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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 - __has_trivial_constructor is true for lambdas"
href="http://llvm.org/bugs/show_bug.cgi?id=21787">bug 21787</a>
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<th>What</th>
<th>Removed</th>
<th>Added</th>
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<td style="text-align:right;">Status</td>
<td>NEW
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<td>RESOLVED
</td>
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<td style="text-align:right;">CC</td>
<td>
</td>
<td>richard-llvm@metafoo.co.uk
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<td style="text-align:right;">Resolution</td>
<td>---
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<td>INVALID
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<b><a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - __has_trivial_constructor is true for lambdas"
href="http://llvm.org/bugs/show_bug.cgi?id=21787#c1">Comment # 1</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - __has_trivial_constructor is true for lambdas"
href="http://llvm.org/bugs/show_bug.cgi?id=21787">bug 21787</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>You shouldn't be calling __has_trivial_constructor; it's an implementation
detail for use by the standard library. And even then, it should not be used
because it's mostly meaningless; __is_trivially_constructible should be used
instead.
Also, just because the default constructor is deleted, that doesn't make it
non-trivial. Note that both GCC and Clang accept this:
struct S { S() = delete; };
static_assert(__has_trivial_constructor(S), "");
Since GCC rejects the corresponding case with a lambda, for which the default
constructor is supposed to be defined as in the above example, this seems to be
a GCC bug.</pre>
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