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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Clang rejects deleted defaulted noexcept default constructor"
href="https://bugs.llvm.org/show_bug.cgi?id=33550">33550</a>
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<th>Summary</th>
<td>Clang rejects deleted defaulted noexcept default constructor
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>C++
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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</tr>
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<th>Reporter</th>
<td>billy.oneal@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>dgregor@apple.com, llvm-bugs@lists.llvm.org
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<p>
<div>
<pre>Consider the following:
template<class _Ty>
struct atomic {
constexpr atomic(_Ty _Val) throw() // TRANSITION, VSO#174686
: _My_val(_Val)
{ // construct from _Val, initialization is not an atomic
operation
}
atomic() _NOEXCEPT = default;
atomic(const atomic&) = delete;
atomic& operator=(const atomic&) = delete;
atomic& operator=(const atomic&) volatile = delete;
_Ty _My_val;
};
struct non_default_ctor_able {
non_default_ctor_able() = delete;
explicit non_default_ctor_able(int) {}
non_default_ctor_able(const non_default_ctor_able&) = default;
non_default_ctor_able& operator=(const non_default_ctor_able&) = default;
~non_default_ctor_able() = default;
};
int main() {
atomic<non_default_ctor_able> atm{non_default_ctor_able{42}};
(void)atm;
};
C1XX, EDG, and GCC are all happy with this. Clang rejects (
<a href="https://wandbox.org/permlink/b40YJn7QwRprgdTp">https://wandbox.org/permlink/b40YJn7QwRprgdTp</a> ) , saying:
prog.cc:9:2: error: exception specification of explicitly defaulted default
constructor does not match the calculated one
atomic() noexcept = default;
^
prog.cc:26:35: note: in instantiation of template class
'atomic<non_default_ctor_able>' requested here
atomic<non_default_ctor_able> atm{non_default_ctor_able{42}};
^
1 error generated.</pre>
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