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<body><span class="vcard"><a class="email" href="mailto:richard-llvm@metafoo.co.uk" title="Richard Smith <richard-llvm@metafoo.co.uk>"> <span class="fn">Richard Smith</span></a>
</span> changed
<a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - is_trivial not always equal to is_trivially_default_constructible && is_trivially_copyable"
href="https://bugs.llvm.org/show_bug.cgi?id=51054">bug 51054</a>
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<tr>
<th>What</th>
<th>Removed</th>
<th>Added</th>
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<td style="text-align:right;">Resolution</td>
<td>---
</td>
<td>INVALID
</td>
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<td style="text-align:right;">Status</td>
<td>NEW
</td>
<td>RESOLVED
</td>
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<b><a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - is_trivial not always equal to is_trivially_default_constructible && is_trivially_copyable"
href="https://bugs.llvm.org/show_bug.cgi?id=51054#c1">Comment # 1</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - is_trivial not always equal to is_trivially_default_constructible && is_trivially_copyable"
href="https://bugs.llvm.org/show_bug.cgi?id=51054">bug 51054</a>
from <span class="vcard"><a class="email" href="mailto:richard-llvm@metafoo.co.uk" title="Richard Smith <richard-llvm@metafoo.co.uk>"> <span class="fn">Richard Smith</span></a>
</span></b>
<pre>Recent Clang appears to be correct; old Clang and GCC appear to be incorrect.
For a class to be trivial, it must be trivially copyable, and all of its
(eligible) default constructors must be trivial.
In the case of S<int>, there are two default constructors:
* the defaulted S::S(), which is trivial
* the user-provided constexpr S::S(Args...), which is not trivial
So S<int> is not trivial.
However, S<int> *is* trivially default constructible, because overload
resolution for the expression S<int>() selects a trivial default constructor.
(The notion of a "trivial class" is somewhat useless, for largely this reason
-- you usually care about what overload resolution would select, not about what
constructors the class happens to declare.)</pre>
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