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<title>Issue 2003: String exception inconsistency in erase.</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="2003"><a href="lwg-defects.html#2003">2003</a>. String exception inconsistency in erase.</h3>
<p><b>Section:</b> 27.4.3.2 <a href="https://wg21.link/string.require">[string.require]</a> <b>Status:</b> <a href="lwg-active.html#C++14">C++14</a>
 <b>Submitter:</b> Jos&eacute; Daniel Garc&iacute;a S&aacute;nchez <b>Opened:</b> 2010-10-21 <b>Last modified:</b> 2016-11-12</p>
<p><b>Priority: </b>0
</p>
<p><b>View all other</b> <a href="lwg-index.html#string.require">issues</a> in [string.require].</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>
Clause 21.4.1 [string.require]p3 states:
</p>
<blockquote><p>
No <code>erase()</code> or <code>pop_back()</code> member function shall throw
any exceptions.
</p></blockquote>
<p>
However in 21.4.6.5 [string.erase] p2 the first version of <code>erase</code> has
</p>
<blockquote><p>
<i>Throws</i>: <code>out_of_range</code> if <code>pos > size()</code>.
</p></blockquote>

<p><i>[2011-03-24 Madrid meeting]</i></p>


<p>
Beman: Don't want to just change this, can we just say "unless otherwise specified"?
<p/>
Alisdair: Leave open, but update proposed resolution to say something like "unless otherwise specified".
<p/>
General agreement that it should be corrected but not a stop-ship.
<p/>
Action: Update proposed wording for issue 2003 as above, but leave Open. 
</p>

<p><i>[2014-02-12 Issaquah meeting]</i></p>


<p>
Jeffrey: Madrid meeting's proposed wording wasn't applied, and it's better than the original proposed wording.
However, this sentence is only doing 3 functions' worth of work, unlike the similar paragraphs in 23.2.2 <a href="https://wg21.link/container.requirements.general">[container.requirements.general]</a>.
Suggest just putting "<i>Throws:</i> Nothing" on the 3 functions.
</p>

<p><i>[2014-02-13 Issaquah meeting]</i></p>

<p>
Move as Immmediate
</p>



<p id="res-2003"><b>Proposed resolution:</b></p>
<p>
Remove [string.require]p/3:
</p>
<blockquote><p>
<del>3 No <code>erase()</code> or <code>pop_back()</code> member function shall throw any exceptions.</del>
</p></blockquote>

<p>
Add to the specifications of <code>iterator erase(const_iterator p);</code>, <code>iterator erase(const_iterator first, const_iterator last);</code>,
 and <code>void pop_back();</code> in 27.4.3.7.5 <a href="https://wg21.link/string.erase">[string.erase]</a>:
</p>
<blockquote><p><ins><i>Throws:</i> Nothing</ins></p></blockquote>





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