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<title>Issue 2883: The standard library should provide string_view parameters instead or in addition for functions 
      defined with char const * or string const &amp; as parameter types.</title>
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      defined with char const * or string const &amp; as parameter types.">
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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#LEWG">LEWG</a> status.</em></p>
<h3 id="2883"><a href="lwg-active.html#2883">2883</a>. The standard library should provide <code>string_view</code> parameters instead or in addition for functions 
      defined with <code>char const *</code> or <code>string const &amp;</code> as parameter types.</h3>
<p><b>Section:</b> 27.3 <a href="https://wg21.link/string.view">[string.view]</a> <b>Status:</b> <a href="lwg-active.html#LEWG">LEWG</a>
 <b>Submitter:</b> Switzerland <b>Opened:</b> 2017-02-03 <b>Last modified:</b> 2017-07-15</p>
<p><b>Priority: </b>Not Prioritized
</p>
<p><b>View other</b> <a href="lwg-index-open.html#string.view">active issues</a> in [string.view].</p>
<p><b>View all other</b> <a href="lwg-index.html#string.view">issues</a> in [string.view].</p>
<p><b>View all issues with</b> <a href="lwg-status.html#LEWG">LEWG</a> status.</p>
<p><b>Discussion:</b></p>
<b>Addresses CH 9</b>

<p>
The standard library should provide <code>string_view</code> parameters instead or in addition for functions defined with 
<code>char const *</code> or <code>string const &amp;</code> as parameter types. Most notably in cases where both such 
overloads exist or where an internal copy is expected anyway.
</p>
<p>
It might be doubted that the non-null termination of <code>string_view</code> could be an issue with functions that pass 
the <code>char *</code> down to OS functions, such as <code>fstream_buf::open()</code> etc. and those shouldn't provide it 
and favour generating a <code>std::string</code> temporary instead in that case. However, <code>std::path</code> demonstrates 
it is usable to have <code>string_view</code> overloads and there might be many places where it can be handy, or even better.
</p>

<p>Proposed change: Provide the overloads for <code>std::regex</code>, the exception classes, <code>std::bitset</code>, 
<code>std::locale</code> and more.</p>

<p><i>[Post-Kona 2017]</i></p>

<p>Most (all?) of these changes were proposed in <a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0506r0.pdf">P0506r1</a>, which was discussed by LEWG in Kona.</p>

<p><i>[2017-07 Toronto Thurs Issue Prioritization]</i></p>

<p>Status LEWG - they're already looking at this.</p>


<p id="res-2883"><b>Proposed resolution:</b></p>
<p>
</p>





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