<p></p>
<p dir="auto"><a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/tomhughes/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://github.com/tomhughes">@tomhughes</a> <a href="https://github.com/openstreetmap/openstreetmap-website/issues/2025#issuecomment-1252881853" data-hovercard-type="issue" data-hovercard-url="/openstreetmap/openstreetmap-website/issues/2025/hovercard">said:</a></p>
<blockquote>
<p dir="auto">I mean probably it works fine given the setlocale I've just always steered clear of them myself.</p>
<p dir="auto">If it works as intended then it's counting codepoints though (which is good) not UTF16 values.</p>
</blockquote>
<p dir="auto"><code class="notranslate">setlocale</code> doesn't save you in this case, because <code class="notranslate">std:mbsrtowcs</code> behaviour depends on both the locale and the size of <code class="notranslate">wchar_t</code>. I think it is standardized in C++11 but implementation-defined before then. Outside C++11, <code class="notranslate">wchar_t</code> may be a UTF-16 code unit, whereas in C++11 I believe it will be a Unicode Scalar Value in a 4-byte native endian integer.</p>

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