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    <p>Although there is no direct reference of it, I'd think that is most logical behavior of <code>std::codecvt::out</code>. Consider following scenario:</p> <ul> <li>You use <code>std::codecvt::out</code> in the same manner as you did - not translating any characters (possibly without knowing) into your <code>out_buf</code>.</li> <li>You now want to translate another string into your <code>out_buf</code> (again using <code>std::codecvt::out</code>) such that it appends the content which is already inside</li> <li>To do so, you decide to use your <code>buf_mid</code> as you know it points directly after your string that you translated in the first step.</li> <li>Now, if <code>std::codecvt::out</code> worked according to your expectations (<code>buf_mid</code> pointing to the character after first) then the first character of your <code>out_buf</code> would never be written which would not be exactly what you would want/expect in this case.</li> </ul> <p>In essence, <code>extern_type*&amp; to_next</code> (last parameter of <code>std::codecvt::out</code>) is here for you as a reference of where you left of - so you know where to continue - which is in your case indeed the same position as where you started (<code>extern_type* to</code>) parameter. </p> <ul> <li><p><a href="http://en.cppreference.com/w/cpp/locale/codecvt/out" rel="nofollow">cppreferece.com on std::codecvt::out</a></p></li> <li><p><a href="http://www.cplusplus.com/reference/locale/codecvt/out/" rel="nofollow">cpulusplus.com on std::codecvt::out</a></p></li> </ul>
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    1. POtrouble with std::codecvt_utf8 facet
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    1. COThere is also the `state` variable/parameter that should give the implementation some information regarding the conversion state. What you are describing above is IMHO something that should be take care of through state and calling [`codecvt::unshift()`](http://en.cppreference.com/w/cpp/locale/codecvt/unshift) (possibly in a loop again, if the output buffer is only one byte long) before calling `codecvt::out()` again on the to be appended string.
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    2. CO@wilx thats a very good point. Did Microsoft reply to your question yet? (I saw your question on their site)
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    3. COI have not received any reaction beside two automated messages, yet.
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