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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 - Unsafe perfect forwarding"
href="http://llvm.org/bugs/show_bug.cgi?id=20174">bug 20174</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
</td>
<td>RESOLVED
</td>
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<td style="text-align:right;">CC</td>
<td>
</td>
<td>richard-llvm@metafoo.co.uk
</td>
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<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 - Unsafe perfect forwarding"
href="http://llvm.org/bugs/show_bug.cgi?id=20174#c2">Comment # 2</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - Unsafe perfect forwarding"
href="http://llvm.org/bugs/show_bug.cgi?id=20174">bug 20174</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>It looks like Clang is behaving correctly here?
This:
d.out(12, 'a');
considers the following functions:
1) int derived::out(int s, word w)
[word = std::tuple_element<0, std::tuple<char, char>>]
2) auto decorator<Aut>::out(Args&&... args) -> decltype(a_.out(args...))
[Aut = base<std::tuple<char,char>>,
Args = {int, char}]
The first one doesn't work. The second one does work, and calls
base<std::tuple<char, char>>::out(int, word)
passing in 12 and 'a'. This constructs a std::tuple<char, char>('a'), that is,
std::tuple<char, char>('a', '\0').
If you disagree, please reopen this bug and explain what you think should
happen here and why.</pre>
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