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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - incorrect result for is_trivially_copyable on class with deleted destructor"
href="http://llvm.org/bugs/show_bug.cgi?id=21010">21010</a>
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<th>Summary</th>
<td>incorrect result for is_trivially_copyable on class with deleted destructor
</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>Linux
</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
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<th>Component</th>
<td>C++11
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>mizvekov@gmail.com
</td>
</tr>
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<th>CC</th>
<td>dgregor@apple.com, llvmbugs@cs.uiuc.edu
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<th>Classification</th>
<td>Unclassified
</td>
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<p>
<div>
<pre>The following example results in is_trivially_copyable being true while it
should be false:
#include <iostream>
#include <type_traits>
struct foo {
int bar;
~foo() = delete;
};
int main() {
std::cout << std::is_trivially_copyable<foo>::value << std::endl;
return 0;
}
The problem is that clang checks if the class has no non-trivial destructors,
instead of checking if it has a trivial destructor, an important distinction.
Consider how trivially copyable is defined in the draft standard:
A trivially copyable class is a class that:
— has no non-trivial copy constructors (12.8),
— has no non-trivial move constructors (12.8),
— has no non-trivial copy assignment operators (13.5.3, 12.8),
— has no non-trivial move assignment operators (13.5.3, 12.8), and
— has a trivial destructor (12.4).
Note the last bullet point. So clearly 'foo' should not be trivially copyable,
because it has no trivial destructor, since it was deleted.</pre>
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