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<table class="t-dcl-begin"><tbody>
<tr class="t-dcl">
<td class="t-dcl-nopad"> <div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1"><</span> <span class="kw1">class</span> ForwardIt <span class="sy1">></span><br />
string_type transform_primary<span class="br0">(</span> ForwardIt first, ForwardIt last <span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div></td>
<td class="t-dcl-nopad"> </td>
<td class="t-dcl-nopad"> </td>
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<tr class="t-dcl-sep"><td></td><td></td><td></td></tr>
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<p>For the character sequence <code>[first, last)</code>, obtains the primary sort key in the imbued locale's collating order, that is, the sort key that is based on the positions of the letters and collation units in the national alphabet, ignoring case, diacritics, variants, etc. If a primary sort key compares less than another primary sort key with <span class="t-c"><span class="mw-geshi cpp source-cpp">operator<span class="sy1"><</span></span></span>, then the character sequence that produced the first sort key comes before the character sequence that produced the second sort key, in the currently imbued locale's primary collation order.
</p><p>The regex library uses this trait to match characters against equivalence classes. For example, the regex <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="br0">[</span><span class="br0">[</span><span class="sy1">=</span>a<span class="sy1">=</span><span class="br0">]</span><span class="br0">]</span></span></span> is equivalent to the character <code>c1</code> if <span class="t-c"><span class="mw-geshi cpp source-cpp">traits.<span class="me1">transform_primary</span><span class="br0">(</span>c1<span class="br0">)</span></span></span> is equivalent to <span class="t-c"><span class="mw-geshi cpp source-cpp">traits.<span class="me1">transform_primary</span><span class="br0">(</span><span class="st0">"a"</span><span class="br0">)</span></span></span> (which is true for any <code>c1</code> from <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="st0">"AÀÁÂÃÄÅaàáâãäå"</span></span></span> in the U.S. English locale). Note that <code>transform_primary()</code> takes a character sequence argument because equivalence classes may be multicharacter, such as <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="br0">[</span><span class="br0">[</span><span class="sy1">=</span>ch<span class="sy1">=</span><span class="br0">]</span><span class="br0">]</span></span></span> in Czech or <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="br0">[</span><span class="br0">[</span><span class="sy1">=</span>dzs<span class="sy1">=</span><span class="br0">]</span><span class="br0">]</span></span></span> in Hungarian.
</p><p>There is no portable way to define primary sort key in terms of <span class="t-lc"><a href="../../locale/locale.html" title="cpp/locale/locale">std::locale</a></span> since the conversion from the collation key returned by <span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">collate</span><span class="sy4">::</span><span class="me2">transform</span><span class="br0">(</span><span class="br0">)</span></span></span> to the primary equivalence key is locale-specific, and if the user replaces the <span class="t-lc"><a href="../../locale/collate.html" title="cpp/locale/collate">std::collate</a></span> facet, that conversion is no longer known to the standard library's <span class="t-lc"><a href="../regex_traits.html" title="cpp/regex/regex traits">std::regex_traits</a></span>. Standard library specializations of <span class="t-lc"><a href="../regex_traits.html" title="cpp/regex/regex traits">std::regex_traits</a></span> return an empty string unless the <span class="t-lc"><a href="../../locale/collate.html" title="cpp/locale/collate">std::collate</a></span> facet of the currently-imbued locale was not replaced by the user, and still matches the system-supplied <span class="t-lc"><a href="../../locale/collate.html" title="cpp/locale/collate">std::collate</a></span> facet), in which case <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../../locale/collate_byname.html"><span class="kw1673">std::<span class="me2">collate_byname</span></span></a><span class="sy1"><</span>charT<span class="sy1">></span><span class="sy4">::</span><span class="me2">transform</span><span class="br0">(</span>first, last<span class="br0">)</span></span></span> is executed and the sort key it produces is converted to the expected primary sort key using a locale-specific conversion.
</p>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=cpp/regex/regex_traits/transform_primary&action=edit&section=1" title="Edit section: Parameters">edit</a>]</span> <span class="mw-headline" id="Parameters">Parameters</span></h3>
<table class="t-par-begin">
<tr class="t-par">
<td> first, last
</td>
<td> -
</td>
<td> a pair of iterators which determines the sequence of characters to compare
</td></tr>
<tr class="t-par-hitem">
<td colspan="3"> Type requirements
</td></tr>
<tr class="t-par-req">
<td colspan="3"> -<div class="spacer"></div><code>ForwardIt</code> must meet the requirements of <a href="../../concept/ForwardIterator.html" title="cpp/concept/ForwardIterator"><code>ForwardIterator</code></a>.
</td></tr></table>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=cpp/regex/regex_traits/transform_primary&action=edit&section=2" title="Edit section: Return value">edit</a>]</span> <span class="mw-headline" id="Return_value">Return value</span></h3>
<p>The primary sort key for the character sequence <code>[first, last)</code> in the currently imbued locale, ignoring case, variant, diacritics, etc.
</p>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=cpp/regex/regex_traits/transform_primary&action=edit&section=3" title="Edit section: Example">edit</a>]</span> <span class="mw-headline" id="Example">Example</span></h3>
<div class="t-example"><p> Demonstrates the regex feature that works through transform_primary()
</p><div class="t-example-live-link"><div class="coliru-btn coliru-btn-run-init">Run this code</div></div>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="cpp source-cpp"><pre class="de1"><span class="co2">#include <iostream></span>
<span class="co2">#include <regex></span>
 
<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
<span class="br0">{</span>
std<span class="sy4">::</span><span class="me2">locale</span><span class="sy4">::</span><span class="me2">global</span><span class="br0">(</span><a href="../../locale/locale.html"><span class="kw1589">std::<span class="me2">locale</span></span></a><span class="br0">(</span><span class="st0">"en_US.UTF-8"</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
<a href="../../string/basic_string.html"><span class="kw1051">std::<span class="me2">wstring</span></span></a> str <span class="sy1">=</span> L<span class="st0">"AÀÁÂÃÄÅaàáâãäå"</span><span class="sy4">;</span>
<a href="../basic_regex.html"><span class="kw1696">std::<span class="me2">wregex</span></span></a> re<span class="br0">(</span>L<span class="st0">"[[=a=]]*"</span>, std<span class="sy4">::</span><span class="me2">regex</span><span class="sy4">::</span><span class="me2">basic</span><span class="br0">)</span><span class="sy4">;</span>
<a href="../../io/cout.html"><span class="kw1453">std::<span class="me2">cout</span></span></a> <span class="sy1"><<</span> <a href="../../io/manip/boolalpha.html"><span class="kw1459">std::<span class="me2">boolalpha</span></span></a> <span class="sy1"><<</span> <a href="../regex_match.html"><span class="kw1707">std::<span class="me2">regex_match</span></span></a><span class="br0">(</span>str, re<span class="br0">)</span> <span class="sy1"><<</span> <span class="st0">'<span class="es1">\n</span>'</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div></div>
<p>Output:
</p>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="text source-text"><pre class="de1">true</pre></div></div>
</div>
<table class="metadata plainlinks ambox mbox-small-left ambox-notice" style=""><tr><td class="mbox-empty-cell"></td><td class="mbox-text" style="">This section is incomplete<br />Reason: could use an example with user-defined regex_traits supplying user-defined transform_primary </td></tr></table>
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