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<base href="https://llvm.org/bugs/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - User-declared destructor makes all the defaulted assignment operators non-constexpr defined"
href="https://llvm.org/bugs/show_bug.cgi?id=25692">25692</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>User-declared destructor makes all the defaulted assignment operators non-constexpr defined
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</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>-New Bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>tomilovanatoliy@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>In following code all defaulted assignment operators recognized as
non-constexpr:
struct S
{
S() = default;
S(S const &) = default;
S(S &&) = default;
S & operator = (S const &) = default;
S & operator = (S &&) = default;
~S() = default;
};
inline constexpr bool test()
{
S a;
S b;
a = b; // !
//a = std::move(b); // equally the same error
return true;
}
static_assert(test());
Code fails to compile at line marked by // !
An error message is:
/home/user/cpp/main.cpp:21:23: error: constexpr function never produces a
constant expression [-Winvalid-constexpr]
inline constexpr bool test()
^
/home/user/cpp/main.cpp:25:7: note: non-constexpr function 'operator=' cannot
be used in a constant expression
a = b;
^
/home/user/cpp/main.cpp:16:9: note: declared here
S & operator = (S &) = default;
^
/home/user/cpp/main.cpp:29:15: error: static_assert expression is not an
integral constant expression
static_assert(test());
^~~~~~
/home/user/cpp/main.cpp:25:7: note: non-constexpr function 'operator=' cannot
be used in a constant expression
a = b;
^
/home/user/cpp/main.cpp:29:15: note: in call to 'test()'
static_assert(test());
^
/home/user/cpp/main.cpp:16:9: note: declared here
S & operator = (S &) = default;
^
2 errors generated.
Commenting out destructor makes code to compile fine.</pre>
</div>
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