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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - llvm::Optional doesn't work well with move-only types"
href="https://bugs.llvm.org/show_bug.cgi?id=51348">51348</a>
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<th>Summary</th>
<td>llvm::Optional doesn't work well with move-only types
</td>
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<th>Product</th>
<td>libraries
</td>
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<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Support Libraries
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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</tr>
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<th>Reporter</th>
<td>lemo1234@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
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<pre>`llvm::Optional<T>` doesn't work well when T is a move-only type.
Repro: <a href="https://godbolt.org/z/adPEfaaEa">https://godbolt.org/z/adPEfaaEa</a>
#include <llvm/ADT/Optional.h>
#include <vector>
#include <optional>
int main() {
using X = std::unique_ptr<int>;
using Y = llvm::Optional<X>; // fails to compile
//using Y = std::optional<X>; // compiles fine
std::vector<Y> z;
z.push_back(std::make_unique<int>(42));
}
The problem seems to be traced to the following?
std::_Construct(std::__addressof(*__cur), *__first);</pre>
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