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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 - Explicit template instantiation can't be combined with specialization"
href="https://bugs.llvm.org/show_bug.cgi?id=39215">bug 39215</a>
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<th>What</th>
<th>Removed</th>
<th>Added</th>
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<td style="text-align:right;">Resolution</td>
<td>---
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<td>INVALID
</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;">Status</td>
<td>NEW
</td>
<td>RESOLVED
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<b><a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - Explicit template instantiation can't be combined with specialization"
href="https://bugs.llvm.org/show_bug.cgi?id=39215#c1">Comment # 1</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - Explicit template instantiation can't be combined with specialization"
href="https://bugs.llvm.org/show_bug.cgi?id=39215">bug 39215</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>[temp.spec] (12.8)/5 says:
"For a given template and a given set of template-arguments,
— an explicit instantiation definition shall appear at most once in a program,
— an explicit specialization shall be defined at most once in a program, as
specified in 6.2, and
— both an explicit instantiation and a declaration of an explicit
specialization shall not appear in a program unless the explicit instantiation
follows a declaration of the explicit specialization.
An implementation is not required to diagnose a violation of this rule."
In your case, the explicit instantiation did not follow a declaration of the
explicit specialization, so the program is ill-formed.
(Note that the standard permits an implementation to not diagnose this
ill-formed code, so the fact that GCC and ICC accept this doesn't make them
non-conforming.)</pre>
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