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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - INVOKE ambiguously implemented (result_of and __invoke)"
href="http://llvm.org/bugs/show_bug.cgi?id=15861">15861</a>
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<th>Summary</th>
<td>INVOKE ambiguously implemented (result_of and __invoke)
</td>
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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>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>All Bugs
</td>
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<th>Assignee</th>
<td>hhinnant@apple.com
</td>
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<th>Reporter</th>
<td>hivemaster@hotmail.de
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
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</tr>
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<th>Classification</th>
<td>Unclassified
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<p>
<div>
<pre>The following example doesn't compile because of the ambiguous overloads of
`__invoke`:
#include <type_traits>
struct wat { wat& operator*() { return *this; } void foo(); };
int main(){
using type = std::result_of<decltype(&wat::foo)(wat)>::type;
}
The standard (indirectly) states in 20.8.1 [func.require] p1 that the second
bullet only applies if the first bullet does not, through the restrictions on
the type of `t1`. The same problem appears with member data pointers (bullets 3
and 4).
One possible resolution is to remove the respective overloads from overload
resolution depending on whether the type of `t1` is a type derived from the
class of the member pointer.</pre>
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