&lt;V&gt;&gt; {</span>
<span id="cb7-7"><a href="#cb7-7"></a></span>
<span id="cb7-8"><a href="#cb7-8"></a>   <em>[…]</em></span>
<span id="cb7-9"><a href="#cb7-9"></a></span>
<span id="cb7-10"><a href="#cb7-10"></a>   public:</span>
<span id="cb7-11"><a href="#cb7-11"></a></span>
<span id="cb7-12"><a href="#cb7-12"></a>     <em>[…]</em></span>
<span id="cb7-13"><a href="#cb7-13"></a></span>
<span id="cb7-14"><a href="#cb7-14"></a>     constexpr auto begin() {</span>
<span id="cb7-15"><a href="#cb7-15"></a><span class="va">+      constexpr bool use_const = <em>simple-view</em>&lt;V&gt; &amp;&amp;</span></span>
<span id="cb7-16"><a href="#cb7-16"></a><span class="va">+        is_reference_v&lt;range_reference_t&lt;V&gt;&gt;;</span></span>
<span id="cb7-17"><a href="#cb7-17"></a><span class="st">-      return iterator&lt;<span class="diffdel"><em>simple-view</em>&lt;V&gt;</span>&gt;{*this, ranges::begin(base_)};</span></span>
<span id="cb7-18"><a href="#cb7-18"></a><span class="va">+      return iterator&lt;<span class="diffins">use_const</span>&gt;{*this, ranges::begin(base_)};</span></span>
<span id="cb7-19"><a href="#cb7-19"></a>     }</span>
<span id="cb7-20"><a href="#cb7-20"></a></span>
<span id="cb7-21"><a href="#cb7-21"></a>     <em>[…]</em></span>
<span id="cb7-22"><a href="#cb7-22"></a>  };</span>
<span id="cb7-23"><a href="#cb7-23"></a></span>
<span id="cb7-24"><a href="#cb7-24"></a>  template&lt;class R&gt;</span>
<span id="cb7-25"><a href="#cb7-25"></a>    explicit join_view(R&amp;&amp;) -&gt; join_view&lt;all_view&lt;R&gt;&gt;;</span>
<span id="cb7-26"><a href="#cb7-26"></a>}</span></code></pre></div>
</div>
</blockquote>
<h2 id="us283-specification-of-has-arrow-concept-is-ill-formed"><span class="header-section-number">2.5</span> <a href="https://github.com/cplusplus/nbballot/issues/279">US283</a> Specification of <em><code class="sourceCode cpp">has<span class="op">-</span>arrow</code></em> concept is ill-formed<a href="#us283-specification-of-has-arrow-concept-is-ill-formed" class="self-link"></a></h2>
<p>Edit <span>24.5.1 <a href="https://wg21.link/range.utility.helpers">[range.utility.helpers]</a></span> as indicated:</p>
<blockquote>
<div>
<div class="sourceCode" id="cb8"><pre class="sourceCode diff"><code class="sourceCode diff"><span id="cb8-1"><a href="#cb8-1"></a><span class="st">- template&lt;<span class="diffdel">input_iterator</span> I&gt;</span></span>
<span id="cb8-2"><a href="#cb8-2"></a><span class="va">+ template&lt;<span class="diffins">class</span> I&gt;</span></span>
<span id="cb8-3"><a href="#cb8-3"></a>    concept <em>has-arrow</em> =                           // <em>exposition only</em></span>
<span id="cb8-4"><a href="#cb8-4"></a><span class="st">-     is_pointer_v&lt;I&gt; || requires(I i) { i.operator-&gt;(); };</span></span>
<span id="cb8-5"><a href="#cb8-5"></a><span class="va">+     <span class="diffins">input_iterator&lt;I&gt; &amp;&amp; (</span>is_pointer_v&lt;I&gt; || requires(I i) { i.operator-&gt;(); }<span class="diffins">)</span>;</span></span></code></pre></div>
</div>
</blockquote>
<h1 id="references" style="border-bottom:1px solid #cccccc"><span class="header-section-number">3</span> References<a href="#references" class="self-link"></a></h1>

<div id="refs" role="doc-bibliography">
<div id="ref-N4835">
<p>[N4835] Richard Smith. 2019. Working Draft, Standard for Programming Language C++. <br />
<a href="https://wg21.link/n4835">https://wg21.link/n4835</a></p>
</div>
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