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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Error on SFINAE expression: non-type template argument specializes a template parameter with dependent type."
href="https://llvm.org/bugs/show_bug.cgi?id=27970">27970</a>
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<th>Summary</th>
<td>Error on SFINAE expression: non-type template argument specializes a template parameter with dependent type.
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>3.8
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</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>C++14
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>michele.caini@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Consider the following code:
#include <type_traits>
#include <cstddef>
template<std::size_t N, std::size_t M, std::enable_if_t<not (N>M)>* =
nullptr> // (1)
struct S: public S<N+1, M> { };
template<std::size_t N>
struct S<N, N> { };
int main() {
S<0, 1> c{};
}
It fails to compile with the following error:
8 : error: non-type template argument specializes a template parameter with
dependent type 'std::enable_if_t<!(N > M)> *' (aka 'typename enable_if<!(N >
M), void>::type *')
struct S<N, N> { };
The same code works as expected using the following line instead of (1):
template<std::size_t N, std::size_t M, typename = std::enable_if_t<not
(N>M)>></pre>
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