<html><head><meta http-equiv="Content-Type" content="text/html; charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" dir="auto" class="">Hello!<div class=""><br class=""></div><div class="">I'm implementing a specialization for std::optional for my program-defined type. As I understand <font color="#0069d9" class=""><u class="">[namespace.std]</u></font>, nothing forbids me from doing that.</div><div class="">However, libcxx optional's converting copy constructor <a href="https://github.com/llvm-mirror/libcxx/blob/master/include/optional#L332" class="">uses __get()</a> on on the optional that's being copied. Since my specialization doesn't provide __get(), I cannot use this copy constructor to convert from the specialization.</div><div class=""><br class=""></div><div class="">So, is this is a bug or am I just not supposed to do what I'm trying to do? Is it worth replacing usages of __get() with dereferencing operator?</div></div><br class=""><div class="">
<div style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; text-decoration: none;">Kind regards, Vladimir Goncharov</div>
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