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<title>Issue 2222: Inconsistency in description of forward_list::splice_after single-element overload</title>
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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#C++14">C++14</a> status.</em></p>
<h3 id="2222"><a href="lwg-defects.html#2222">2222</a>. Inconsistency in description of <code>forward_list::splice_after</code> single-element overload</h3>
<p><b>Section:</b> 23.3.7.6 <a href="https://wg21.link/forward.list.ops">[forward.list.ops]</a> <b>Status:</b> <a href="lwg-active.html#C++14">C++14</a>
 <b>Submitter:</b> Edward Catmur <b>Opened:</b> 2012-12-11 <b>Last modified:</b> 2023-02-07</p>
<p><b>Priority: </b>Not Prioritized
</p>
<p><b>View all other</b> <a href="lwg-index.html#forward.list.ops">issues</a> in [forward.list.ops].</p>
<p><b>View all issues with</b> <a href="lwg-status.html#C++14">C++14</a> status.</p>
<p><b>Discussion:</b></p>

<p>
 [forwardlist.ops] p6 has
</p>
<blockquote><pre>
void splice_after(const_iterator position, forward_list&amp; x, const_iterator i);
void splice_after(const_iterator position, forward_list&amp;&amp; x, const_iterator i);
</pre><p>
<i>Effects</i>: Inserts the element following <code>i</code> into <code>*this</code>, following <code>position</code>, 
and removes it from <code>x</code>. The result is unchanged if <code>position == i</code> or <code>position == ++i</code>. 
Pointers and references to <code>*i</code> continue to refer to the same element but as a member of <code>*this</code>. 
Iterators to <code>*i</code> (including <code>i</code> itself) continue to refer to the same element, but now behave 
as iterators into <code>*this</code>, not into <code>x</code>.
</p>
</blockquote>
<p>
This overload splices the element <em>following</em> <code>i</code> from <code>x</code> to <code>*this</code>, so the 
language in the two latter sentences should refer to <code>++i</code>:
</p>
<blockquote><p>
Pointers and references to <code>*++i</code> continue to refer to the same element but as a member of
<code>*this</code>. Iterators to <code>*++i</code> continue to refer to the same element, but now behave as iterators
into <code>*this</code>, not into <code>x</code>.
</p></blockquote>
<p>
</p>

<p><i>[2013-03-15 Issues Teleconference]</i></p>

<p>
Moved to Tentatively Ready.
</p>

<p><i>[2013-04-20 Bristol]</i></p>




<p id="res-2222"><b>Proposed resolution:</b></p>
<p>This wording is relative to N3485.</p>

<ol>
<li><p>Edit  [forwardlist.ops] p6 as indicated:</p>
<blockquote><pre>
void splice_after(const_iterator position, forward_list&amp; x, const_iterator i);
void splice_after(const_iterator position, forward_list&amp;&amp; x, const_iterator i);
</pre>
<p>
-5- <i>Requires</i>: <code>position</code> is <code>before_begin()</code> or is a dereferenceable iterator 
in the range <code>[begin(),end())</code>. The iterator following <code>i</code> is a dereferenceable iterator 
in <code>x</code>. <code>get_allocator() == x.get_allocator()</code>.
<p/>
-6- <i>Effects</i>: Inserts the element following <code>i</code> into <code>*this</code>, following <code>position</code>, 
and removes it from <code>x</code>. The result is unchanged if <code>position == i</code> or <code>position == ++i</code>. 
Pointers and references to <code>*<ins>++</ins>i</code> continue to refer to the same element but as a member of 
<code>*this</code>. Iterators to <code>*<ins>++</ins>i</code> <del>(including <code>i</code> itself)</del> continue to
refer to the same element, but now behave as iterators into <code>*this</code>, not into <code>x</code>.
</p></blockquote>
</li>
</ol>






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