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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Wrong return type for operator() of "diamond functors""
href="http://llvm.org/bugs/show_bug.cgi?id=22600">22600</a>
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<th>Summary</th>
<td>Wrong return type for operator() of "diamond functors"
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<th>Product</th>
<td>libc++
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>All
</td>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>All Bugs
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>rs2740@gmail.com
</td>
</tr>
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<th>CC</th>
<td>llvmbugs@cs.uiuc.edu, mclow.lists@gmail.com
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<th>Classification</th>
<td>Unclassified
</td>
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<p>
<div>
<pre>Currently, all of the transparent operator functors in <functional> returns
auto. For example:
template <>
struct _LIBCPP_TYPE_VIS_ONLY plus<void>
{
template <class _T1, class _T2>
_LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
auto operator()(_T1&& __t, _T2&& __u) const
{ return _VSTD::forward<_T1>(__t) + _VSTD::forward<_T2>(__u); }
typedef void is_transparent;
};
The standard depicts them as having a trailing return type of decltype(/* the
returned expression */), which is equivalent to returning decltype(auto) except
for SFINAE considerations.</pre>
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