<html>
<head>
<base href="https://llvm.org/bugs/" />
</head>
<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - optional<const T> not working"
href="https://llvm.org/bugs/show_bug.cgi?id=30260">30260</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>optional<const T> not working
</td>
</tr>
<tr>
<th>Product</th>
<td>libc++
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Hardware</th>
<td>All
</td>
</tr>
<tr>
<th>OS</th>
<td>All
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>All Bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>howard.hinnant@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org, mclow.lists@gmail.com
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>I expect this to compile and work:
#include <experimental/optional>
struct Foo {};
std::experimental::optional<const Foo>
someFunc();
int
main()
{
std::experimental::optional<const Foo> j;
j.emplace(*someFunc());
}
Instead I get compile-time errors such as:
In file included from test.cpp:22:
../libcxx/include/experimental/optional:274:17: error: no matching function for
call to 'operator new'
::new(_VSTD::addressof(__val_))
value_type(_VSTD::move(__x.__val_));
^~
I believe all that is needed (untested suggestion) is a const_cast of the
result of addressof on the way to new (several places).</pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are on the CC list for the bug.</li>
</ul>
</body>
</html>