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<base href="https://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - union conatining non-trivially-copyable member is trivially-copyable itself"
href="https://llvm.org/bugs/show_bug.cgi?id=25691">25691</a>
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<th>Summary</th>
<td>union conatining non-trivially-copyable member is trivially-copyable itself
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Windows NT
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>-New Bugs
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>tomilovanatoliy@gmail.com
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</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
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<th>Classification</th>
<td>Unclassified
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<p>
<div>
<pre>Struct S recognized by type trait as non-trivially-non-const-copy-assignable,
but union
struct S
{
constexpr S() = default;
constexpr S(S const &) = default;
constexpr S(S &) = default;
constexpr S(S &&) = default;
S & operator = (S const &) = default;
S & operator = (S &) = default;
S & operator = (S &&) = default;
};
static_assert(!std::is_trivially_assignable< S &, S & >{}, "!");
union U { S s; };
static_assert(std::is_trivially_assignable< U &, U & >{}, "!");
I use libc++ from trunk and std::is_trivially_assignable uses
`__is_trivially_assignable()` built-in type trait in turn.</pre>
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