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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 - decltype of template parameter object is not const"
href="https://bugs.llvm.org/show_bug.cgi?id=49609">bug 49609</a>
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<tr>
<th>What</th>
<th>Removed</th>
<th>Added</th>
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<td style="text-align:right;">Status</td>
<td>NEW
</td>
<td>RESOLVED
</td>
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<tr>
<td style="text-align:right;">Resolution</td>
<td>---
</td>
<td>INVALID
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<b><a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - decltype of template parameter object is not const"
href="https://bugs.llvm.org/show_bug.cgi?id=49609#c1">Comment # 1</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - decltype of template parameter object is not const"
href="https://bugs.llvm.org/show_bug.cgi?id=49609">bug 49609</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>Clang's behavior is correct. `decltype(V)`, where `V` is an id-expression,
produces the type of the entity denoted by `V`, not the type of the expression.
See [dcl.type.decltype]/1.2:
"if E is an unparenthesized id-expression naming a non-type template-parameter
(13.2), decltype(E) is the type of the template-parameter after performing any
necessary type deduction (9.2.9.6, 9.2.9.7);"
Per [temp.param](13.2)/6, the type of the template parameter is not
const-qualified, even though (per (13.2)/8) the type of the template parameter
object is.
So decltype(V) in this case is 'A', but decltype((V)) is 'const A&'.</pre>
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