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<title>Issue 2649: [filesys.ts] [PDTS] path and directory_entry move ctors should not be noexcept</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#TS">TS</a> status.</em></p>
<h3 id="2649"><a href="lwg-defects.html#2649">2649</a>. [filesys.ts] [PDTS] <code>path</code> and <code>directory_entry</code> move ctors should not be <code>noexcept</code></h3>
<p><b>Section:</b> 8.4.1 [filesys.ts::path.construct], 12 [filesys.ts::class.directory_entry] <b>Status:</b> <a href="lwg-active.html#TS">TS</a>
 <b>Submitter:</b> Stephan T. Lavavej <b>Opened:</b> 2014-02-03 <b>Last modified:</b> 2017-07-30</p>
<p><b>Priority: </b>Not Prioritized
</p>
<p><b>View all other</b> <a href="lwg-index.html#filesys.ts::path.construct">issues</a> in [filesys.ts::path.construct].</p>
<p><b>View all issues with</b> <a href="lwg-status.html#TS">TS</a> status.</p>
<p><b>Discussion:</b></p>
<p><b>Addresses: filesys.ts</b></p>
<p>
<code>path</code>'s move ctor is marked <code>noexcept</code>, but it contains a <code>basic_string</code>.
Similarly, <code>directory_entry</code>'s move ctor is marked <code>noexcept</code>, but it contains a <code>path</code>.
This is affected by LWG 2319 "<code>basic_string</code>'s move constructor should not be <code>noexcept</code>".
</p>

<p><i>[Beman Dawes 2014-02-27]</i></p>


  <p/>Issues <a href="lwg-defects.html#2637" title="[filesys.ts] [PDTS] All functions with error_code arguments should be noexcept (Status: TS)">2637</a><sup><a href="https://cplusplus.github.io/LWG/issue2637" title="Latest snapshot">(i)</a></sup>,
  <a href="lwg-closed.html#2638" title="[filesys.ts] [PDTS] Make certain functions noexcept and drop error_code version (Status: NAD)">2638</a><sup><a href="https://cplusplus.github.io/LWG/issue2638" title="Latest snapshot">(i)</a></sup>,
  <a href="lwg-defects.html#2641" title="[filesys.ts] [PDTS] directory_iterator, recursive_directory_iterator, move construct/assign should be noexcept (Status: TS)">2641</a><sup><a href="https://cplusplus.github.io/LWG/issue2641" title="Latest snapshot">(i)</a></sup>,
  and <a href="lwg-defects.html#2649" title="[filesys.ts] [PDTS] path and directory_entry move ctors should not be noexcept (Status: TS)">2649</a><sup><a href="https://cplusplus.github.io/LWG/issue2649" title="Latest snapshot">(i)</a></sup> are concerned with signatures which should or should not
  be <code>noexcept</code>. I will provide unified proposed wording for these issues, possibly in a separate paper.
  
  <p><i>[21 May 2014 Beman Dawes provides wording.
See <a href="lwg-closed.html#2319" title="basic_string's move constructor should not be noexcept (Status: NAD)">2319</a><sup><a href="https://cplusplus.github.io/LWG/issue2319" title="Latest snapshot">(i)</a></sup> for rationale.
]</i></p>


  <p><i>[19 Jun 2014 LWG revises P/R to stay consistent with LWG issues.]</i></p>




<p id="res-2649"><b>Proposed resolution:</b></p>
  <i>Change 8 Class path [class.path]:</i>
  <blockquote>
    <pre>path() <ins>noexcept</ins>;</pre>
  </blockquote>

  <i>Change 8.4.1 path constructors [path.construct]:</i>
  <blockquote>
    <pre>path() <ins>noexcept</ins>;</pre>
  </blockquote>

  <i>Change 12 Class directory_entry [class.directory_entry]:</i>
  <blockquote>
    <pre>directory_entry() <ins>noexcept</ins> = default;</pre>
  </blockquote>






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