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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - SFINAE in <cmath> not doing its job"
href="http://llvm.org/bugs/show_bug.cgi?id=21083">21083</a>
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<th>Summary</th>
<td>SFINAE in <cmath> not doing its job
</td>
</tr>
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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>Solaris
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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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>unassignedclangbugs@nondot.org
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</tr>
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<th>Reporter</th>
<td>kaballo86@hotmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu, mclow.lists@gmail.com
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<th>Classification</th>
<td>Unclassified
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<p>
<div>
<pre>JordiGH at ##c++ reported a regression in 3.5 and afterwards, that boils down
to this:
#include <cmath>
#include <type_traits>
struct foo : std::true_type // for ADL
{
operator double() const { return 0; }
operator float() const { return 0; }
};
foo pow(foo, int){ return {}; }
int main() {
pow(foo{}, 5); // error: call to '__test' is ambiguous at
type_traits:1195
}
This is due to the `enable_if` in the generic overload of `std::pow` (as well
as others in that header):
template <class _A1, class _A2>
inline _LIBCPP_INLINE_VISIBILITY
typename enable_if
<
is_arithmetic<_A1>::value &&
is_arithmetic<_A2>::value,
typename __promote<_A1, _A2>::type
>::type
pow(_A1 __lcpp_x, _A2 __lcpp_y) _NOEXCEPT
Note that `_promote<_A1, _A2>` is instantiated regardless of whether `_A1` and
`_A2` are arithmetic, which results in the ambiguous overload error.</pre>
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